Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization
The Los Alamos sea ice model (CICE) is being tested in standalone mode to identify biases that limit its suitability for seasonal prediction. The prescribed atmospheric forcings to drive CICE are from the NCEP Climate Forecast System Reanalysis (CFSR). A built-in mixed layer ocean model in CICE is u...
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ftcopernicus:oai:publications.copernicus.org:egusphere108092 2023-05-15T13:38:41+02:00 Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization Sun, Shan Solomon, Amy 2022-12-19 application/pdf https://doi.org/10.5194/egusphere-2022-1368 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1368/ eng eng doi:10.5194/egusphere-2022-1368 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1368/ eISSN: Text 2022 ftcopernicus https://doi.org/10.5194/egusphere-2022-1368 2022-12-26T17:22:43Z The Los Alamos sea ice model (CICE) is being tested in standalone mode to identify biases that limit its suitability for seasonal prediction. The prescribed atmospheric forcings to drive CICE are from the NCEP Climate Forecast System Reanalysis (CFSR). A built-in mixed layer ocean model in CICE is used. Initial conditions for the sea ice and the mixed layer ocean are also from CFSR in the control experiments. The simulated sea ice extent is generally in good agreement with observations in the warm season at all lead times up to 12 months both in the Arctic and Antarctic, suggesting that CICE is able to provide useful sea ice edge information for seasonal prediction. However, the Arctic sea ice thickness forecast has a positive bias stemming from the initial conditions, and this bias often persists for more than a season, limiting the model’s seasonal forecast skill. When this bias is reduced by initializing ice thickness using the CryoSat-2 satellite observations while keeping all other initial fields unchanged in the CS2_IC experiments, both simulated ice edge and thickness improve. This confirms the important roles of sea ice thickness initialization in sea ice seasonal prediction seen in many studies. Text Antarc* Antarctic Arctic Sea ice Copernicus Publications: E-Journals Antarctic Arctic |
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Copernicus Publications: E-Journals |
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English |
description |
The Los Alamos sea ice model (CICE) is being tested in standalone mode to identify biases that limit its suitability for seasonal prediction. The prescribed atmospheric forcings to drive CICE are from the NCEP Climate Forecast System Reanalysis (CFSR). A built-in mixed layer ocean model in CICE is used. Initial conditions for the sea ice and the mixed layer ocean are also from CFSR in the control experiments. The simulated sea ice extent is generally in good agreement with observations in the warm season at all lead times up to 12 months both in the Arctic and Antarctic, suggesting that CICE is able to provide useful sea ice edge information for seasonal prediction. However, the Arctic sea ice thickness forecast has a positive bias stemming from the initial conditions, and this bias often persists for more than a season, limiting the model’s seasonal forecast skill. When this bias is reduced by initializing ice thickness using the CryoSat-2 satellite observations while keeping all other initial fields unchanged in the CS2_IC experiments, both simulated ice edge and thickness improve. This confirms the important roles of sea ice thickness initialization in sea ice seasonal prediction seen in many studies. |
format |
Text |
author |
Sun, Shan Solomon, Amy |
spellingShingle |
Sun, Shan Solomon, Amy Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization |
author_facet |
Sun, Shan Solomon, Amy |
author_sort |
Sun, Shan |
title |
Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization |
title_short |
Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization |
title_full |
Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization |
title_fullStr |
Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization |
title_full_unstemmed |
Seasonal Sea Ice Prediction with the CICE Model and Positive Impact of CryoSat-2 Ice Thickness Initialization |
title_sort |
seasonal sea ice prediction with the cice model and positive impact of cryosat-2 ice thickness initialization |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-1368 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1368/ |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic Sea ice |
genre_facet |
Antarc* Antarctic Arctic Sea ice |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-1368 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1368/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-1368 |
_version_ |
1766109751502962688 |