A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation
Sea ice variability in the Southern Ocean has a complex spatio-temporal structure. In a global warming context, the Antarctic sea ice cover has slightly expanded over the recent decades. This increase in sea ice extent results, however, from the sum of positive and negative regional trends and is in...
Published in: | Ocean Modelling |
---|---|
Main Authors: | , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2013
|
Subjects: | |
Online Access: | http://hdl.handle.net/2078.1/129275 https://doi.org/10.1016/j.ocemod.2013.01.003 |
id |
ftunivlouvain:oai:dial.uclouvain.be:boreal:129275 |
---|---|
record_format |
openpolar |
spelling |
ftunivlouvain:oai:dial.uclouvain.be:boreal:129275 2024-05-19T07:28:23+00:00 A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation Massonnet, François Mathiot, P. Fichefet, Thierry Goosse, Hugues König Beatty, C. Vancoppenolle, M. Lavergne, T. UCL - SST/ELI/ELIC - Earth & Climate 2013 http://hdl.handle.net/2078.1/129275 https://doi.org/10.1016/j.ocemod.2013.01.003 eng eng boreal:129275 http://hdl.handle.net/2078.1/129275 doi:10.1016/j.ocemod.2013.01.003 urn:ISSN:1463-5003 info:eu-repo/semantics/restrictedAccess Ocean Modelling, Vol. 64, p. 67-75 (2013) Antarctic EnKF Sea ice thickness and volumes Southern ocean Trends Variability Climatology Global warming Oceanography Sea ice Climate variation Data assimilation Ice cover Ice thickness Kalman filter Numerical model Reconstruction Trend analysis Volume change Amundsen Sea Bellingshausen Sea Ross Sea Weddell Sea Sea ice thickness and volume 1443 info:eu-repo/semantics/article 2013 ftunivlouvain https://doi.org/10.1016/j.ocemod.2013.01.003 2024-04-24T01:38:40Z Sea ice variability in the Southern Ocean has a complex spatio-temporal structure. In a global warming context, the Antarctic sea ice cover has slightly expanded over the recent decades. This increase in sea ice extent results, however, from the sum of positive and negative regional trends and is influenced by a wide range of modes of climate variability. An additional view on sea ice thickness and volume changes would improve our understanding. Still, no large-scale multi-decadal well-sampled record of Antarctic sea ice thickness exists to date. To address this issue, we assimilate real sea ice concentration data into the ocean-sea ice model NEMO-LIM2 using an ensemble Kalman filter and demonstrate the positive impacts on the global sea ice cover. This paper reports the 1980-2008 evolution (monthly anomalies, trends plus their uncertainty ranges) of sea ice volume and thickness in different sectors of the Southern Ocean. We find that the global Antarctic sea ice volume has risen at a pace of 355 ± 338km3/decade (5.6 ± 5.3%/decade) during this period, with an increase in the Ross and Weddell Seas (150 ± 124 and 209 ± 362km3/decade, respectively) and a decrease in the Amundsen-Bellingshausen Seas (-45 ± 54km3/decade). Sea ice volume anomalies co-vary well with extent anomalies, and exhibit yearly to decadal fluctuations. The results stress the need to analyze sea ice changes at the regional level first and then at the hemispheric level. © 2013 Elsevier Ltd. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Bellingshausen Sea Ross Sea Sea ice Southern Ocean Weddell Sea DIAL@UCLouvain (Université catholique de Louvain) Ocean Modelling 64 67 75 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Antarctic EnKF Sea ice thickness and volumes Southern ocean Trends Variability Climatology Global warming Oceanography Sea ice Climate variation Data assimilation Ice cover Ice thickness Kalman filter Numerical model Reconstruction Trend analysis Volume change Amundsen Sea Bellingshausen Sea Ross Sea Weddell Sea Sea ice thickness and volume 1443 |
spellingShingle |
Antarctic EnKF Sea ice thickness and volumes Southern ocean Trends Variability Climatology Global warming Oceanography Sea ice Climate variation Data assimilation Ice cover Ice thickness Kalman filter Numerical model Reconstruction Trend analysis Volume change Amundsen Sea Bellingshausen Sea Ross Sea Weddell Sea Sea ice thickness and volume 1443 Massonnet, François Mathiot, P. Fichefet, Thierry Goosse, Hugues König Beatty, C. Vancoppenolle, M. Lavergne, T. A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
topic_facet |
Antarctic EnKF Sea ice thickness and volumes Southern ocean Trends Variability Climatology Global warming Oceanography Sea ice Climate variation Data assimilation Ice cover Ice thickness Kalman filter Numerical model Reconstruction Trend analysis Volume change Amundsen Sea Bellingshausen Sea Ross Sea Weddell Sea Sea ice thickness and volume 1443 |
description |
Sea ice variability in the Southern Ocean has a complex spatio-temporal structure. In a global warming context, the Antarctic sea ice cover has slightly expanded over the recent decades. This increase in sea ice extent results, however, from the sum of positive and negative regional trends and is influenced by a wide range of modes of climate variability. An additional view on sea ice thickness and volume changes would improve our understanding. Still, no large-scale multi-decadal well-sampled record of Antarctic sea ice thickness exists to date. To address this issue, we assimilate real sea ice concentration data into the ocean-sea ice model NEMO-LIM2 using an ensemble Kalman filter and demonstrate the positive impacts on the global sea ice cover. This paper reports the 1980-2008 evolution (monthly anomalies, trends plus their uncertainty ranges) of sea ice volume and thickness in different sectors of the Southern Ocean. We find that the global Antarctic sea ice volume has risen at a pace of 355 ± 338km3/decade (5.6 ± 5.3%/decade) during this period, with an increase in the Ross and Weddell Seas (150 ± 124 and 209 ± 362km3/decade, respectively) and a decrease in the Amundsen-Bellingshausen Seas (-45 ± 54km3/decade). Sea ice volume anomalies co-vary well with extent anomalies, and exhibit yearly to decadal fluctuations. The results stress the need to analyze sea ice changes at the regional level first and then at the hemispheric level. © 2013 Elsevier Ltd. |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Massonnet, François Mathiot, P. Fichefet, Thierry Goosse, Hugues König Beatty, C. Vancoppenolle, M. Lavergne, T. |
author_facet |
Massonnet, François Mathiot, P. Fichefet, Thierry Goosse, Hugues König Beatty, C. Vancoppenolle, M. Lavergne, T. |
author_sort |
Massonnet, François |
title |
A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
title_short |
A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
title_full |
A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
title_fullStr |
A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
title_full_unstemmed |
A model reconstruction of the Antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
title_sort |
model reconstruction of the antarctic sea ice thickness and volume changes over 1980-2008 using data assimilation |
publishDate |
2013 |
url |
http://hdl.handle.net/2078.1/129275 https://doi.org/10.1016/j.ocemod.2013.01.003 |
genre |
Amundsen Sea Antarc* Antarctic Bellingshausen Sea Ross Sea Sea ice Southern Ocean Weddell Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Bellingshausen Sea Ross Sea Sea ice Southern Ocean Weddell Sea |
op_source |
Ocean Modelling, Vol. 64, p. 67-75 (2013) |
op_relation |
boreal:129275 http://hdl.handle.net/2078.1/129275 doi:10.1016/j.ocemod.2013.01.003 urn:ISSN:1463-5003 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.ocemod.2013.01.003 |
container_title |
Ocean Modelling |
container_volume |
64 |
container_start_page |
67 |
op_container_end_page |
75 |
_version_ |
1799472605237870592 |