Articles | Volume 14, issue 6
https://doi.org/10.5194/gmd-14-4069-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/gmd-14-4069-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
A NEMO-based model of Sargassum distribution in the tropical Atlantic: description of the model and sensitivity analysis (NEMO-Sarg1.0)
LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse,
France
Rachid Benshila
LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse,
France
Léo Berline
Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Université de Toulon, CNRS/INSU, IRD,
MIO UM 110, Campus of Luminy, Marseille, France
Antonin Soulié
LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse,
France
Marie-Hélène Radenac
LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse,
France
Guillaume Morvan
LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse,
France
Frédéric Diaz
Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Université de Toulon, CNRS/INSU, IRD,
MIO UM 110, Campus of Luminy, Marseille, France
deceased
Julio Sheinbaum
CICESE, Ensenada, Mexico
Cristele Chevalier
Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Université de Toulon, CNRS/INSU, IRD,
MIO UM 110, Campus of Luminy, Marseille, France
Thierry Thibaut
Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Université de Toulon, CNRS/INSU, IRD,
MIO UM 110, Campus of Luminy, Marseille, France
Thomas Changeux
Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Université de Toulon, CNRS/INSU, IRD,
MIO UM 110, Campus of Luminy, Marseille, France
Frédéric Menard
Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Université de Toulon, CNRS/INSU, IRD,
MIO UM 110, Campus of Luminy, Marseille, France
Sarah Berthet
CNRM, Université de Toulouse, Météo-France, CNRS,
Toulouse, France
Olivier Aumont
LOCEAN, IRD-IPSL, Paris, France
Christian Ethé
LOCEAN, IRD-IPSL, Paris, France
Pierre Nabat
CNRM, Université de Toulouse, Météo-France, CNRS,
Toulouse, France
Marc Mallet
CNRM, Université de Toulouse, Météo-France, CNRS,
Toulouse, France
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Since 2010, pelagic Sargassum spp. blooms have increased in several tropical Atlantic regions, causing socioeconomic and ecosystem impacts. Offshore structuration of Sargassum by mesoscale dynamics may influence transport and growth. Sargassum stays afloat, constantly interacting with currents, waves, winds, and mesoscale eddies. We find that anticyclones and cyclones effectively trap Sargassum throughout its propagation, with a greater tendency for cyclones to accumulate Sargassum.
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Sarah Tinorua, Cyrielle Denjean, Pierre Nabat, Véronique Pont, Mathilde Arnaud, Thierry Bourrianne, Maria Dias Alves, and Eric Gardrat
Atmos. Meas. Tech., 17, 3897–3915, https://doi.org/10.5194/amt-17-3897-2024, https://doi.org/10.5194/amt-17-3897-2024, 2024
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Fangxuan Ren, Jintai Lin, Chenghao Xu, Jamiu A. Adeniran, Jingxu Wang, Randall V. Martin, Aaron van Donkelaar, Melanie S. Hammer, Larry W. Horowitz, Steven T. Turnock, Naga Oshima, Jie Zhang, Susanne Bauer, Kostas Tsigaridis, Øyvind Seland, Pierre Nabat, David Neubauer, Gary Strand, Twan van Noije, Philippe Le Sager, and Toshihiko Takemura
Geosci. Model Dev., 17, 4821–4836, https://doi.org/10.5194/gmd-17-4821-2024, https://doi.org/10.5194/gmd-17-4821-2024, 2024
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Hanqin Tian, Naiqing Pan, Rona L. Thompson, Josep G. Canadell, Parvadha Suntharalingam, Pierre Regnier, Eric A. Davidson, Michael Prather, Philippe Ciais, Marilena Muntean, Shufen Pan, Wilfried Winiwarter, Sönke Zaehle, Feng Zhou, Robert B. Jackson, Hermann W. Bange, Sarah Berthet, Zihao Bian, Daniele Bianchi, Alexander F. Bouwman, Erik T. Buitenhuis, Geoffrey Dutton, Minpeng Hu, Akihiko Ito, Atul K. Jain, Aurich Jeltsch-Thömmes, Fortunat Joos, Sian Kou-Giesbrecht, Paul B. Krummel, Xin Lan, Angela Landolfi, Ronny Lauerwald, Ya Li, Chaoqun Lu, Taylor Maavara, Manfredi Manizza, Dylan B. Millet, Jens Mühle, Prabir K. Patra, Glen P. Peters, Xiaoyu Qin, Peter Raymond, Laure Resplandy, Judith A. Rosentreter, Hao Shi, Qing Sun, Daniele Tonina, Francesco N. Tubiello, Guido R. van der Werf, Nicolas Vuichard, Junjie Wang, Kelley C. Wells, Luke M. Western, Chris Wilson, Jia Yang, Yuanzhi Yao, Yongfa You, and Qing Zhu
Earth Syst. Sci. Data, 16, 2543–2604, https://doi.org/10.5194/essd-16-2543-2024, https://doi.org/10.5194/essd-16-2543-2024, 2024
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Sylvain Cailleau, Laurent Bessières, Léonel Chiendje, Flavie Dubost, Guillaume Reffray, Jean-Michel Lellouche, Simon van Gennip, Charly Régnier, Marie Drevillon, Marc Tressol, Matthieu Clavier, Julien Temple-Boyer, and Léo Berline
Geosci. Model Dev., 17, 3157–3173, https://doi.org/10.5194/gmd-17-3157-2024, https://doi.org/10.5194/gmd-17-3157-2024, 2024
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Sarah Tinorua, Cyrielle Denjean, Pierre Nabat, Thierry Bourrianne, Véronique Pont, François Gheusi, and Emmanuel Leclerc
Atmos. Chem. Phys., 24, 1801–1824, https://doi.org/10.5194/acp-24-1801-2024, https://doi.org/10.5194/acp-24-1801-2024, 2024
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At a French high-altitude site, where many complex interactions between black carbon (BC), radiation, clouds and snow impact climate, 2 years of refractive BC (rBC) and aerosol optical and microphysical measurements have been made. We observed strong seasonal rBC properties variations, with an enhanced absorption in summer compared to winter. The combination of rBC emission sources, transport pathways, atmospheric dynamics and chemical processes explains the rBC light absorption seasonality.
Fernand Assene, Ariane Koch-Larrouy, Isabelle Dadou, Michel Tchilibou, Guillaume Morvan, Jérôme Chanut, Alex Costa da Silva, Vincent Vantrepotte, Damien Allain, and Trung-Kien Tran
Ocean Sci., 20, 43–67, https://doi.org/10.5194/os-20-43-2024, https://doi.org/10.5194/os-20-43-2024, 2024
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Twin simulations, with and without tides, are used to assess the impact of internal tides (ITs) on ocean temperature off the Amazon mouth at a seasonal scale. We found that in the surface layers, ITs and barotropic tides cause a cooling effect on sea surface temperature, subsequently leading to an increase in the net heat flux between the atmosphere and ocean. Vertical mixing is identified as the primary driver, followed by vertical and horizontal advection.
Alizée Dale, Marion Gehlen, Douglas W. R. Wallace, Germain Bénard, Christian Éthé, and Elena Alekseenko
EGUsphere, https://doi.org/10.5194/egusphere-2023-2538, https://doi.org/10.5194/egusphere-2023-2538, 2023
Preprint archived
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Diatom, which is at the base of a productive food chain that supports valuable fisheries, dominates the total primary production of the Labrador Sea (LS). The synthesis of biogenic silica frustules makes them peculiar among phytoplankton but also dependent on dissolved silicate (DSi). Regular oceanographic surveys show declining DSi concentrations since the mid-1990s. With a model-based approach, we show that weakening deep winter convection was the proximate cause of DSi decline in the LS.
Sofie Vranken, Marine Robuchon, Stefanie Dekeyzer, Ignacio Bárbara, Inka Bartsch, Aurélie Blanfuné, Charles-François Boudouresque, Wim Decock, Christophe Destombe, Bruno de Reviers, Pilar Díaz-Tapia, Anne Herbst, Romain Julliard, Rolf Karez, Priit Kersen, Stacy A. Krueger-Hadfield, Ralph Kuhlenkamp, Akira F. Peters, Viviana Peña, Cristina Piñeiro-Corbeira, Fabio Rindi, Florence Rousseau, Jan Rueness, Hendrik Schubert, Kjersti Sjøtun, Marta Sansón, Dan Smale, Thierry Thibaut, Myriam Valero, Leen Vandepitte, Bart Vanhoorne, Alba Vergés, Marc Verlaque, Christophe Vieira, Line Le Gall, Frederik Leliaert, and Olivier De Clerck
Earth Syst. Sci. Data, 15, 2711–2754, https://doi.org/10.5194/essd-15-2711-2023, https://doi.org/10.5194/essd-15-2711-2023, 2023
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We present AlgaeTraits, a high-quality seaweed trait database. The data are structured within the framework of WoRMS and are supported by an expert editor community. With 45 175 trait records for 21 prioritised biological and ecological traits, and a taxonomic coverage of 1 745 European species, AlgaeTraits significantly advances previous efforts to provide standardised seaweed trait data. AlgaeTraits will serve as a foundation for future research on diversity and evolution of seaweeds.
Katherine Hutchinson, Julie Deshayes, Christian Éthé, Clément Rousset, Casimir de Lavergne, Martin Vancoppenolle, Nicolas C. Jourdain, and Pierre Mathiot
Geosci. Model Dev., 16, 3629–3650, https://doi.org/10.5194/gmd-16-3629-2023, https://doi.org/10.5194/gmd-16-3629-2023, 2023
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Bottom Water constitutes the lower half of the ocean’s overturning system and is primarily formed in the Weddell and Ross Sea in the Antarctic due to interactions between the atmosphere, ocean, sea ice and ice shelves. Here we use a global ocean 1° resolution model with explicit representation of the three large ice shelves important for the formation of the parent waters of Bottom Water. We find doing so reduces salt biases, improves water mass realism and gives realistic ice shelf melt rates.
Peter Brandt, Gaël Alory, Founi Mesmin Awo, Marcus Dengler, Sandrine Djakouré, Rodrigue Anicet Imbol Koungue, Julien Jouanno, Mareike Körner, Marisa Roch, and Mathieu Rouault
Ocean Sci., 19, 581–601, https://doi.org/10.5194/os-19-581-2023, https://doi.org/10.5194/os-19-581-2023, 2023
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Tropical upwelling systems are among the most productive ecosystems globally. The tropical Atlantic upwelling undergoes a strong seasonal cycle that is forced by the wind. Local wind-driven upwelling and remote effects, particularly via the propagation of equatorial and coastal trapped waves, lead to an upward and downward movement of the nitracline. Turbulent mixing results in upward supply of nutrients. Here, we review the different physical processes responsible for biological productivity.
Roy Dorgeless Ngakala, Gaël Alory, Casimir Yélognissè Da-Allada, Olivia Estelle Kom, Julien Jouanno, Willi Rath, and Ezinvi Baloïtcha
Ocean Sci., 19, 535–558, https://doi.org/10.5194/os-19-535-2023, https://doi.org/10.5194/os-19-535-2023, 2023
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Surface heat flux is the main driver of the heat budget in the Senegal, Angola, and Benguela regions but not in the equatorial region. In the Senegal and Benguela regions, freshwater flux governs the salt budget, while in equatorial and Angola regions, oceanic processes are the main drivers. Results from numerical simulation show the important role of mesoscale advection for temperature and salinity variations in the mixed layer. Nonlinear processes unresolved by observations play a key role.
José Gerardo Quintanilla, Juan Carlos Herguera, and Julio Sheinbaum
EGUsphere, https://doi.org/10.5194/egusphere-2023-751, https://doi.org/10.5194/egusphere-2023-751, 2023
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The reduction of the oxygen concentration in the ocean interior is a worrisome global trend that can be harmful for the marine life. This study presents evidence that the central Gulf of Mexico waters at depths between 200 to 800 m has been affected by an oxygen reduction trend that might be aggravating under climate change. We show evidence that link this oxygen reduction to a decrease in the volume of water transported from the Caribbean in to the Gulf of Mexico via enormous ocean gyres.
Sarah Berthet, Julien Jouanno, Roland Séférian, Marion Gehlen, and William Llovel
Earth Syst. Dynam., 14, 399–412, https://doi.org/10.5194/esd-14-399-2023, https://doi.org/10.5194/esd-14-399-2023, 2023
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Phytoplankton absorbs the solar radiation entering the ocean surface and contributes to keeping the associated energy in surface waters. This natural effect is either not represented in the ocean component of climate models or its representation is simplified. An incomplete representation of this biophysical interaction affects the way climate models simulate ocean warming, which leads to uncertainties in projections of oceanic emissions of an important greenhouse gas (nitrous oxide).
Ian Chang, Lan Gao, Connor J. Flynn, Yohei Shinozuka, Sarah J. Doherty, Michael S. Diamond, Karla M. Longo, Gonzalo A. Ferrada, Gregory R. Carmichael, Patricia Castellanos, Arlindo M. da Silva, Pablo E. Saide, Calvin Howes, Zhixin Xue, Marc Mallet, Ravi Govindaraju, Qiaoqiao Wang, Yafang Cheng, Yan Feng, Sharon P. Burton, Richard A. Ferrare, Samuel E. LeBlanc, Meloë S. Kacenelenbogen, Kristina Pistone, Michal Segal-Rozenhaimer, Kerry G. Meyer, Ju-Mee Ryoo, Leonhard Pfister, Adeyemi A. Adebiyi, Robert Wood, Paquita Zuidema, Sundar A. Christopher, and Jens Redemann
Atmos. Chem. Phys., 23, 4283–4309, https://doi.org/10.5194/acp-23-4283-2023, https://doi.org/10.5194/acp-23-4283-2023, 2023
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Abundant aerosols are present above low-level liquid clouds over the southeastern Atlantic during late austral spring. The model simulation differences in the proportion of aerosol residing in the planetary boundary layer and in the free troposphere can greatly affect the regional aerosol radiative effects. This study examines the aerosol loading and fractional aerosol loading in the free troposphere among various models and evaluates them against measurements from the NASA ORACLES campaign.
Alban Planchat, Lester Kwiatkowski, Laurent Bopp, Olivier Torres, James R. Christian, Momme Butenschön, Tomas Lovato, Roland Séférian, Matthew A. Chamberlain, Olivier Aumont, Michio Watanabe, Akitomo Yamamoto, Andrew Yool, Tatiana Ilyina, Hiroyuki Tsujino, Kristen M. Krumhardt, Jörg Schwinger, Jerry Tjiputra, John P. Dunne, and Charles Stock
Biogeosciences, 20, 1195–1257, https://doi.org/10.5194/bg-20-1195-2023, https://doi.org/10.5194/bg-20-1195-2023, 2023
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Ocean alkalinity is critical to the uptake of atmospheric carbon and acidification in surface waters. We review the representation of alkalinity and the associated calcium carbonate cycle in Earth system models. While many parameterizations remain present in the latest generation of models, there is a general improvement in the simulated alkalinity distribution. This improvement is related to an increase in the export of biotic calcium carbonate, which closer resembles observations.
Corentin Clerc, Laurent Bopp, Fabio Benedetti, Meike Vogt, and Olivier Aumont
Biogeosciences, 20, 869–895, https://doi.org/10.5194/bg-20-869-2023, https://doi.org/10.5194/bg-20-869-2023, 2023
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Gelatinous zooplankton play a key role in the ocean carbon cycle. In particular, pelagic tunicates, which feed on a wide size range of prey, produce rapidly sinking detritus. Thus, they efficiently transfer carbon from the surface to the depths. Consequently, we added these organisms to a marine biogeochemical model (PISCES-v2) and evaluated their impact on the global carbon cycle. We found that they contribute significantly to carbon export and that this contribution increases with depth.
Pierre Henry, M. Sinan Özeren, Nurettin Yakupoğlu, Ziyadin Çakir, Emmanuel de Saint-Léger, Olivier Desprez de Gésincourt, Anders Tengberg, Cristele Chevalier, Christos Papoutsellis, Nazmi Postacıoğlu, Uğur Dogan, Hayrullah Karabulut, Gülsen Uçarkuş, and M. Namık Çağatay
Nat. Hazards Earth Syst. Sci., 22, 3939–3956, https://doi.org/10.5194/nhess-22-3939-2022, https://doi.org/10.5194/nhess-22-3939-2022, 2022
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Seafloor instruments at the bottom of the Sea of Marmara recorded disturbances caused by earthquakes, addressing the minimum magnitude that may be recorded in the sediment. A magnitude 4.7 earthquake caused turbidity but little current. A magnitude 5.8 earthquake caused a mudflow and strong currents that spread sediment on the seafloor over several kilometers. However, most known earthquake deposits in the Sea of Marmara spread over larger zones and should correspond to larger earthquakes.
Michel Tchilibou, Ariane Koch-Larrouy, Simon Barbot, Florent Lyard, Yves Morel, Julien Jouanno, and Rosemary Morrow
Ocean Sci., 18, 1591–1618, https://doi.org/10.5194/os-18-1591-2022, https://doi.org/10.5194/os-18-1591-2022, 2022
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This high-resolution model-based study investigates the variability in the generation, propagation, and sea height signature (SSH) of the internal tide off the Amazon shelf during two contrasted seasons. ITs propagate further north during the season characterized by weak currents and mesoscale eddies and a shallow and strong pycnocline. IT imprints on SSH dominate those of the geostrophic motion for horizontal scales below 200 km; moreover, the SSH is mainly incoherent below 70 km.
Yona Silvy, Clément Rousset, Eric Guilyardi, Jean-Baptiste Sallée, Juliette Mignot, Christian Ethé, and Gurvan Madec
Geosci. Model Dev., 15, 7683–7713, https://doi.org/10.5194/gmd-15-7683-2022, https://doi.org/10.5194/gmd-15-7683-2022, 2022
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A modeling framework is introduced to understand and decompose the mechanisms causing the ocean temperature, salinity and circulation to change since the pre-industrial period and into 21st century scenarios of global warming. This framework aims to look at the response to changes in the winds and in heat and freshwater exchanges at the ocean interface in global climate models, throughout the 1850–2100 period, to unravel their individual effects on the changing physical structure of the ocean.
Rainer Kiko, Marc Picheral, David Antoine, Marcel Babin, Léo Berline, Tristan Biard, Emmanuel Boss, Peter Brandt, Francois Carlotti, Svenja Christiansen, Laurent Coppola, Leandro de la Cruz, Emilie Diamond-Riquier, Xavier Durrieu de Madron, Amanda Elineau, Gabriel Gorsky, Lionel Guidi, Helena Hauss, Jean-Olivier Irisson, Lee Karp-Boss, Johannes Karstensen, Dong-gyun Kim, Rachel M. Lekanoff, Fabien Lombard, Rubens M. Lopes, Claudie Marec, Andrew M. P. McDonnell, Daniela Niemeyer, Margaux Noyon, Stephanie H. O'Daly, Mark D. Ohman, Jessica L. Pretty, Andreas Rogge, Sarah Searson, Masashi Shibata, Yuji Tanaka, Toste Tanhua, Jan Taucher, Emilia Trudnowska, Jessica S. Turner, Anya Waite, and Lars Stemmann
Earth Syst. Sci. Data, 14, 4315–4337, https://doi.org/10.5194/essd-14-4315-2022, https://doi.org/10.5194/essd-14-4315-2022, 2022
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The term
marine particlescomprises detrital aggregates; fecal pellets; bacterioplankton, phytoplankton and zooplankton; and even fish. Here, we present a global dataset that contains 8805 vertical particle size distribution profiles obtained with Underwater Vision Profiler 5 (UVP5) camera systems. These data are valuable to the scientific community, as they can be used to constrain important biogeochemical processes in the ocean, such as the flux of carbon to the deep sea.
Thomas Drugé, Pierre Nabat, Marc Mallet, Martine Michou, Samuel Rémy, and Oleg Dubovik
Atmos. Chem. Phys., 22, 12167–12205, https://doi.org/10.5194/acp-22-12167-2022, https://doi.org/10.5194/acp-22-12167-2022, 2022
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This study presents the implementation of brown carbon in the atmospheric component of the CNRM global climate model and particularly in its aerosol scheme TACTIC. Several simulations were carried out with this climate model, over the period 2000–2014, to evaluate the model by comparison with different reference datasets (PARASOL-GRASP, OMI-OMAERUVd, MACv2, FMI_SAT, AERONET) and to analyze the brown carbon radiative and climatic effects.
Laurent Bopp, Olivier Aumont, Lester Kwiatkowski, Corentin Clerc, Léonard Dupont, Christian Ethé, Thomas Gorgues, Roland Séférian, and Alessandro Tagliabue
Biogeosciences, 19, 4267–4285, https://doi.org/10.5194/bg-19-4267-2022, https://doi.org/10.5194/bg-19-4267-2022, 2022
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The impact of anthropogenic climate change on the biological production of phytoplankton in the ocean is a cause for concern because its evolution could affect the response of marine ecosystems to climate change. Here, we identify biological N fixation and its response to future climate change as a key process in shaping the future evolution of marine phytoplankton production. Our results show that further study of how this nitrogen fixation responds to environmental change is essential.
Samuel Rémy, Zak Kipling, Vincent Huijnen, Johannes Flemming, Pierre Nabat, Martine Michou, Melanie Ades, Richard Engelen, and Vincent-Henri Peuch
Geosci. Model Dev., 15, 4881–4912, https://doi.org/10.5194/gmd-15-4881-2022, https://doi.org/10.5194/gmd-15-4881-2022, 2022
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This article describes a new version of IFS-AER, the tropospheric aerosol scheme used to provide global aerosol products within the Copernicus Atmosphere Monitoring Service (CAMS) cycle. Several components of the model have been updated, such as the dynamical dust and sea salt aerosol emission schemes. New deposition schemes have also been incorporated but are not yet used operationally. This new version of IFS-AER has been evaluated and shown to have a greater skill than previous versions.
M. Al Najar, Y. El Bennioui, G. Thoumyre, R. Almar, E. W. J. Bergsma, R. Benshila, J.-M. Delvit, and D. G. Wilson
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B3-2022, 9–16, https://doi.org/10.5194/isprs-archives-XLIII-B3-2022-9-2022, https://doi.org/10.5194/isprs-archives-XLIII-B3-2022-9-2022, 2022
Simone Tilmes, Daniele Visioni, Andy Jones, James Haywood, Roland Séférian, Pierre Nabat, Olivier Boucher, Ewa Monica Bednarz, and Ulrike Niemeier
Atmos. Chem. Phys., 22, 4557–4579, https://doi.org/10.5194/acp-22-4557-2022, https://doi.org/10.5194/acp-22-4557-2022, 2022
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This study assesses the impacts of climate interventions, using stratospheric sulfate aerosol and solar dimming on stratospheric ozone, based on three Earth system models with interactive stratospheric chemistry. The climate interventions have been applied to a high emission (baseline) scenario in order to reach global surface temperatures of a medium emission scenario. We find significant increases and decreases in total column ozone, depending on regions and seasons.
Andy Jones, Jim M. Haywood, Adam A. Scaife, Olivier Boucher, Matthew Henry, Ben Kravitz, Thibaut Lurton, Pierre Nabat, Ulrike Niemeier, Roland Séférian, Simone Tilmes, and Daniele Visioni
Atmos. Chem. Phys., 22, 2999–3016, https://doi.org/10.5194/acp-22-2999-2022, https://doi.org/10.5194/acp-22-2999-2022, 2022
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Simulations by six Earth-system models of geoengineering by introducing sulfuric acid aerosols into the tropical stratosphere are compared. A robust impact on the northern wintertime North Atlantic Oscillation is found, exacerbating precipitation reduction over parts of southern Europe. In contrast, the models show no consistency with regard to impacts on the Quasi-Biennial Oscillation, although results do indicate a risk that the oscillation could become locked into a permanent westerly phase.
Martí Galí, Marcus Falls, Hervé Claustre, Olivier Aumont, and Raffaele Bernardello
Biogeosciences, 19, 1245–1275, https://doi.org/10.5194/bg-19-1245-2022, https://doi.org/10.5194/bg-19-1245-2022, 2022
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Part of the organic matter produced by plankton in the upper ocean is exported to the deep ocean. This process, known as the biological carbon pump, is key for the regulation of atmospheric carbon dioxide and global climate. However, the dynamics of organic particles below the upper ocean layer are not well understood. Here we compared the measurements acquired by autonomous robots in the top 1000 m of the ocean to a numerical model, which can help improve future climate projections.
Sabrina P. Cochrane, K. Sebastian Schmidt, Hong Chen, Peter Pilewskie, Scott Kittelman, Jens Redemann, Samuel LeBlanc, Kristina Pistone, Michal Segal Rozenhaimer, Meloë Kacenelenbogen, Yohei Shinozuka, Connor Flynn, Rich Ferrare, Sharon Burton, Chris Hostetler, Marc Mallet, and Paquita Zuidema
Atmos. Meas. Tech., 15, 61–77, https://doi.org/10.5194/amt-15-61-2022, https://doi.org/10.5194/amt-15-61-2022, 2022
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This work presents heating rates derived from aircraft observations from the 2016 and 2017 field campaigns of ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS). We separate the total heating rates into aerosol and gas (primarily water vapor) absorption and explore some of the co-variability of heating rate profiles and their primary drivers, leading to the development of a new concept: the heating rate efficiency (HRE; the heating rate per unit aerosol extinction).
Sarah J. Doherty, Pablo E. Saide, Paquita Zuidema, Yohei Shinozuka, Gonzalo A. Ferrada, Hamish Gordon, Marc Mallet, Kerry Meyer, David Painemal, Steven G. Howell, Steffen Freitag, Amie Dobracki, James R. Podolske, Sharon P. Burton, Richard A. Ferrare, Calvin Howes, Pierre Nabat, Gregory R. Carmichael, Arlindo da Silva, Kristina Pistone, Ian Chang, Lan Gao, Robert Wood, and Jens Redemann
Atmos. Chem. Phys., 22, 1–46, https://doi.org/10.5194/acp-22-1-2022, https://doi.org/10.5194/acp-22-1-2022, 2022
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Between July and October, biomass burning smoke is advected over the southeastern Atlantic Ocean, leading to climate forcing. Model calculations of forcing by this plume vary significantly in both magnitude and sign. This paper compares aerosol and cloud properties observed during three NASA ORACLES field campaigns to the same in four models. It quantifies modeled biases in properties key to aerosol direct radiative forcing and evaluates how these biases propagate to biases in forcing.
Léo Berline, Andrea Michelangelo Doglioli, Anne Petrenko, Stéphanie Barrillon, Boris Espinasse, Frederic A. C. Le Moigne, François Simon-Bot, Melilotus Thyssen, and François Carlotti
Biogeosciences, 18, 6377–6392, https://doi.org/10.5194/bg-18-6377-2021, https://doi.org/10.5194/bg-18-6377-2021, 2021
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While the Ionian Sea is considered a nutrient-depleted and low-phytoplankton biomass area, it is a crossroad for water mass circulation. In the central Ionian Sea, we observed a strong contrast in particle distribution across a ~100 km long transect. Using remote sensing and Lagrangian simulations, we suggest that this contrast finds its origin in the long-distance transport of particles from the north, west and east of the Ionian Sea, where phytoplankton production was more intense.
Pierre Damien, Julio Sheinbaum, Orens Pasqueron de Fommervault, Julien Jouanno, Lorena Linacre, and Olaf Duteil
Biogeosciences, 18, 4281–4303, https://doi.org/10.5194/bg-18-4281-2021, https://doi.org/10.5194/bg-18-4281-2021, 2021
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The Gulf of Mexico deep waters are relatively poor in phytoplankton biomass due to low levels of nutrients in the upper layers. Using modeling techniques, we find that the long-living anticyclonic Loop Current eddies that are shed episodically from the Yucatan Channel strongly shape the distribution of phytoplankton and, more importantly, stimulate their growth. This results from the contribution of multiple mechanisms of physical–biogeochemical interactions discussed in this study.
Ramiro Checa-Garcia, Yves Balkanski, Samuel Albani, Tommi Bergman, Ken Carslaw, Anne Cozic, Chris Dearden, Beatrice Marticorena, Martine Michou, Twan van Noije, Pierre Nabat, Fiona M. O'Connor, Dirk Olivié, Joseph M. Prospero, Philippe Le Sager, Michael Schulz, and Catherine Scott
Atmos. Chem. Phys., 21, 10295–10335, https://doi.org/10.5194/acp-21-10295-2021, https://doi.org/10.5194/acp-21-10295-2021, 2021
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Thousands of tons of dust are emitted into the atmosphere every year, producing important impacts on the Earth system. However, current global climate models are not yet able to reproduce dust emissions, transport and depositions with the desirable accuracy. Our study analyses five different Earth system models to report aspects to be improved to reproduce better available observations, increase the consistency between models and therefore decrease the current uncertainties.
Daniele Visioni, Douglas G. MacMartin, Ben Kravitz, Olivier Boucher, Andy Jones, Thibaut Lurton, Michou Martine, Michael J. Mills, Pierre Nabat, Ulrike Niemeier, Roland Séférian, and Simone Tilmes
Atmos. Chem. Phys., 21, 10039–10063, https://doi.org/10.5194/acp-21-10039-2021, https://doi.org/10.5194/acp-21-10039-2021, 2021
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A new set of simulations is used to investigate commonalities, differences and sources of uncertainty when simulating the injection of SO2 in the stratosphere in order to mitigate the effects of climate change (solar geoengineering). The models differ in how they simulate the aerosols and how they spread around the stratosphere, resulting in differences in projected regional impacts. Overall, however, the models agree that aerosols have the potential to mitigate the warming produced by GHGs.
Josué Bock, Martine Michou, Pierre Nabat, Manabu Abe, Jane P. Mulcahy, Dirk J. L. Olivié, Jörg Schwinger, Parvadha Suntharalingam, Jerry Tjiputra, Marco van Hulten, Michio Watanabe, Andrew Yool, and Roland Séférian
Biogeosciences, 18, 3823–3860, https://doi.org/10.5194/bg-18-3823-2021, https://doi.org/10.5194/bg-18-3823-2021, 2021
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In this study we analyse surface ocean dimethylsulfide (DMS) concentration and flux to the atmosphere from four CMIP6 Earth system models over the historical and ssp585 simulations.
Our analysis of contemporary (1980–2009) climatologies shows that models better reproduce observations in mid to high latitudes. The models disagree on the sign of the trend of the global DMS flux from 1980 onwards. The models agree on a positive trend of DMS over polar latitudes following sea-ice retreat dynamics.
Thomas Drugé, Pierre Nabat, Marc Mallet, and Samuel Somot
Atmos. Chem. Phys., 21, 7639–7669, https://doi.org/10.5194/acp-21-7639-2021, https://doi.org/10.5194/acp-21-7639-2021, 2021
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This study presents the surface mass concentration and AOD evolution of various aerosols over the Euro-Mediterranean region between the end of the 20th century and the mid-21st century. This study also describes the part of the expected climate change over the Euro-Mediterranean region that can be explained by the evolution of these different aerosols.
James Keeble, Birgit Hassler, Antara Banerjee, Ramiro Checa-Garcia, Gabriel Chiodo, Sean Davis, Veronika Eyring, Paul T. Griffiths, Olaf Morgenstern, Peer Nowack, Guang Zeng, Jiankai Zhang, Greg Bodeker, Susannah Burrows, Philip Cameron-Smith, David Cugnet, Christopher Danek, Makoto Deushi, Larry W. Horowitz, Anne Kubin, Lijuan Li, Gerrit Lohmann, Martine Michou, Michael J. Mills, Pierre Nabat, Dirk Olivié, Sungsu Park, Øyvind Seland, Jens Stoll, Karl-Hermann Wieners, and Tongwen Wu
Atmos. Chem. Phys., 21, 5015–5061, https://doi.org/10.5194/acp-21-5015-2021, https://doi.org/10.5194/acp-21-5015-2021, 2021
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Stratospheric ozone and water vapour are key components of the Earth system; changes to both have important impacts on global and regional climate. We evaluate changes to these species from 1850 to 2100 in the new generation of CMIP6 models. There is good agreement between the multi-model mean and observations, although there is substantial variation between the individual models. The future evolution of both ozone and water vapour is strongly dependent on the assumed future emissions scenario.
Ben Kravitz, Douglas G. MacMartin, Daniele Visioni, Olivier Boucher, Jason N. S. Cole, Jim Haywood, Andy Jones, Thibaut Lurton, Pierre Nabat, Ulrike Niemeier, Alan Robock, Roland Séférian, and Simone Tilmes
Atmos. Chem. Phys., 21, 4231–4247, https://doi.org/10.5194/acp-21-4231-2021, https://doi.org/10.5194/acp-21-4231-2021, 2021
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This study investigates multi-model response to idealized geoengineering (high CO2 with solar reduction) across two different generations of climate models. We find that, with the exception of a few cases, the results are unchanged between the different generations. This gives us confidence that broad conclusions about the response to idealized geoengineering are robust.
Jens Redemann, Robert Wood, Paquita Zuidema, Sarah J. Doherty, Bernadette Luna, Samuel E. LeBlanc, Michael S. Diamond, Yohei Shinozuka, Ian Y. Chang, Rei Ueyama, Leonhard Pfister, Ju-Mee Ryoo, Amie N. Dobracki, Arlindo M. da Silva, Karla M. Longo, Meloë S. Kacenelenbogen, Connor J. Flynn, Kristina Pistone, Nichola M. Knox, Stuart J. Piketh, James M. Haywood, Paola Formenti, Marc Mallet, Philip Stier, Andrew S. Ackerman, Susanne E. Bauer, Ann M. Fridlind, Gregory R. Carmichael, Pablo E. Saide, Gonzalo A. Ferrada, Steven G. Howell, Steffen Freitag, Brian Cairns, Brent N. Holben, Kirk D. Knobelspiesse, Simone Tanelli, Tristan S. L'Ecuyer, Andrew M. Dzambo, Ousmane O. Sy, Greg M. McFarquhar, Michael R. Poellot, Siddhant Gupta, Joseph R. O'Brien, Athanasios Nenes, Mary Kacarab, Jenny P. S. Wong, Jennifer D. Small-Griswold, Kenneth L. Thornhill, David Noone, James R. Podolske, K. Sebastian Schmidt, Peter Pilewskie, Hong Chen, Sabrina P. Cochrane, Arthur J. Sedlacek, Timothy J. Lang, Eric Stith, Michal Segal-Rozenhaimer, Richard A. Ferrare, Sharon P. Burton, Chris A. Hostetler, David J. Diner, Felix C. Seidel, Steven E. Platnick, Jeffrey S. Myers, Kerry G. Meyer, Douglas A. Spangenberg, Hal Maring, and Lan Gao
Atmos. Chem. Phys., 21, 1507–1563, https://doi.org/10.5194/acp-21-1507-2021, https://doi.org/10.5194/acp-21-1507-2021, 2021
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Southern Africa produces significant biomass burning emissions whose impacts on regional and global climate are poorly understood. ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) is a 5-year NASA investigation designed to study the key processes that determine these climate impacts. The main purpose of this paper is to familiarize the broader scientific community with the ORACLES project, the dataset it produced, and the most important initial findings.
Gillian Thornhill, William Collins, Dirk Olivié, Ragnhild B. Skeie, Alex Archibald, Susanne Bauer, Ramiro Checa-Garcia, Stephanie Fiedler, Gerd Folberth, Ada Gjermundsen, Larry Horowitz, Jean-Francois Lamarque, Martine Michou, Jane Mulcahy, Pierre Nabat, Vaishali Naik, Fiona M. O'Connor, Fabien Paulot, Michael Schulz, Catherine E. Scott, Roland Séférian, Chris Smith, Toshihiko Takemura, Simone Tilmes, Kostas Tsigaridis, and James Weber
Atmos. Chem. Phys., 21, 1105–1126, https://doi.org/10.5194/acp-21-1105-2021, https://doi.org/10.5194/acp-21-1105-2021, 2021
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We find that increased temperatures affect aerosols and reactive gases by changing natural emissions and their rates of removal from the atmosphere. Changing the composition of these species in the atmosphere affects the radiative budget of the climate system and therefore amplifies or dampens the climate response of climate models of the Earth system. This study found that the largest effect is a dampening of climate change as warmer temperatures increase the emissions of cooling aerosols.
Gillian D. Thornhill, William J. Collins, Ryan J. Kramer, Dirk Olivié, Ragnhild B. Skeie, Fiona M. O'Connor, Nathan Luke Abraham, Ramiro Checa-Garcia, Susanne E. Bauer, Makoto Deushi, Louisa K. Emmons, Piers M. Forster, Larry W. Horowitz, Ben Johnson, James Keeble, Jean-Francois Lamarque, Martine Michou, Michael J. Mills, Jane P. Mulcahy, Gunnar Myhre, Pierre Nabat, Vaishali Naik, Naga Oshima, Michael Schulz, Christopher J. Smith, Toshihiko Takemura, Simone Tilmes, Tongwen Wu, Guang Zeng, and Jie Zhang
Atmos. Chem. Phys., 21, 853–874, https://doi.org/10.5194/acp-21-853-2021, https://doi.org/10.5194/acp-21-853-2021, 2021
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This paper is a study of how different constituents in the atmosphere, such as aerosols and gases like methane and ozone, affect the energy balance in the atmosphere. Different climate models were run using the same inputs to allow an easy comparison of the results and to understand where the models differ. We found the effect of aerosols is to reduce warming in the atmosphere, but this effect varies between models. Reactions between gases are also important in affecting climate.
Katixa Lajaunie-Salla, Frédéric Diaz, Cathy Wimart-Rousseau, Thibaut Wagener, Dominique Lefèvre, Christophe Yohia, Irène Xueref-Remy, Brian Nathan, Alexandre Armengaud, and Christel Pinazo
Geosci. Model Dev., 14, 295–321, https://doi.org/10.5194/gmd-14-295-2021, https://doi.org/10.5194/gmd-14-295-2021, 2021
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A biogeochemical model of planktonic food webs including a carbonate balance module is applied in the Bay of Marseille (France) to represent the carbon marine cycle expected to change in the future owing to significant increases in anthropogenic emissions of CO2. The model correctly simulates the ranges and seasonal dynamics of most variables of the carbonate system (pH). This study shows that external physical forcings have an important impact on the carbonate equilibrium in this coastal area.
Kine Onsum Moseid, Michael Schulz, Trude Storelvmo, Ingeborg Rian Julsrud, Dirk Olivié, Pierre Nabat, Martin Wild, Jason N. S. Cole, Toshihiko Takemura, Naga Oshima, Susanne E. Bauer, and Guillaume Gastineau
Atmos. Chem. Phys., 20, 16023–16040, https://doi.org/10.5194/acp-20-16023-2020, https://doi.org/10.5194/acp-20-16023-2020, 2020
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In this study we compare solar radiation at the surface from observations and Earth system models from 1961 to 2014. We find that the models do not reproduce the so-called
global dimmingas found in observations. Only model experiments with anthropogenic aerosol emissions display any dimming at all. The discrepancies between observations and models are largest in China, which we suggest is in part due to erroneous aerosol precursor emission inventories in the emission dataset used for CMIP6.
François Tuzet, Marie Dumont, Ghislain Picard, Maxim Lamare, Didier Voisin, Pierre Nabat, Mathieu Lafaysse, Fanny Larue, Jesus Revuelto, and Laurent Arnaud
The Cryosphere, 14, 4553–4579, https://doi.org/10.5194/tc-14-4553-2020, https://doi.org/10.5194/tc-14-4553-2020, 2020
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This study presents a field dataset collected over 30 d from two snow seasons at a Col du Lautaret site (French Alps). The dataset compares different measurements or estimates of light-absorbing particle (LAP) concentrations in snow, highlighting a gap in the current understanding of the measurement of these quantities. An ensemble snowpack model is then evaluated for this dataset estimating that LAPs shorten each snow season by around 10 d despite contrasting meteorological conditions.
Steven T. Turnock, Robert J. Allen, Martin Andrews, Susanne E. Bauer, Makoto Deushi, Louisa Emmons, Peter Good, Larry Horowitz, Jasmin G. John, Martine Michou, Pierre Nabat, Vaishali Naik, David Neubauer, Fiona M. O'Connor, Dirk Olivié, Naga Oshima, Michael Schulz, Alistair Sellar, Sungbo Shim, Toshihiko Takemura, Simone Tilmes, Kostas Tsigaridis, Tongwen Wu, and Jie Zhang
Atmos. Chem. Phys., 20, 14547–14579, https://doi.org/10.5194/acp-20-14547-2020, https://doi.org/10.5194/acp-20-14547-2020, 2020
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A first assessment is made of the historical and future changes in air pollutants from models participating in the 6th Coupled Model Intercomparison Project (CMIP6). Substantial benefits to future air quality can be achieved in future scenarios that implement measures to mitigate climate and involve reductions in air pollutant emissions, particularly methane. However, important differences are shown between models in the future regional projection of air pollutants under the same scenario.
Cécile Guieu, Fabrizio D'Ortenzio, François Dulac, Vincent Taillandier, Andrea Doglioli, Anne Petrenko, Stéphanie Barrillon, Marc Mallet, Pierre Nabat, and Karine Desboeufs
Biogeosciences, 17, 5563–5585, https://doi.org/10.5194/bg-17-5563-2020, https://doi.org/10.5194/bg-17-5563-2020, 2020
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We describe here the objectives and strategy of the PEACETIME project and cruise, dedicated to dust deposition and its impacts in the Mediterranean Sea. Our strategy to go a step further forward than in previous approaches in understanding these impacts by catching a real deposition event at sea is detailed. We summarize the work performed at sea, the type of data acquired and their valorization in the papers published in the special issue.
Clément Bricaud, Julien Le Sommer, Gurvan Madec, Christophe Calone, Julie Deshayes, Christian Ethe, Jérôme Chanut, and Marina Levy
Geosci. Model Dev., 13, 5465–5483, https://doi.org/10.5194/gmd-13-5465-2020, https://doi.org/10.5194/gmd-13-5465-2020, 2020
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In order to reduce the cost of ocean biogeochemical models, a multi-grid approach where ocean dynamics and tracer transport are computed with different spatial resolution has been developed in the NEMO v3.6 OGCM. Different experiments confirm that the spatial resolution of hydrodynamical fields can be coarsened without significantly affecting the resolved passive tracer fields. This approach leads to a factor of 7 reduction of the overhead associated with running a full biogeochemical model.
Marc Mallet, Fabien Solmon, Pierre Nabat, Nellie Elguindi, Fabien Waquet, Dominique Bouniol, Andrew Mark Sayer, Kerry Meyer, Romain Roehrig, Martine Michou, Paquita Zuidema, Cyrille Flamant, Jens Redemann, and Paola Formenti
Atmos. Chem. Phys., 20, 13191–13216, https://doi.org/10.5194/acp-20-13191-2020, https://doi.org/10.5194/acp-20-13191-2020, 2020
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This paper presents numerical simulations using two regional climate models to study the impact of biomass fire plumes from central Africa on the radiative balance of this region. The results indicate that biomass fires can either warm the regional climate when they are located above low clouds or cool it when they are located above land. They can also alter sea and land surface temperatures by decreasing solar radiation at the surface. Finally, they can also modify the atmospheric dynamics.
Julien Jouanno and Xavier Capet
Ocean Sci., 16, 1207–1223, https://doi.org/10.5194/os-16-1207-2020, https://doi.org/10.5194/os-16-1207-2020, 2020
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The dynamical balance of the Antarctic Circumpolar Current and its implications on the functioning of the world ocean are not fully understood and poorly represented in global circulation models. In this study, the sensitivities of an idealized Southern Ocean (SO) storm track are explored with a set of eddy-rich numerical simulations. We show that the classical partition between barotropic and baroclinic modes is sensitive to current–topography interactions in the mesoscale range of 10–100 km.
Yohei Shinozuka, Pablo E. Saide, Gonzalo A. Ferrada, Sharon P. Burton, Richard Ferrare, Sarah J. Doherty, Hamish Gordon, Karla Longo, Marc Mallet, Yan Feng, Qiaoqiao Wang, Yafang Cheng, Amie Dobracki, Steffen Freitag, Steven G. Howell, Samuel LeBlanc, Connor Flynn, Michal Segal-Rosenhaimer, Kristina Pistone, James R. Podolske, Eric J. Stith, Joseph Ryan Bennett, Gregory R. Carmichael, Arlindo da Silva, Ravi Govindaraju, Ruby Leung, Yang Zhang, Leonhard Pfister, Ju-Mee Ryoo, Jens Redemann, Robert Wood, and Paquita Zuidema
Atmos. Chem. Phys., 20, 11491–11526, https://doi.org/10.5194/acp-20-11491-2020, https://doi.org/10.5194/acp-20-11491-2020, 2020
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In the southeast Atlantic, well-defined smoke plumes from Africa advect over marine boundary layer cloud decks; both are most extensive around September, when most of the smoke resides in the free troposphere. A framework is put forth for evaluating the performance of a range of global and regional atmospheric composition models against observations made during the NASA ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) airborne mission in September 2016.
Cited articles
Aumont, O. and Bopp, L.: Globalizing results from ocean in- situ iron
fertilization experiments, Global Biogeochem. Cy., 20, GB2017, https://doi.org/10.1029/2005GB002591, 2006.
Aumont, O., Ethé, C., Tagliabue, A., Bopp, L., and Gehlen, M.: PISCES-v2: an ocean biogeochemical model for carbon and ecosystem studies, Geosci. Model Dev., 8, 2465–2513, https://doi.org/10.5194/gmd-8-2465-2015, 2015.
Axell, L. B.: Wind-driven internal waves and Langmuir circulations in a
numerical ocean model of the southern Baltic Sea, J. Geophys.
Res.-Oceans, 107, 3204, https://doi.org/10.1029/2001JC000922, 2002.
Awo F. M., Alory, G., Da-Allada, C., Delcroix, T., Jouanno, J., and
Baloïtch, E.: Sea Surface Salinity signature of the tropical Atlantic
interannual climatic modes, J. Geophys.
Res., 123, 7420–7437, https://doi.org/10.1029/2018JC013837, 2018.
Baker, P., Minzlaff, U., Schoenle, A., Schwabe, E., Hohlfeld, M., Jeuck, A, Brenke, N., Prausse, D., Rothenbeck, M., Brix, S., Frutos, I., Jörger, K. M., Neusser, T. P., Koppelmann, R., Devey, C., Brandt, A., and Arndt, H.: Potential contribution of surface-dwelling Sargassum
algae to deep-sea ecosystems in the southern North Atlantic, Deep-Sea
Res. Pt. II, 148, 21–34, 2018.
Bendoricchio, G., Coffaro, G., and De Marchi, C.: A trophic model for Ulva
rigida in the Lagoon of Venice, Ecol. Model., 75, 485–496, 1994.
Berline, L., Ody, A., Jouanno, J., Chevalier, C., André, J. M., Thibaut,
T., and Ménard, F.: Hindcasting the 2017 dispersal of Sargassum algae in
the Tropical North Atlantic, Mar. Pollut. Bull., 158, 111431, https://doi.org/10.1016/j.marpolbul.2020.111431, 2020.
Bergamasco, A. and Zago, C.: Exploring the nitrogen cycle and macroalgae
dynamics in the lagoon of Venice using a multibox model, Estuar. Coast.
Shelf S., 48, 155–175, 1999.
Bernard D., Biabiany, E., Sekkat, N., Chery, R., and Cécé, R.: Massive stranding of pelagic–sargassum seaweeds on the French Antilles coasts: Analysis of observed situations with Operational Mercator global ocean analysis and fore- cast system, 24th Congrès Français de Mécanique, Brest, France, 26–30 August 2019, available at: https://cfm2019.sciencesconf.org/258628/document (last access: 23 September 2020), 2019.
Beron-Vera, F. J. and Miron, P.: A minimal Maxey–Riley model for the drift
of Sargassum rafts, J. Fluid Mech., 904, A8, https://doi.org/10.1017/jfm.2020.666, 2020.
Breivik, Ø., Janssen, P. A., and Bidlot, J. R.: Approximate Stokes drift
profiles in deep water, J. Phys. Oceanogr., 44, 2433–2445,
2014.
Brooks, M. T., Coles, V. J., Hood, R. R., and Gower, J. F.: Factors
controlling the seasonal distribution of pelagic Sargassum, Mar. Ecol.-Prog. Ser., 599, 1–18, 2018.
Brooks, M. T., Coles, V. J., and Coles, W. C.: Inertia influences pelagic
sargassum advection and distribution, Geophys. Res. Lett., 46,
2610–2618, 2019.
Butler, J. N., Morris, B. F., Cadwallader, J., and Stoner, A. W.: Studies of Sargassum and the Sargassum community. Bermuda Biological Station Special Publication 22, Hamilton, Bermuda, 307 pp., 1983.
Carpenter, E. J.: Nitrogen fixation by a blue-green epiphyte on pelagic
Sargassum, Science, 178, 1207–1209, 1972.
Carpenter, E. J. and Cox, J. L.: Production of pelagic Sargassum and a
blue-green epiphyte in the western Sargasso Sea 1, Limnol.
Oceanogr., 19, 429–436, 1974.
Decharme, B., Delire, C., Minvielle, M., Colin, J., Vergnes, J. P., Alias,
A., Saint-Martin, D., Séférian, R., Sénési, S., and Voldoire, A.: Recent
changes in the ISBA-CTRIP land surface system for use in the CNRM-CM6
climate model and in global off-line hydrological applications, J.
Adv. Model. Earth Sy., 11, 1207–1252, 2019.
Deutsch, J. L. and Deutsch, C. V.: Latin hypercube sampling with
multidimensional uniformity, J. Stat. Plan.
Infer., 142, 763–772, 2012.
Drugé, T., Nabat, P., Mallet, M., and Somot, S.: Model simulation of ammonium and nitrate aerosols distribution in the Euro-Mediterranean region and their radiative and climatic effects over 1979–2016, Atmos. Chem. Phys., 19, 3707–3731, https://doi.org/10.5194/acp-19-3707-2019, 2019.
Dussin, R., Barnier, B., and Brodeau, L.: The making of Drakkar forcing set
DFS5, DRAKKAR/MyOcean Report 01-04-16, LGGE, Grenoble, France, 2016.
Garcia, H. E., Locarnini, R. A., Boyer, T. P., Antonov, J. I., Zweng, M. M.,
Baranova, O. K., and Johnson, D. R.: World Ocean Atlas 2009, Volume 4:
Nutrients (phosphate, nitrate, silicate), S. Levitus, Ed. NOAA Atlas
NESDIS 71, U.S. Government Printing Office, Washington, D.C., 398 pp., 2010.
García-Sánchez, M., Graham, C., Vera, E., Escalante-Mancera, E.,
Álvarez-Filip, L., and van Tussenbroek, B. I.: Temporal changes in the
composition and biomass of beached pelagic Sargassum species in the Mexican
Caribbean, Aquat. Bot., 167, 103275, https://doi.org/10.1016/j.aquabot.2020.103275, 2020.
Giffard, P., Llovel, W., Jouanno, J., Morvan, G., and Decharme, B.:
Contribution of the Amazon River discharge to regional sea level in the
tropical Atlantic Ocean, Water, 11, 2348, https://doi.org/10.3390/w11112348, 2019.
Hanisak, M. D.: The nitrogen relationship of marine macroalgae, in: Nitrogen in the Marine Envinroment, edited by:
Carpenter, E. J. and Capone, D. G., Academic
Press, New York, 699–730, 1983.
Hanisak, M. D. and Samuel, M. A.: Growth rates in culture of several
species of Sargassum from Florida, USA, in: Twelfth International Seaweed
Symposium, 399–404, Springer, Dordrecht, 1987.
Hanson, R. B.: Pelagic Sargassum community metabolism: Carbon and nitrogen, J. Exp. Mar. Biol. Ecol., 29, 107–118, 1977.
Hernandez, O., Jouanno, J., and Durand, F.: Do the Amazon and Orinoco river
plumes influence tropical cyclone-induced surface cooling, J.
Geophys. Res.-Oceans, 121, 2119–2141, 2016.
Hernandez, O., Jouanno, J., Echevin, V., and Aumont, A.: Impacts of chlorophyll
concentrations on the Tropical Atlantic Ocean, J. Geophys. Res.-Oceans, 122, 5367–5389, https://doi.org/10.1002/2016JC012330, 2017.
Howard, K. L. and Menzies, R. J.: Distribution and production of Sargassum
in the waters off the Carolina coast, Bot. Mar., 12, 244–254,
1969.
Johns, E. M., Lumpkin, R., Putman, N. F., Smith, R. H., Muller-Karger, F.,
Rueda, D., Hu, C., Wang, M., Brooks, M. T., Gramer, L., and Werner, F. E.: The
establishment of a pelagic Sargassum population in the tropical Atlantic:
biological consequences of a basin-scale long distance dispersal event,
Prog. Oceanogr., 182, 102269, https://doi.org/10.1016/j.pocean.2020.102269, 2020.
Johnson, D. L. and Richardson, P. L.: On the wind-induced sinking of
Sargassum, J. Exp. Mar. Biol. Ecol., 28, 255–267,
https://doi.org/10.1016/0022-0981(77)90095-8, 1977.
Jouanno J. and Benshila R.: Sargassum distribution model based on the NEMO
ocean modelling platform (Version 0.0), Zenodo, https://doi.org/10.5281/zenodo.4275901, 2020.
Jouanno, J., Moquet, J. S., Berline, L., Radenac, M. H., Santini, W.,
Changeux, T., Thibaut, T., Podlejski, W., Menard, F., Martínez, J.M.,
Aumont, O., Sheinbaum, J., Filizola, N., and N'Kaya, G. D. M.: Evolution of
the riverine nutrient export to the Tropical Atlantic over the last 15
years: is there a link with Sargassum proliferation?, Environ. Res.
Lett., 16, 034042, https://doi.org/10.1088/1748-9326/abe11a, 2021.
Kounta, L., Capet, X., Jouanno, J., Kolodziejczyk, N., Sow, B., and Gaye, A. T.: A model perspective on the dynamics of the shadow zone of the eastern tropical North Atlantic – Part 1: the poleward slope currents along West Africa, Ocean Sci., 14, 971–997, https://doi.org/10.5194/os-14-971-2018, 2018.
Kwiatkowski, L., Aumont, O., Bopp, L., and Ciais, P.: The Impact of variable
Phytoplankton Stoichiometry on Projections of primary production, food
quality, and carbon uptake in the global ocean, Global Biogeochem.
Cy., 32, 516–528, 2018.
Langin, K.: Seaweed masses assault Caribbean islands, Science, 360,
1157–1158, 2018.
Langmuir, I.: Surface motion of water induced by wind, Science, 87, 119–123,
1938.
Lapointe, B. E.: Phosphorus-limited photosynthesis and growth of Sargassum
natans and Sargassum fluitans (Phaeophyceae) in the western North
Atlantic, Deep-Sea Res. Pt. A, 33,
391–399, 1986.
Lapointe, B. E.: A comparison of nutrient-limited productivity in Sargassum
natans from neritic vs. oceanic waters of the western North Atlantic Ocean,
Limnol. Oceanogr., 40, 625–633, 1995.
Lapointe, B. E., West, L. E., Sutton, T. T., and Hu, C.: Ryther revisited:
Nutrient excretions by fishes enhance productivity of pelagic Sargassum in
the western North Atlantic Ocean, J. Exp. Mar. Biol. Ecol., 458, 46–56, 2014.
Large, W. G. and Yeager, S.: The global climatology of an interannually
varying air-sea flux data set, Clim. Dynam., 33, 341–364,
https://doi.org/10.1007/s00382-008-0441-3, 2009.
Lehman, J. T., Botkin, D. B., and Likens, G. E.: The assumptions and rationales
of a computer model of phytoplankton population dynamics, Limnol.
Oceanogr., 20, 343–364, 1975.
Louime, C., Fortune, J., and Gervais, G.: Sargassum Invasion of Coastal
Environments: A Growing Concern, Am. J. Environ. Sci., 13, 58–64,
https://doi.org/10.3844/ajessp.2017.58.64, 2017.
Madec, G. and the NEMO team: NEMO ocean engine. Note du Pôle de
modélisation, Institut Pierre-Simon Laplace (IPSL), France,
Vol. 27, 1288–1619, 2016.
Maréchal, J. P., Hellio, C., and Hu, C.: A simple, fast, and reliable
method to predict Sargassum washing ashore in the Lesser Antilles, Remote
Sensing Applications: Society and Environment, 5, 54–63, 2017.
Martins, I. and Marques, J. C.: A model for the growth of opportunistic
macroalgae (Enteromorpha sp.) in tidal estuaries, Estuar. Coast.
Shelf S., 55, 247–257, 2002.
Ménesguen, A., Cugier, P., and Leblond, I.: A new numerical technique for
tracking chemical species in a mul-tisource, coastal ecosystem, applied to
nitrogen causing Ulva blooms in the Bay of Brest (France), Limnol.
Oceanogr., 51, 591–601, 2006.
Michotey, V., Blanfuné, A., Chevalier, C., Garel, M., Diaz, F., Berline,
L., and Changeux, T.: In situ observations and modelling revealed
environmental factors favouring occurrence of Vibrio in microbiome of the
pelagic Sargassum responsible for strandings, Sci. Total
Environ., 748, 141216, https://doi.org/10.1016/j.scitotenv.2020.141216, 2020.
Michou, M., Nabat, P., Saint-Martin, D., Bock, J., Decharme, B., Mallet, M.,
Roehrig, R., Séférian, R., Sénési, S., and Voldoire, A.:
Present-day and historical aerosol and ozone characteristics in CNRM CMIP6
simulations, J. Adv. Model Earth Sy., 12, e2019MS001816, https://doi.org/10.1029/2019MS001816, 2020.
Ody, A., Thibaut, T., Berline, L., Changeux, T., André, J.M., Chevalier, C., Blanfuné, A., Blanchot, J., Ruitton, S., StigerPouvreau, V., Connan, S., Grelet, J., Aurelle, D., Guéné, M., Bataille, H., Bachelier, C., Guillemain, D., Schmidt, N., Fauvelle, V., Guasco, S., and Ménard, F.: From in situ to satellite observations of pelagic Sargassum distribution and aggregation in the tropical North Atlantic Ocean, PLoS One 14, 1–29, https://doi.org/10.1371/journal.pone.0222584, 2019.
Olsen, A., Key, R. M., van Heuven, S., Lauvset, S. K., Velo, A., Lin, X., Schirnick, C., Kozyr, A., Tanhua, T., Hoppema, M., Jutterström, S., Steinfeldt, R., Jeansson, E., Ishii, M., Pérez, F. F., and Suzuki, T.: The Global Ocean Data Analysis Project version 2 (GLODAPv2) – an internally consistent data product for the world ocean, Earth Syst. Sci. Data, 8, 297–323, https://doi.org/10.5194/essd-8-297-2016, 2016.
Oviatt, C. A., Huizenga, K., Rogers, C. S., and Miller, W. J.: What
nutrient sources support anomalous growth and the recent sargassum mass
stranding on Caribbean beaches? A review, Mar. Pollut. Bull., 145,
517–525, 2019.
Oyesiku, O. O. and Egunyomi, A.: Identification and chemical studies of
pelagic masses of Sargassum natans (Linnaeus) Gaillon and S. fluitans
(Borgessen) Borgesen (brown algae), found offshore in Ondo State,
Nigeria, Afr. J. Biotechnol., 13, 1188–1193, https://doi.org/10.5897/AJB2013.12335, 2014.
Perrot, T., Rossi, N., Ménesguen, A., and Dumas, F.: Modelling green
macroalgal blooms on the coasts of Brittany, France to enhance water quality
management, J. Marine Syst., 132, 38–53, 2014.
Prospero, J. M., Barkley, A. E., Gaston, C. J., Gatineau, A., Campos y
Sansano, A., and Panechou, K.: Characterizing and quantifying African dust
transport and deposition to South America: Implications for the phosphorus
budget in the Amazon Basin, Global Biogeochem. Cy., 34, e2020GB006536,
https://doi.org/10.1029/2020GB006536, 2020.
Putman, N. F. and He, R.: Tracking the long-distance dispersal of marine
organisms: sensitivity to ocean model resolution, J. Roy.
Soc. Interf., 10, p. 20120979, 2013.
Putman, N. F., Goni, G. J., Gramer, L. J., Hu, C., Johns, E. M., Trinanes, J., and Wang, M.:
Simulating transport pathways of pelagic Sargassum from the Equatorial
Atlantic into the Caribbean Sea, Prog. Oceanogr., 165, 205–214,
2018.
Putman, N. F., Lumpkin, R., Olascoaga, M. J., Trinanes, J., and Goni, G.
J.: Improving transport predictions of pelagic Sargassum, J.
Exp. Mar. Biol. Ecol., 529, 151398, https://doi.org/10.1016/j.jembe.2020.151398 2020.
Radenac, M.-H., Jouanno, J., Tchamabi, C. C., Awo, M., Bourlès, B., Arnault, S., and Aumont, O.: Physical drivers of the nitrate seasonal variability in the Atlantic cold tongue, Biogeosciences, 17, 529–545, https://doi.org/10.5194/bg-17-529-2020, 2020.
Raut, Y., Morando, M., and Capone, D. G.: Diazotrophic Macroalgal
Associations With Living and Decomposing Sargassum, Front.
Microbiol., 9, p. 3127, https://doi.org/10.3389/fmicb.2018.03127, 2018.
Ren, J. S., Barr, N. G., Scheuer, K., Schiel, D. R., and Zeldis, J.: A
dynamic growth model of macroalgae: application in an estuary recovering
from treated wastewater and earthquake-driven eutrophication, Estuar.
Coast. Shelf S., 148, 59–69, 2014.
Schell, J. M., Goodwin, D. S., and Siuda, A. N.: Recent Sargassum inundation
events in the Caribbean: shipboard observations reveal dominance of a
previously rare form, Oceanography, 28, 8–11, 2015.
Schoener, A. and Rowe, G. T.: Pelagic Sargassum and its presence among the
deep-sea benthos, Deep-Sea Res., 17, 923–925, https://doi.org/10.1016/0011-7471(70)90010-0, 1970.
Séférian, R., Berthet, S., Yool, A., Palmiéri, J., Bopp, L., Tagliabue, A., Kwiatkowski, L., Aumont, O., Christian, J., Dunne, J., Gehlen, M., Ilyina, T., John, J. G., Li, H., Long, M. C., Luo, J. Y., Nakano, H., Romanou, A., Schwinger, J., Stock, C., Santana-Falcón, Y., Takano, Y., Tjiputra, J., Tsujino, H., Watanabe, M., Wu, T., Wu, F., and Yamamoto, A.: Tracking Improvement in Simulated Marine Biogeochemistry Between CMIP5 and CMIP6, Current Climate Change Reports, 6, 95–119, https://doi.org/10.1007/s40641-020-00160-0, 2020.
Sissini, M. N., de Barros Barreto, M. B. B., Széchy, M. T. M., de
Lucena, M. B., Oliveira, M. C., Gower, J., Liu, G., de Oliveira
Bastos, E., Milstein, D., Gusmão, F., and Martinelli-Filho, J. E.: The floating
Sargassum (Phaeophyceae) of the South Atlantic Ocean–likely
scenarios, Phycologia, 56, 321–328, 2017.
Smetacek, V. and Zingone, A.: Green and golden seaweed tides on the
rise, Nature, 504, 84–88, 2013.
Solidoro, C., Pecenik, G., Pastres, R., Franco, D., and Dejak, C.:
Modelling macroalgae (Ulva rigida) in the Venice lagoon: Model structure
identification and first parameters estimation, Ecol.
Model., 94, 191–206, 1997.
Storto, A., Masina, S., Simoncelli, S., Iovino, D., Cipollone, A.,
Drevillon, M., Drillet, Y., von Schuckman, K., Parent, L., Garric, G.,
Greiner, E., Desportes, C., Zuo, H., Balmaseda, M. A., and Peterson, K. A.:
The added value of the multi-system spread information for ocean heat
content and steric sea level investigations in the CMEMS GREP ensemble
reanalysis product, Clim. Dynam., 53, 287,
https://doi.org/10.1007/s00382-018-4585-5, 2018.
Wang, M. and Hu, C.: Mapping and quantifying Sargassum distribution and
coverage in the Central Western Atlantic using MODIS observations, Remote
Sens. Environ., 183, 350–367, 2016.
Wang, M. and Hu, C.: Predicting Sargassum blooms in the Caribbean Sea from
MODIS observations, Geophys. Res. Lett., 44, 3265–3273, 2017.
Wang, M., Hu, C., Cannizzaro, J., English, D., Han, X., Naar, D., Lapointe,
B., Brewton, R., and Hernandez, F.: Remote sensing of Sargassum biomass,
nutrients, and pigments, Geophys. Res. Lett., 45, 12359–12367,
https://doi.org/10.1029/2018GL078858, 2018.
Wang, M., Hu, C., Barnes, B. B., Mitchum, G., Lapointe, B., and Montoya, J.
P.: The great Atlantic Sargassum belt, Science, 365, 83–87, 2019.
Woodcock, A. H.: Winds subsurface pelagic Sargassum and Langmuir
circulations, J. Exp. Mar. Biol. Ecol., 170,
117–125, https://doi.org/10.1016/0022-0981(93)90132-8, 1993.
Zhong, Y., Bracco, A., and Villareal, T. A.: Pattern formation at the ocean
surface: Sargassum distribution and the role of the eddy field, Limnol.
Oceanogr., 2, 12–27, 2012.
Short summary
The tropical Atlantic has been facing a massive proliferation of Sargassum since 2011, with severe environmental and socioeconomic impacts. We developed a modeling framework based on the NEMO ocean model, which integrates transport by currents and waves, and physiology of Sargassum with varying internal nutrient quota, and considers stranding at the coast. Results demonstrate the ability of the model to reproduce and forecast the seasonal cycle and large-scale distribution of Sargassum biomass.
The tropical Atlantic has been facing a massive proliferation of Sargassum since 2011, with...
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