Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses
In this study, sea ice concentration (SIC) budgets were calculated for five ocean-sea ice reanalyses (CFSR, C-GLORSv7, GLORYS12v1, NEMO-EnKF and ORAS5), in the Southern Ocean and compared with observations. Benefiting from the assimilation of SIC, the reanalysis products display a realistic represen...
Published in: | Climate Dynamics |
---|---|
Main Authors: | , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2022
|
Subjects: | |
Online Access: | http://hdl.handle.net/10138/350418 |
id |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/350418 |
---|---|
record_format |
openpolar |
spelling |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/350418 2024-01-07T09:39:54+01:00 Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses Nie, Yafei Uotila, Petteri Cheng, Bin Massonnet, François Kimura, Noriaki Cipollone, Andrea Lv, Xianqing Institute for Atmospheric and Earth System Research (INAR) 2022-11-02T13:06:03Z 21 application/pdf http://hdl.handle.net/10138/350418 eng eng Springer 10.1007/s00382-022-06260-x Nie , Y , Uotila , P , Cheng , B , Massonnet , F , Kimura , N , Cipollone , A & Lv , X 2022 , ' Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses ' , Climate Dynamics , vol. 59 , no. 11-12 , pp. 3265–3285 . https://doi.org/10.1007/s00382-022-06260-x ORCID: /0000-0002-2939-7561/work/122155617 a264c7b7-8ce6-48b1-9a30-15bdf8b40c06 http://hdl.handle.net/10138/350418 000782540200001 cc_by openAccess info:eu-repo/semantics/openAccess ATMOSPHERE Antarctic BIASES DATA ASSIMILATION IMPACT MODEL Reanalysis SALINITY SURFACE WIND SYSTEM Sea ice Sea ice concentration budget THICKNESS TRENDS 1171 Geosciences 114 Physical sciences Article publishedVersion 2022 ftunivhelsihelda 2023-12-14T00:15:34Z In this study, sea ice concentration (SIC) budgets were calculated for five ocean-sea ice reanalyses (CFSR, C-GLORSv7, GLORYS12v1, NEMO-EnKF and ORAS5), in the Southern Ocean and compared with observations. Benefiting from the assimilation of SIC, the reanalysis products display a realistic representation of sea ice extent as well as sea ice area. However, when applying the SIC budget diagnostics to decompose the changes in SIC into contributions from advection, divergence, thermodynamics, deformation and data assimilation, we find that both atmospheric and oceanic forcings and model configurations are significant contributors on the budget differences. For the CFSR, the primary source of deviation compared to other reanalyses is the stronger northward component of ice velocity, which results in stronger sea ice advection and divergence. Anomalous surface currents in the CFSR are proposed to be the main cause of the ice velocity anomaly. Furthermore, twice the mean ice thickness in the CFSR compared to other reanalyses makes it more susceptible to wind and oceanic stresses under Coriolis forces, exacerbating the northward drift of sea ice. The C-GLORSv7, GLORYS12v1 and NEMO-EnKF have some underestimation of the contribution of advection and divergence to changes in SIC in autumn, winter and spring compared to observations, but are more reasonable in summer. ORAS5, although using the same coupled model and atmospheric forcing as C-GLORSv7 and GLORYS12v1, has a more significant underestimation of advection and divergence to changes in SIC compared to these two reanalyses. The results of the SIC budgets of five ocean-sea ice reanalyses in the Southern Ocean suggest that future reanalyses should focus on improving the modelling of sea ice velocities, for example through assimilation of sea ice drift observations. Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean HELDA – University of Helsinki Open Repository Antarctic Southern Ocean Climate Dynamics 59 11-12 3265 3285 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
ATMOSPHERE Antarctic BIASES DATA ASSIMILATION IMPACT MODEL Reanalysis SALINITY SURFACE WIND SYSTEM Sea ice Sea ice concentration budget THICKNESS TRENDS 1171 Geosciences 114 Physical sciences |
spellingShingle |
ATMOSPHERE Antarctic BIASES DATA ASSIMILATION IMPACT MODEL Reanalysis SALINITY SURFACE WIND SYSTEM Sea ice Sea ice concentration budget THICKNESS TRENDS 1171 Geosciences 114 Physical sciences Nie, Yafei Uotila, Petteri Cheng, Bin Massonnet, François Kimura, Noriaki Cipollone, Andrea Lv, Xianqing Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
topic_facet |
ATMOSPHERE Antarctic BIASES DATA ASSIMILATION IMPACT MODEL Reanalysis SALINITY SURFACE WIND SYSTEM Sea ice Sea ice concentration budget THICKNESS TRENDS 1171 Geosciences 114 Physical sciences |
description |
In this study, sea ice concentration (SIC) budgets were calculated for five ocean-sea ice reanalyses (CFSR, C-GLORSv7, GLORYS12v1, NEMO-EnKF and ORAS5), in the Southern Ocean and compared with observations. Benefiting from the assimilation of SIC, the reanalysis products display a realistic representation of sea ice extent as well as sea ice area. However, when applying the SIC budget diagnostics to decompose the changes in SIC into contributions from advection, divergence, thermodynamics, deformation and data assimilation, we find that both atmospheric and oceanic forcings and model configurations are significant contributors on the budget differences. For the CFSR, the primary source of deviation compared to other reanalyses is the stronger northward component of ice velocity, which results in stronger sea ice advection and divergence. Anomalous surface currents in the CFSR are proposed to be the main cause of the ice velocity anomaly. Furthermore, twice the mean ice thickness in the CFSR compared to other reanalyses makes it more susceptible to wind and oceanic stresses under Coriolis forces, exacerbating the northward drift of sea ice. The C-GLORSv7, GLORYS12v1 and NEMO-EnKF have some underestimation of the contribution of advection and divergence to changes in SIC in autumn, winter and spring compared to observations, but are more reasonable in summer. ORAS5, although using the same coupled model and atmospheric forcing as C-GLORSv7 and GLORYS12v1, has a more significant underestimation of advection and divergence to changes in SIC compared to these two reanalyses. The results of the SIC budgets of five ocean-sea ice reanalyses in the Southern Ocean suggest that future reanalyses should focus on improving the modelling of sea ice velocities, for example through assimilation of sea ice drift observations. Peer reviewed |
author2 |
Institute for Atmospheric and Earth System Research (INAR) |
format |
Article in Journal/Newspaper |
author |
Nie, Yafei Uotila, Petteri Cheng, Bin Massonnet, François Kimura, Noriaki Cipollone, Andrea Lv, Xianqing |
author_facet |
Nie, Yafei Uotila, Petteri Cheng, Bin Massonnet, François Kimura, Noriaki Cipollone, Andrea Lv, Xianqing |
author_sort |
Nie, Yafei |
title |
Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
title_short |
Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
title_full |
Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
title_fullStr |
Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
title_full_unstemmed |
Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
title_sort |
southern ocean sea ice concentration budgets of five ocean-sea ice reanalyses |
publisher |
Springer |
publishDate |
2022 |
url |
http://hdl.handle.net/10138/350418 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
10.1007/s00382-022-06260-x Nie , Y , Uotila , P , Cheng , B , Massonnet , F , Kimura , N , Cipollone , A & Lv , X 2022 , ' Southern Ocean sea ice concentration budgets of five ocean-sea ice reanalyses ' , Climate Dynamics , vol. 59 , no. 11-12 , pp. 3265–3285 . https://doi.org/10.1007/s00382-022-06260-x ORCID: /0000-0002-2939-7561/work/122155617 a264c7b7-8ce6-48b1-9a30-15bdf8b40c06 http://hdl.handle.net/10138/350418 000782540200001 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Climate Dynamics |
container_volume |
59 |
container_issue |
11-12 |
container_start_page |
3265 |
op_container_end_page |
3285 |
_version_ |
1787430202341588992 |