Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component
The sea ice component of the Community Earth System Model version 2 (CESM2) contains new "mushy-layer" physics that simulates prognostic salinity in the sea ice, with consequent modifications to sea ice thermodynamics and the treatment of melt ponds. The changes to the sea ice model and th...
Published in: | Journal of Advances in Modeling Earth Systems |
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Online Access: | https://doi.org/10.1029/2020MS002154 |
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ftncar:oai:drupal-site.org:articles_23842 2024-04-28T07:53:44+00:00 Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component Bailey, David A. (author) Holland, Marika M. (author) DuVivier, Alice K. (author) Hunke, Elizabeth C. (author) Turner, Adrian K. (author) 2020-11-29 https://doi.org/10.1029/2020MS002154 en eng Journal of Advances in Modeling Earth Systems--J. Adv. Model. Earth Syst.--1942-2466--1942-2466 articles:23842 ark:/85065/d76976ww doi:10.1029/2020MS002154 Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2020 ftncar https://doi.org/10.1029/2020MS002154 2024-04-04T17:34:52Z The sea ice component of the Community Earth System Model version 2 (CESM2) contains new "mushy-layer" physics that simulates prognostic salinity in the sea ice, with consequent modifications to sea ice thermodynamics and the treatment of melt ponds. The changes to the sea ice model and their influence on coupled model simulations are described here. Two simulations were performed to assess the changes in the vertical thermodynamics formulation with prognostic salinity compared to a constant salinity profile. Inclusion of the mushy layer thermodynamics of Turner et al. (2013, ) in a fully coupled Earth system model produces thicker and more extensive sea ice in the Arctic, with relatively unchanged sea ice in the Antarctic compared to simulations using a constant salinity profile. While this is consistent with the findings of uncoupled ice-ocean model studies, the role of the frazil and congelation growth is more important in fully coupled simulations. Melt pond drainage is also an important contribution to simulated ice thickness differences as also found in the uncoupled simulations of Turner and Hunke (2015; ). However, it is an interaction of the ponds and the snow fraction that impacts the surface albedo and hence the top melt. The changes in the thermodynamics and resulting ice state modify the ice-ocean-atmosphere fluxes with impacts on the atmosphere and ocean states, particularly temperature. 1724748 1852977 Article in Journal/Newspaper albedo Antarc* Antarctic Arctic Sea ice OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Journal of Advances in Modeling Earth Systems 12 11 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The sea ice component of the Community Earth System Model version 2 (CESM2) contains new "mushy-layer" physics that simulates prognostic salinity in the sea ice, with consequent modifications to sea ice thermodynamics and the treatment of melt ponds. The changes to the sea ice model and their influence on coupled model simulations are described here. Two simulations were performed to assess the changes in the vertical thermodynamics formulation with prognostic salinity compared to a constant salinity profile. Inclusion of the mushy layer thermodynamics of Turner et al. (2013, ) in a fully coupled Earth system model produces thicker and more extensive sea ice in the Arctic, with relatively unchanged sea ice in the Antarctic compared to simulations using a constant salinity profile. While this is consistent with the findings of uncoupled ice-ocean model studies, the role of the frazil and congelation growth is more important in fully coupled simulations. Melt pond drainage is also an important contribution to simulated ice thickness differences as also found in the uncoupled simulations of Turner and Hunke (2015; ). However, it is an interaction of the ponds and the snow fraction that impacts the surface albedo and hence the top melt. The changes in the thermodynamics and resulting ice state modify the ice-ocean-atmosphere fluxes with impacts on the atmosphere and ocean states, particularly temperature. 1724748 1852977 |
author2 |
Bailey, David A. (author) Holland, Marika M. (author) DuVivier, Alice K. (author) Hunke, Elizabeth C. (author) Turner, Adrian K. (author) |
format |
Article in Journal/Newspaper |
title |
Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component |
spellingShingle |
Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component |
title_short |
Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component |
title_full |
Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component |
title_fullStr |
Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component |
title_full_unstemmed |
Impact of a new sea ice thermodynamic formulation in the CESM2 sea ice component |
title_sort |
impact of a new sea ice thermodynamic formulation in the cesm2 sea ice component |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020MS002154 |
genre |
albedo Antarc* Antarctic Arctic Sea ice |
genre_facet |
albedo Antarc* Antarctic Arctic Sea ice |
op_relation |
Journal of Advances in Modeling Earth Systems--J. Adv. Model. Earth Syst.--1942-2466--1942-2466 articles:23842 ark:/85065/d76976ww doi:10.1029/2020MS002154 |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1029/2020MS002154 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
12 |
container_issue |
11 |
_version_ |
1797573083735785472 |