Articles | Volume 14, issue 5
https://doi.org/10.5194/gmd-14-2959-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-14-2959-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Development and technical paper
| 
26 May 2021
Development and technical paper |
| 26 May 2021
| 26 May 2021
A Schwarz iterative method to evaluate ocean–atmosphere coupling schemes: implementation and diagnostics in IPSL-CM6-SW-VLR
Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
Sébastien Nguyen
Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
Pascale Braconnot
Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
Sophie Valcke
CECI, Université de Toulouse, CNRS, CERFACS, Toulouse, France
Florian Lemarié
Univ. Grenoble Alpes, Inria, CNRS, Grenoble INP, LJK, 38000, Grenoble, France
Eric Blayo
Univ. Grenoble Alpes, Inria, CNRS, Grenoble INP, LJK, 38000, Grenoble, France
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Mario C. Acosta, Sergi Palomas, Stella V. Paronuzzi Ticco, Gladys Utrera, Joachim Biercamp, Pierre-Antoine Bretonniere, Reinhard Budich, Miguel Castrillo, Arnaud Caubel, Francisco Doblas-Reyes, Italo Epicoco, Uwe Fladrich, Sylvie Joussaume, Alok Kumar Gupta, Bryan Lawrence, Philippe Le Sager, Grenville Lister, Marie-Pierre Moine, Jean-Christophe Rioual, Sophie Valcke, Niki Zadeh, and Venkatramani Balaji
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Nicholas K.-R. Kevlahan and Florian Lemarié
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WAVETRISK-2.1 is an innovative climate model for the world's oceans. It uses state-of-the-art techniques to change the model's resolution locally, from O(100 km) to O(5 km), as the ocean changes. This dynamic adaptivity makes optimal use of available supercomputer resources, and allows two-dimensional global scales and three-dimensional submesoscales to be captured in the same simulation. WAVETRISK-2.1 is designed to be coupled its companion global atmosphere model, WAVETRISK-1.x.
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Manuscript not accepted for further review
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To reconstruct the paleoenvironmental and chronological context of archaeo/paleontological sites is a key step to understand the evolutionary history of past organisms. Paleoenvironmental proxies often show inconsistencies and age estimations can vary depending on the method used. We show the potential of paleoclimate simulations to address those discrepancies, illustrating the strong potential of our cross-disciplinary approach to refine the context of archaeo/paleontological sites.
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We show that modern concepts of non-equilibrium statistical mechanics can be applied to large-scale environmental fluid dynamics, where fluctuations are not thermal but come from turbulence. The work theorems developed by Jarzynski and Crooks are applied to air–sea interaction. Rather than looking at the average values of thermodynamic variables, their probability density functions are considered, which allows us to replace the inequalities of equilibrium statistical mechanics with equalities.
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A simplified model of the atmospheric boundary layer (ABL) of intermediate complexity between a bulk parameterization and a full three-dimensional atmospheric model has been developed and integrated to the NEMO ocean model.
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Masa Kageyama, Louise C. Sime, Marie Sicard, Maria-Vittoria Guarino, Anne de Vernal, Ruediger Stein, David Schroeder, Irene Malmierca-Vallet, Ayako Abe-Ouchi, Cecilia Bitz, Pascale Braconnot, Esther C. Brady, Jian Cao, Matthew A. Chamberlain, Danny Feltham, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina Morozova, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, Ryouta O'ishi, Silvana Ramos Buarque, David Salas y Melia, Sam Sherriff-Tadano, Julienne Stroeve, Xiaoxu Shi, Bo Sun, Robert A. Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, Weipeng Zheng, and Tilo Ziehn
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Bette L. Otto-Bliesner, Esther C. Brady, Anni Zhao, Chris M. Brierley, Yarrow Axford, Emilie Capron, Aline Govin, Jeremy S. Hoffman, Elizabeth Isaacs, Masa Kageyama, Paolo Scussolini, Polychronis C. Tzedakis, Charles J. R. Williams, Eric Wolff, Ayako Abe-Ouchi, Pascale Braconnot, Silvana Ramos Buarque, Jian Cao, Anne de Vernal, Maria Vittoria Guarino, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina A. Morozova, Kerim H. Nisancioglu, Ryouta O'ishi, David Salas y Mélia, Xiaoxu Shi, Marie Sicard, Louise Sime, Christian Stepanek, Robert Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, and Weipeng Zheng
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Chris M. Brierley, Anni Zhao, Sandy P. Harrison, Pascale Braconnot, Charles J. R. Williams, David J. R. Thornalley, Xiaoxu Shi, Jean-Yves Peterschmitt, Rumi Ohgaito, Darrell S. Kaufman, Masa Kageyama, Julia C. Hargreaves, Michael P. Erb, Julien Emile-Geay, Roberta D'Agostino, Deepak Chandan, Matthieu Carré, Partrick J. Bartlein, Weipeng Zheng, Zhongshi Zhang, Qiong Zhang, Hu Yang, Evgeny M. Volodin, Robert A. Tomas, Cody Routson, W. Richard Peltier, Bette Otto-Bliesner, Polina A. Morozova, Nicholas P. McKay, Gerrit Lohmann, Allegra N. Legrande, Chuncheng Guo, Jian Cao, Esther Brady, James D. Annan, and Ayako Abe-Ouchi
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Josephine R. Brown, Chris M. Brierley, Soon-Il An, Maria-Vittoria Guarino, Samantha Stevenson, Charles J. R. Williams, Qiong Zhang, Anni Zhao, Ayako Abe-Ouchi, Pascale Braconnot, Esther C. Brady, Deepak Chandan, Roberta D'Agostino, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Polina A. Morozova, Rumi Ohgaito, Ryouta O'ishi, Bette L. Otto-Bliesner, W. Richard Peltier, Xiaoxu Shi, Louise Sime, Evgeny M. Volodin, Zhongshi Zhang, and Weipeng Zheng
Clim. Past, 16, 1777–1805, https://doi.org/10.5194/cp-16-1777-2020, https://doi.org/10.5194/cp-16-1777-2020, 2020
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El Niño–Southern Oscillation (ENSO) is the largest source of year-to-year variability in the current climate, but the response of ENSO to past or future changes in climate is uncertain. This study compares the strength and spatial pattern of ENSO in a set of climate model simulations in order to explore how ENSO changes in different climates, including past cold glacial climates and past climates with different seasonal cycles, as well as gradual and abrupt future warming cases.
Cited articles
Balaji, V., Anderson, J., Held, I., Winton, M., Durachta, J., Malyshev, S., and Stouffer, R. J.: The Exchange Grid, in: Parallel Computational Fluid Dynamics 2005, Elsevier, 179–186,
https://doi.org/10.1016/B978-044452206-1/50021-5, 2006. a
Boucher, O., Servonnat, J., Albright, A. L., Aumont, O., Balkanski, Y.,
Bastrikov, V., Bekki, S., Bonnet, R., Bony, S., Bopp, L., Braconnot, P.,
Brockmann, P., Cadule, P., Caubel, A., Cheruy, F., Codron, F., Cozic, A.,
Cugnet, D., D'Andrea, F., Davini, P., Lavergne, C., Denvil, S., Deshayes, J.,
Devilliers, M., Ducharne, A., Dufresne, J., Dupont, E., Éthé, C., Fairhead,
L., Falletti, L., Flavoni, S., Foujols, M., Gardoll, S., Gastineau, G.,
Ghattas, J., Grandpeix, J., Guenet, B., Guez, E., L., Guilyardi, E.,
Guimberteau, M., Hauglustaine, D., Hourdin, F., Idelkadi, A., Joussaume, S.,
Kageyama, M., Khodri, M., Krinner, G., Lebas, N., Levavasseur, G., Lévy, C.,
Li, L., Lott, F., Lurton, T., Luyssaert, S., Madec, G., Madeleine, J.,
Maignan, F., Marchand, M., Marti, O., Mellul, L., Meurdesoif, Y., Mignot, J.,
Musat, I., Ottlé, C., Peylin, P., Planton, Y., Polcher, J., Rio, C.,
Rochetin, N., Rousset, C., Sepulchre, P., Sima, A., Swingedouw, D.,
Thiéblemont, R., Traore, A. K., Vancoppenolle, M., Vial, J., Vialard, J.,
Viovy, N., and Vuichard, N.: Presentation and Evaluation of the
IPSL‐CM6A‐LR Climate Model, J. Adv. Model. Earth Syst., 12, e2019MS002010, https://doi.org/10.1029/2019MS002010, 2020. a, b, c, d
Braconnot, P., Marti, O., and Joussaume, S.: Adjustment and feedbacks in a
global coupled ocean-atmosphere model, Clim. Dynam., 13, 507–519,
https://doi.org/10.1007/s003820050179, 7-8, 1997. a
Connors, J. M. and Ganis, B.: Stability of algorithms for a two domain natural convection problem and observed model uncertainty, Comput. Geosci., 15, 509–527, https://doi.org/10.1007/s10596-010-9219-x, 2011. a
Ducoudré, N. I., Laval, K., and Perrier, A.: SECHIBA, a New Set of
Parameterizations of the Hydrologic Exchanges at the
Land-Atmosphere Interface within the LMD Atmospheric General
Circulation Model, J. Climate, 6, 248–273,
https://doi.org/10.1175/1520-0442(1993)006<0248:SANSOP>2.0.CO;2, 1993. a, b, c
Dufresne, J.-L., Foujols, M.-A., Denvil, S., Caubel, A., Marti, O., Aumont, O.,
Balkanski, Y., Bekki, S., Bellenger, H., Benshila, R., Bony, S., Bopp, L.,
Braconnot, P., Brockmann, P., Cadule, P., Cheruy, F., Codron, F., Cozic, A.,
Cugnet, D., Noblet, N., Duvel, J.-P., Ethé, C., Fairhead, L., Fichefet, T.,
Flavoni, S., Friedlingstein, P., Grandpeix, J.-Y., Guez, L., Guilyardi, E.,
Hauglustaine, D., Hourdin, F., Idelkadi, A., Ghattas, J., Joussaume, S.,
Kageyama, M., Krinner, G., Labetoulle, S., Lahellec, A., Lefebvre, M.-P.,
Lefevre, F., Lévy, C., Li, Z. X., Lloyd, J., Lott, F., Madec, G., Mancip,
M., Marchand, M., Masson, S., Meurdesoif, Y., Mignot, J., Musat, I., Parouty,
S., Polcher, J., Rio, C., Schulz, M., Swingedouw, D., Szopa, S., Talandier,
C., Terray, P., Viovy, N., and Vuichard, N.: Climate change projections using
the IPSL-CM5 Earth System Model: from CMIP3 to CMIP5, Clim.
Dyn., 40, 2123–2165, https://doi.org/10.1007/s00382-012-1636-1, 2013. a, b, c, d
Eyring, V., Bony, S., Meehl, G. A., Senior, C. A., Stevens, B., Stouffer, R. J., and Taylor, K. E.: Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization, Geosci. Model Dev., 9, 1937–1958, https://doi.org/10.5194/gmd-9-1937-2016, 2016. a
Foken, T.: 50 Years of the Monin–Obukhov Similarity Theory,
Boundary-Lay. Meteorol., 119, 431–447, https://doi.org/10.1007/s10546-006-9048-6,
2006. a
Gander, M. J. and Halpern, L.: Optimized Schwarz Waveform Relaxation
Methods for Advection Reaction Diffusion Problems, SIAM J. Numer.
Anal., 45, 666–697, https://doi.org/10.1137/050642137, 2007. a
Gander, M. J., Halpern, L., and Nataf, F.: Optimal Convergence for
Overlapping and Non-Overlapping Schwarz Waveform Relaxation, in:
Proceedings of the 11th International Conference on Domain
Decomposition Methods, The University of Greenwich, Greenwich, UK, 27–36, available at: https://archive-ouverte.unige.ch/unige:8286 (last access: 10 May 2021),
1999. a
Gross, M., Wan, H., Rasch, P. J., Caldwell, P. M., Williamson, D. L., Klocke,
D., Jablonowski, C., Thatcher, D. R., Wood, N., Cullen, M., Beare, B.,
Willett, M., Lemarié, F., Blayo, E., Malardel, S., Termonia, P., Gassmann,
A., Lauritzen, P. H., Johansen, H., Zarzycki, C. M., Sakaguchi, K., and
Leung, R.: Physics–Dynamics Coupling in Weather, Climate, and
Earth System Models: Challenges and Recent Progress, Mon. Weather Rev., 146, 3505–3544, https://doi.org/10.1175/MWR-D-17-0345.1, 2018. a, b, c
Hunter, J. D.: Matplotlib: A 2D graphics environment, Comput. Sci. Eng., 9, 90–95, https://doi.org/10.1109/MCSE.2007.55, publisher: IEEE Computer Soc., 2007. a
Keyes, D. E., McInnes, L. C., Woodward, C., Gropp, W., Myra, E., Pernice, M.,
Bell, J., Brown, J., Clo, A., Connors, J., Constantinescu, E., Estep, D.,
Evans, K., Farhat, C., Hakim, A., Hammond, G., Hansen, G., Hill, J., Isaac,
T., Jiao, X., Jordan, K., Kaushik, D., Kaxiras, E., Koniges, A., Lee, K.,
Lott, A., Lu, Q., Magerlein, J., Maxwell, R., McCourt, M., Mehl, M.,
Pawlowski, R., Randles, A. P., Reynolds, D., Rivière, B., Rüde, U.,
Scheibe, T., Shadid, J., Sheehan, B., Shephard, M., Siegel, A., Smith, B.,
Tang, X., Wilson, C., and Wohlmuth, B.: Multiphysics simulations:
Challenges and opportunities, Int. J. High Perform. C., 27, 4–83, https://doi.org/10.1177/1094342012468181, 2013. a
Large, W. B.: Surface Fluxes for Practitioners of Global Ocean Data
Assimilation, in: Ocean Weather Forecasting, edited by: Chassignet,
E. P. and Verron, J., Springer-Verlag, Berlin/Heidelberg, 229–270,
https://doi.org/10.1007/1-4020-4028-8_9, 2006. a
Lemarié, F., Debreu, L., and Blayo, E.: Toward an Optimized
Global-in-Time Schwarz Algorithm for Diffusion Equations with
Discontinuous and Spatially Variable Coefficients, Part 1: The
Constant Coefficients Case, Electron. T. Numer. Ana., 40, 148–169, 2013. a
Lemarié, F., Blayo, E., and Debreu, L.: Analysis of Ocean-atmosphere
Coupling Algorithms: Consistency and Stability, Procedia Comput.
Sci., 51, 2066–2075, https://doi.org/10.1016/j.procs.2015.05.473, 2015. a, b, c, d
Locarnini, R. A., Mishonov, A. V., Antonov, J. I., Boyer, T. P., Garcia, H. E., Baranova, O. K., Zweng, M. M., Paver, C. R., Reagan, J. R., Johnson, D. R., Hamilton, M., and Seidov, D.: World OceanAtlas 2013, Volume 1: Temperature, edited by: Levitus, S., NOAA Atlas NESDIS 73, NOAA, available at: https://rda.ucar.edu/datasets/ds285.0/docs/woa13/woa13_vol1.pdf (last access: 10 May 2021),
2013. a, b
Marti, O., Braconnot, P., Dufresne, J.-L., Bellier, J., Benshila, R., Bony, S., Brockmann, P., Cadule, P., Caubel, A., Codron, F., de Noblet, N., Denvil, S., Fairhead, L., Fichefet, T., Foujols, M.-A., Friedlingstein, P., Goosse, H., Grandpeix, J.-Y., Guilyardi, E., Hourdin, F., Idelkadi, A., Kageyama, M., Krinner, G., Lévy, C., Madec, G., Mignot, J., Musat, I., Swingedouw, D., and
Talandier, C.: Key features of the IPSL ocean atmosphere model and its
sensitivity to atmospheric resolution, Clim. Dynam., 34, 1–26,
https://doi.org/10.1007/s00382-009-0640-6, 2010. a, b, c
Marti, O., Nguyen, S., Braconnot, P., Valcke, S., Lemarié, F., and Blayo, E.:
A Schwarz iterative method to evaluate ocean- atmosphere coupling schemes. Implementation and diagnostics in IPSL-CM6-SW-VLR. GMD-2020-307 [Data set], Geoscientific Model Development, Zenodo, https://doi.org/10.5281/zenodo.4273949, 2020. a
Pelletier, C., Lemarié, F., and Blayo, E.: Sensitivity analysis and metamodels for the bulk parametrization of turbulent air-sea fluxes, Q. J. Roy. Meteor. Soc., 144, 658–669, https://doi.org/10.1002/qj.3233, 2018. a
Rousset, C., Vancoppenolle, M., Madec, G., Fichefet, T., Flavoni, S., Barthélemy, A., Benshila, R., Chanut, J., Levy, C., Masson, S., and Vivier, F.: The Louvain-La-Neuve sea ice model LIM3.6: global and regional capabilities, Geosci. Model Dev., 8, 2991–3005, https://doi.org/10.5194/gmd-8-2991-2015, 2015. a, b
Sepulchre, P., Caubel, A., Ladant, J.-B., Bopp, L., Boucher, O., Braconnot, P., Brockmann, P., Cozic, A., Donnadieu, Y., Dufresne, J.-L., Estella-Perez, V., Ethé, C., Fluteau, F., Foujols, M.-A., Gastineau, G., Ghattas, J., Hauglustaine, D., Hourdin, F., Kageyama, M., Khodri, M., Marti, O., Meurdesoif, Y., Mignot, J., Sarr, A.-C., Servonnat, J., Swingedouw, D., Szopa, S., and Tardif, D.: IPSL-CM5A2 – an Earth system model designed for multi-millennial climate simulations, Geosci. Model Dev., 13, 3011–3053, https://doi.org/10.5194/gmd-13-3011-2020, 2020. a, b, c, d, e, f, g, h, i
Wikipedia: Roman timekeeping, available at:
https://en.wikipedia.org/w/index.php?title=Roman_timekeeping&oldid=990684875 (last access: 10 May 2021), 2020. a
Zender, C. S.: Analysis of self-describing gridded geoscience data with
netCDF Operators (NCO), Environ. Model. Softw., 23,
1338–1342, https://doi.org/10.1016/j.envsoft.2008.03.004, 2008. a
Short summary
State-of-the-art Earth system models, like the ones used in CMIP6, suffer from temporal inconsistencies at the ocean–atmosphere interface. In this study, a mathematically consistent iterative Schwarz method is used as a reference. Its tremendous computational cost makes it unusable for production runs, but it allows us to evaluate the error made when using legacy coupling schemes. The impact on the climate at longer timescales of days to decades is not evaluated.
State-of-the-art Earth system models, like the ones used in CMIP6, suffer from temporal...
