Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system
An observation product for thin sea ice thickness (SMOS-Ice) is derived from the brightness temperature data of the European Space Agency's (ESA) Soil Moisture and Ocean Salinity (SMOS) mission. This product is available in near-real time, at daily frequency, during the cold season. In this stu...
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Copernicus Publications
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Online Access: | https://doi.org/10.5194/tc-10-2745-2016 http://www.the-cryosphere.net/10/2745/2016/tc-10-2745-2016.pdf https://doaj.org/article/61e29207462147d286af7dcb42c32fde |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:61e29207462147d286af7dcb42c32fde 2023-05-15T15:16:10+02:00 Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system J. Xie F. Counillon L. Bertino X. Tian-Kunze L. Kaleschke 2016-11-01 https://doi.org/10.5194/tc-10-2745-2016 http://www.the-cryosphere.net/10/2745/2016/tc-10-2745-2016.pdf https://doaj.org/article/61e29207462147d286af7dcb42c32fde en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-10-2745-2016 http://www.the-cryosphere.net/10/2745/2016/tc-10-2745-2016.pdf https://doaj.org/article/61e29207462147d286af7dcb42c32fde undefined The Cryosphere, Vol 10, Iss 6, Pp 2745-2761 (2016) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/tc-10-2745-2016 2023-01-22T19:24:14Z An observation product for thin sea ice thickness (SMOS-Ice) is derived from the brightness temperature data of the European Space Agency's (ESA) Soil Moisture and Ocean Salinity (SMOS) mission. This product is available in near-real time, at daily frequency, during the cold season. In this study, we investigate the benefit of assimilating SMOS-Ice into the TOPAZ coupled ocean and sea ice forecasting system, which is the Arctic component of the Copernicus marine environment monitoring services. The TOPAZ system assimilates sea surface temperature (SST), altimetry data, temperature and salinity profiles, ice concentration, and ice drift with the ensemble Kalman filter (EnKF). The conditions for assimilation of sea ice thickness thinner than 0.4 m are favorable, as observations are reliable below this threshold and their probability distribution is comparable to that of the model. Two parallel Observing System Experiments (OSE) have been performed in March and November 2014, in which the thicknesses from SMOS-Ice (thinner than 0.4 m) are assimilated in addition to the standard observational data sets. It is found that the root mean square difference (RMSD) of thin sea ice thickness is reduced by 11 % in March and 22 % in November compared to the daily thin ice thicknesses of SMOS-Ice, which suggests that SMOS-Ice has a larger impact during the beginning of the cold season. Validation against independent observations of ice thickness from buoys and ice draft from moorings indicates that there are no degradations in the pack ice but there are some improvements near the ice edge close to where the SMOS-Ice has been assimilated. Assimilation of SMOS-Ice yields a slight improvement for ice concentration and degrades neither SST nor sea level anomaly. Analysis of the degrees of freedom for signal (DFS) indicates that the SMOS-Ice has a comparatively small impact but it has a significant contribution in constraining the system (> 20 % of the impact of all ice and ocean observations) near the ice edge. The areas of ... Article in Journal/Newspaper Arctic Sea ice The Cryosphere Unknown Arctic The Cryosphere 10 6 2745 2761 |
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English |
topic |
envir geo |
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envir geo J. Xie F. Counillon L. Bertino X. Tian-Kunze L. Kaleschke Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system |
topic_facet |
envir geo |
description |
An observation product for thin sea ice thickness (SMOS-Ice) is derived from the brightness temperature data of the European Space Agency's (ESA) Soil Moisture and Ocean Salinity (SMOS) mission. This product is available in near-real time, at daily frequency, during the cold season. In this study, we investigate the benefit of assimilating SMOS-Ice into the TOPAZ coupled ocean and sea ice forecasting system, which is the Arctic component of the Copernicus marine environment monitoring services. The TOPAZ system assimilates sea surface temperature (SST), altimetry data, temperature and salinity profiles, ice concentration, and ice drift with the ensemble Kalman filter (EnKF). The conditions for assimilation of sea ice thickness thinner than 0.4 m are favorable, as observations are reliable below this threshold and their probability distribution is comparable to that of the model. Two parallel Observing System Experiments (OSE) have been performed in March and November 2014, in which the thicknesses from SMOS-Ice (thinner than 0.4 m) are assimilated in addition to the standard observational data sets. It is found that the root mean square difference (RMSD) of thin sea ice thickness is reduced by 11 % in March and 22 % in November compared to the daily thin ice thicknesses of SMOS-Ice, which suggests that SMOS-Ice has a larger impact during the beginning of the cold season. Validation against independent observations of ice thickness from buoys and ice draft from moorings indicates that there are no degradations in the pack ice but there are some improvements near the ice edge close to where the SMOS-Ice has been assimilated. Assimilation of SMOS-Ice yields a slight improvement for ice concentration and degrades neither SST nor sea level anomaly. Analysis of the degrees of freedom for signal (DFS) indicates that the SMOS-Ice has a comparatively small impact but it has a significant contribution in constraining the system (> 20 % of the impact of all ice and ocean observations) near the ice edge. The areas of ... |
format |
Article in Journal/Newspaper |
author |
J. Xie F. Counillon L. Bertino X. Tian-Kunze L. Kaleschke |
author_facet |
J. Xie F. Counillon L. Bertino X. Tian-Kunze L. Kaleschke |
author_sort |
J. Xie |
title |
Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system |
title_short |
Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system |
title_full |
Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system |
title_fullStr |
Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system |
title_full_unstemmed |
Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system |
title_sort |
benefits of assimilating thin sea ice thickness from smos into the topaz system |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-2745-2016 http://www.the-cryosphere.net/10/2745/2016/tc-10-2745-2016.pdf https://doaj.org/article/61e29207462147d286af7dcb42c32fde |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice The Cryosphere |
genre_facet |
Arctic Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 6, Pp 2745-2761 (2016) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-10-2745-2016 http://www.the-cryosphere.net/10/2745/2016/tc-10-2745-2016.pdf https://doaj.org/article/61e29207462147d286af7dcb42c32fde |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-10-2745-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
6 |
container_start_page |
2745 |
op_container_end_page |
2761 |
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