Submitted as: model evaluation paper 08 Oct 2021

Submitted as: model evaluation paper | 08 Oct 2021

Review status: this preprint is currently under review for the journal GMD.

An evaluation of the E3SMv1-Arctic Ocean/Sea Ice Regionally Refined Model

Milena Veneziani1, Wieslaw Maslowski2, Younjoo J. Lee2, Gennaro D'Angelo1, Robert Osinski3, Mark R. Petersen1, Wilbert Weijer1, Anthony P. Craig4, John D. Wolfe1, Darin Comeau1, and Adrian K. Turner1 Milena Veneziani et al.
  • 1Los Alamos National Laboratory, Los Alamos, NM, USA
  • 2Naval Postgraduate School, Monterey, CA, USA
  • 3Institute of Oceanology of Polish Academy of Sciences, Sopot, Poland
  • 4independent researcher

Abstract. The Energy Exascale Earth System Model (E3SM) is a state-of-the-science Earth system model (ESM) with the ability to focus horizontal resolution of its multiple components in specific areas. Regionally refined global ESMs are motivated by the need to explicitly resolve, rather than parameterize, relevant physics within the regions of refined resolution, while offering significant computational cost savings relative to the respective cost of high-resolution (HR) global configurations. In this paper, we document results from the first Arctic regionally refined E3SM configuration for the ocean and sea-ice components (E3SM-Arctic-OSI), while employing data-based atmosphere, land, and hydrology components. Our aim is an improved representation of the Arctic coupled ocean and sea ice state, its variability and trends, and the exchanges of mass and property fluxes between the Arctic and the Subarctic. We find that E3SM-Arctic-OSI increases the realism of simulated Arctic ocean and sea ice conditions compared to a similar low-resolution E3SM simulation without the Arctic regional refinement in ocean and sea ice components (E3SM-LR-OSI). In particular, exchanges through the main Arctic gateways are greatly improved with respect to E3SM-LR-OSI. Other aspects, such as the Arctic freshwater content variability and sea-ice trends, are also satisfactorily simulated. Yet, other features, such as the upper ocean stratification and the sea-ice thickness distribution, need further improvements, involving either more advanced parameterizations, model tuning, or additional grid refinements. Overall, E3SM-Arctic-OSI offers an improved representation of the Arctic system relative to E3SM-LR-OSI, at a fraction (15 %) of the computational cost of comparable global high-resolution configurations, while permitting exchanges with the lower latitude oceans that can not be directly accounted for in Arctic regional models.

Milena Veneziani et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-293', David Bailey, 03 Dec 2021
  • RC2: 'Comment on gmd-2021-293', Anonymous Referee #2, 05 Dec 2021

Milena Veneziani et al.

Data sets

Model data in support of the E3SMv1-Arctic-OSI GMD manuscript (2021) Milena Veneziani

Model code and software

milenaveneziani/E3SM: e3sm-arctic-osi-2019 jedwards4b, James Foucar, and many co-authors

Milena Veneziani et al.


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Short summary
We present an Earth System Model (ESM) simulation, E3SM-Arctic-OSI, with a refined grid to better resolve the Arctic Ocean/sea ice system and low spatial resolution elsewhere. This configuration satisfactorily represents many aspects of the Arctic system and its interactions with the subarctic, while keeping computational costs at a fraction of the cost necessary for a global high resolution ESM. E3SM-Arctic can thus be an efficient tool to study Arctic processes on climate-relevant time scales.