An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes
We assess Antarctic sea ice climatology and variability in version 2 of the Community Earth System Model (CESM2) and compare it to that in the older CESM1 and (where appropriate) real-world observations. In CESM2, Antarctic sea ice is thinner and less extensive than in CESM1, though sea ice area is...
Published in: | Journal of Advances in Modeling Earth Systems |
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Language: | English |
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2021
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Online Access: | https://doi.org/10.1029/2020MS002143 |
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ftncar:oai:drupal-site.org:articles_24250 2024-04-28T08:00:46+00:00 An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes Singh, Hansi K. A. (author) Landrum, Laura (author) Holland, Marika M. (author) Bailey, David A. (author) DuVivier, Alice K. (author) 2021-03 https://doi.org/10.1029/2020MS002143 en eng Journal of Advances in Modeling Earth Systems--J Adv Model Earth Syst--1942-2466--1942-2466 articles:24250 ark:/85065/d7zs30x0 doi:10.1029/2020MS002143 Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2021 ftncar https://doi.org/10.1029/2020MS002143 2024-04-04T17:34:52Z We assess Antarctic sea ice climatology and variability in version 2 of the Community Earth System Model (CESM2) and compare it to that in the older CESM1 and (where appropriate) real-world observations. In CESM2, Antarctic sea ice is thinner and less extensive than in CESM1, though sea ice area is still approximately 1 million km(2) greater in CESM2 than in present-day observations. Though there is less Antarctic sea ice in CESM2, the annual cycle of ice growth and melt is more vigorous in CESM2 than in CESM1. A new mushy layer thermodynamics formulation implemented in the latest version of the Community Ice Code (CICE) in CESM2 accounts for both greater frazil ice formation in coastal polynyas and more snow-to-ice conversion near the edge of the ice pack in the new model. Greater winter ice divergence in CESM2 (relative to CESM1) is due to stronger stationary wave activity and greater wind stress curl over the ice pack. Greater wind stress curl, in turn, drives more warm water upwelling under the ice pack, thinning it and decreasing its extent. Overall, differences between Antarctic sea ice in CESM2 and CESM1 arise due to both differences in their sea ice thermodynamics formulations and differences in their coupled atmosphere-ocean states. 1643484 1852977 Article in Journal/Newspaper Antarc* Antarctic ice pack Sea ice OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Journal of Advances in Modeling Earth Systems 13 3 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
We assess Antarctic sea ice climatology and variability in version 2 of the Community Earth System Model (CESM2) and compare it to that in the older CESM1 and (where appropriate) real-world observations. In CESM2, Antarctic sea ice is thinner and less extensive than in CESM1, though sea ice area is still approximately 1 million km(2) greater in CESM2 than in present-day observations. Though there is less Antarctic sea ice in CESM2, the annual cycle of ice growth and melt is more vigorous in CESM2 than in CESM1. A new mushy layer thermodynamics formulation implemented in the latest version of the Community Ice Code (CICE) in CESM2 accounts for both greater frazil ice formation in coastal polynyas and more snow-to-ice conversion near the edge of the ice pack in the new model. Greater winter ice divergence in CESM2 (relative to CESM1) is due to stronger stationary wave activity and greater wind stress curl over the ice pack. Greater wind stress curl, in turn, drives more warm water upwelling under the ice pack, thinning it and decreasing its extent. Overall, differences between Antarctic sea ice in CESM2 and CESM1 arise due to both differences in their sea ice thermodynamics formulations and differences in their coupled atmosphere-ocean states. 1643484 1852977 |
author2 |
Singh, Hansi K. A. (author) Landrum, Laura (author) Holland, Marika M. (author) Bailey, David A. (author) DuVivier, Alice K. (author) |
format |
Article in Journal/Newspaper |
title |
An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
spellingShingle |
An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
title_short |
An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
title_full |
An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
title_fullStr |
An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
title_full_unstemmed |
An overview of Antarctic sea ice in the Community Earth System Model version 2, part I: Analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
title_sort |
overview of antarctic sea ice in the community earth system model version 2, part i: analysis of the seasonal cycle in the context of sea ice thermodynamics and coupled atmosphere‐ocean‐ice processes |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020MS002143 |
genre |
Antarc* Antarctic ice pack Sea ice |
genre_facet |
Antarc* Antarctic ice pack Sea ice |
op_relation |
Journal of Advances in Modeling Earth Systems--J Adv Model Earth Syst--1942-2466--1942-2466 articles:24250 ark:/85065/d7zs30x0 doi:10.1029/2020MS002143 |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1029/2020MS002143 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
13 |
container_issue |
3 |
_version_ |
1797572851154288640 |