Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis
In the Arctic, the sea surface salinity (SSS) plays a key role in processes related to water mixing and sea ice. However, the lack of salinity observations causes large uncertainties in Arctic Ocean forecasts and reanalysis. Recently the Soil Moisture and Ocean Salinity (SMOS) satellite mission was...
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ftcopernicus:oai:publications.copernicus.org:egusphere105225 2023-05-15T14:35:29+02:00 Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis Xie, Jiping Raj, Roshin P. Bertino, Laurent Martínez, Justino Gabarró, Carolina Catany, Rafael 2023-03-09 application/pdf https://doi.org/10.5194/egusphere-2022-660 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-660/ eng eng doi:10.5194/egusphere-2022-660 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-660/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2022-660 2023-03-13T17:23:10Z In the Arctic, the sea surface salinity (SSS) plays a key role in processes related to water mixing and sea ice. However, the lack of salinity observations causes large uncertainties in Arctic Ocean forecasts and reanalysis. Recently the Soil Moisture and Ocean Salinity (SMOS) satellite mission was used by the Barcelona Expert Centre to develop an Arctic SSS product. In this study, we evaluate the impact of assimilating this data in a coupled ocean–ice data assimilation system. Using the deterministic ensemble Kalman filter from July to December 2016, two assimilation runs respectively assimilated two successive versions of the SMOS SSS product on top of a pre-existing reanalysis run. The runs were validated against independent in situ salinity profiles in the Arctic. The results show that the biases and the root-mean-squared differences (RMSD) of SSS are reduced by 10 % to 50 % depending on the area and highlight the importance of assimilating satellite salinity data. The time series of freshwater content (FWC) further shows that its seasonal cycle can be adjusted by assimilation of the SSS products, which is encouraging of the assimilation of SSS in a long-time reanalysis to better reproduce the Arctic water cycle. Text Arctic Arctic Ocean Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean |
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English |
description |
In the Arctic, the sea surface salinity (SSS) plays a key role in processes related to water mixing and sea ice. However, the lack of salinity observations causes large uncertainties in Arctic Ocean forecasts and reanalysis. Recently the Soil Moisture and Ocean Salinity (SMOS) satellite mission was used by the Barcelona Expert Centre to develop an Arctic SSS product. In this study, we evaluate the impact of assimilating this data in a coupled ocean–ice data assimilation system. Using the deterministic ensemble Kalman filter from July to December 2016, two assimilation runs respectively assimilated two successive versions of the SMOS SSS product on top of a pre-existing reanalysis run. The runs were validated against independent in situ salinity profiles in the Arctic. The results show that the biases and the root-mean-squared differences (RMSD) of SSS are reduced by 10 % to 50 % depending on the area and highlight the importance of assimilating satellite salinity data. The time series of freshwater content (FWC) further shows that its seasonal cycle can be adjusted by assimilation of the SSS products, which is encouraging of the assimilation of SSS in a long-time reanalysis to better reproduce the Arctic water cycle. |
format |
Text |
author |
Xie, Jiping Raj, Roshin P. Bertino, Laurent Martínez, Justino Gabarró, Carolina Catany, Rafael |
spellingShingle |
Xie, Jiping Raj, Roshin P. Bertino, Laurent Martínez, Justino Gabarró, Carolina Catany, Rafael Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis |
author_facet |
Xie, Jiping Raj, Roshin P. Bertino, Laurent Martínez, Justino Gabarró, Carolina Catany, Rafael |
author_sort |
Xie, Jiping |
title |
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis |
title_short |
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis |
title_full |
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis |
title_fullStr |
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis |
title_full_unstemmed |
Assimilation of sea surface salinities from SMOS in an Arctic coupled ocean and sea ice reanalysis |
title_sort |
assimilation of sea surface salinities from smos in an arctic coupled ocean and sea ice reanalysis |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-660 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-660/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-660 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-660/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-660 |
_version_ |
1766308305772216320 |