Consistent biases in Antarctic sea ice concentration simulated by climate models
The simulation of Antarctic sea ice in global climate models often does not agree with observations. In this study, we examine the compactness of sea ice, as well as the regional distribution of sea ice concentration, in climate models from the latest Coupled Model Intercomparison Project (CMIP5) an...
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ftcopernicus:oai:publications.copernicus.org:tc60116 2023-05-15T13:54:27+02:00 Consistent biases in Antarctic sea ice concentration simulated by climate models Roach, Lettie A. Dean, Samuel M. Renwick, James A. 2019-01-18 application/pdf https://doi.org/10.5194/tc-12-365-2018 https://tc.copernicus.org/articles/12/365/2018/ eng eng doi:10.5194/tc-12-365-2018 https://tc.copernicus.org/articles/12/365/2018/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-12-365-2018 2020-07-20T16:23:26Z The simulation of Antarctic sea ice in global climate models often does not agree with observations. In this study, we examine the compactness of sea ice, as well as the regional distribution of sea ice concentration, in climate models from the latest Coupled Model Intercomparison Project (CMIP5) and in satellite observations. We find substantial differences in concentration values between different sets of satellite observations, particularly at high concentrations, requiring careful treatment when comparing to models. As a fraction of total sea ice extent, models simulate too much loose, low-concentration sea ice cover throughout the year, and too little compact, high-concentration cover in the summer. In spite of the differences in physics between models, these tendencies are broadly consistent across the population of 40 CMIP5 simulations, a result not previously highlighted. Separating models with and without an explicit lateral melt term, we find that inclusion of lateral melt may account for overestimation of low-concentration cover. Targeted model experiments with a coupled ocean–sea ice model show that choice of constant floe diameter in the lateral melt scheme can also impact representation of loose ice. This suggests that current sea ice thermodynamics contribute to the inadequate simulation of the low-concentration regime in many models. Text Antarc* Antarctic Sea ice Copernicus Publications: E-Journals Antarctic The Cryosphere 12 1 365 383 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The simulation of Antarctic sea ice in global climate models often does not agree with observations. In this study, we examine the compactness of sea ice, as well as the regional distribution of sea ice concentration, in climate models from the latest Coupled Model Intercomparison Project (CMIP5) and in satellite observations. We find substantial differences in concentration values between different sets of satellite observations, particularly at high concentrations, requiring careful treatment when comparing to models. As a fraction of total sea ice extent, models simulate too much loose, low-concentration sea ice cover throughout the year, and too little compact, high-concentration cover in the summer. In spite of the differences in physics between models, these tendencies are broadly consistent across the population of 40 CMIP5 simulations, a result not previously highlighted. Separating models with and without an explicit lateral melt term, we find that inclusion of lateral melt may account for overestimation of low-concentration cover. Targeted model experiments with a coupled ocean–sea ice model show that choice of constant floe diameter in the lateral melt scheme can also impact representation of loose ice. This suggests that current sea ice thermodynamics contribute to the inadequate simulation of the low-concentration regime in many models. |
format |
Text |
author |
Roach, Lettie A. Dean, Samuel M. Renwick, James A. |
spellingShingle |
Roach, Lettie A. Dean, Samuel M. Renwick, James A. Consistent biases in Antarctic sea ice concentration simulated by climate models |
author_facet |
Roach, Lettie A. Dean, Samuel M. Renwick, James A. |
author_sort |
Roach, Lettie A. |
title |
Consistent biases in Antarctic sea ice concentration simulated by climate models |
title_short |
Consistent biases in Antarctic sea ice concentration simulated by climate models |
title_full |
Consistent biases in Antarctic sea ice concentration simulated by climate models |
title_fullStr |
Consistent biases in Antarctic sea ice concentration simulated by climate models |
title_full_unstemmed |
Consistent biases in Antarctic sea ice concentration simulated by climate models |
title_sort |
consistent biases in antarctic sea ice concentration simulated by climate models |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-12-365-2018 https://tc.copernicus.org/articles/12/365/2018/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-12-365-2018 https://tc.copernicus.org/articles/12/365/2018/ |
op_doi |
https://doi.org/10.5194/tc-12-365-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
1 |
container_start_page |
365 |
op_container_end_page |
383 |
_version_ |
1766260310997467136 |