Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble
The yearly paired process of slow growth and rapid melt of some 15 million square kilometers of Antarctic sea ice takes place with a regular asymmetry; the process has been linked to the relationship of the position of the ice edge with the band of low pressure that circles the continent between 60°...
Published in: | Annals of Glaciology |
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Cambridge University Press
2020
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Online Access: | https://doi.org/10.1017/aog.2020.26 https://doaj.org/article/468f68838a6b4c0c8e6aa5dd515b0c8f |
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ftdoajarticles:oai:doaj.org/article:468f68838a6b4c0c8e6aa5dd515b0c8f 2023-05-15T13:29:32+02:00 Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble Clare Eayrs Daiane Faller David M. Holland 2020-09-01T00:00:00Z https://doi.org/10.1017/aog.2020.26 https://doaj.org/article/468f68838a6b4c0c8e6aa5dd515b0c8f EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305520000269/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.26 0260-3055 1727-5644 https://doaj.org/article/468f68838a6b4c0c8e6aa5dd515b0c8f Annals of Glaciology, Vol 61, Pp 171-180 (2020) Ice/atmosphere interactions sea ice sea-ice growth and decay Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/aog.2020.26 2023-03-12T01:31:55Z The yearly paired process of slow growth and rapid melt of some 15 million square kilometers of Antarctic sea ice takes place with a regular asymmetry; the process has been linked to the relationship of the position of the ice edge with the band of low pressure that circles the continent between 60° and 70°S. In autumn, winds to the north of the low-pressure band slow the advancing ice edge. In summer, Ekman divergence created by opposing winds on either side of the low-pressure band opens up warm water regions that rapidly melt sea ice. We use the 40 ensemble members from the CESM-LENS historical run (1920–2005) to examine the relationship between the asymmetry in the annual cycle and the position and intensity of the low-pressure band. CESM-LENS reproduces the magnitude of the annual cycle of Antarctic sea ice extent with a short lag (2 weeks). Melt rate is the characteristic of the annual cycle that varies the most. Our results provide evidence that lower pressure leads to increased melt rates, which supports the importance of the role of divergence in increasing the melt rate of Antarctic sea ice. The role of winds during the growing season remains unquantified. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Annals of Glaciology 61 82 171 180 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice/atmosphere interactions sea ice sea-ice growth and decay Meteorology. Climatology QC851-999 |
spellingShingle |
Ice/atmosphere interactions sea ice sea-ice growth and decay Meteorology. Climatology QC851-999 Clare Eayrs Daiane Faller David M. Holland Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble |
topic_facet |
Ice/atmosphere interactions sea ice sea-ice growth and decay Meteorology. Climatology QC851-999 |
description |
The yearly paired process of slow growth and rapid melt of some 15 million square kilometers of Antarctic sea ice takes place with a regular asymmetry; the process has been linked to the relationship of the position of the ice edge with the band of low pressure that circles the continent between 60° and 70°S. In autumn, winds to the north of the low-pressure band slow the advancing ice edge. In summer, Ekman divergence created by opposing winds on either side of the low-pressure band opens up warm water regions that rapidly melt sea ice. We use the 40 ensemble members from the CESM-LENS historical run (1920–2005) to examine the relationship between the asymmetry in the annual cycle and the position and intensity of the low-pressure band. CESM-LENS reproduces the magnitude of the annual cycle of Antarctic sea ice extent with a short lag (2 weeks). Melt rate is the characteristic of the annual cycle that varies the most. Our results provide evidence that lower pressure leads to increased melt rates, which supports the importance of the role of divergence in increasing the melt rate of Antarctic sea ice. The role of winds during the growing season remains unquantified. |
format |
Article in Journal/Newspaper |
author |
Clare Eayrs Daiane Faller David M. Holland |
author_facet |
Clare Eayrs Daiane Faller David M. Holland |
author_sort |
Clare Eayrs |
title |
Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble |
title_short |
Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble |
title_full |
Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble |
title_fullStr |
Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble |
title_full_unstemmed |
Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble |
title_sort |
mechanisms driving the asymmetric seasonal cycle of antarctic sea ice in the cesm large ensemble |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/aog.2020.26 https://doaj.org/article/468f68838a6b4c0c8e6aa5dd515b0c8f |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Annals of Glaciology Antarc* Antarctic Sea ice |
genre_facet |
Annals of Glaciology Antarc* Antarctic Sea ice |
op_source |
Annals of Glaciology, Vol 61, Pp 171-180 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305520000269/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.26 0260-3055 1727-5644 https://doaj.org/article/468f68838a6b4c0c8e6aa5dd515b0c8f |
op_doi |
https://doi.org/10.1017/aog.2020.26 |
container_title |
Annals of Glaciology |
container_volume |
61 |
container_issue |
82 |
container_start_page |
171 |
op_container_end_page |
180 |
_version_ |
1766001152436994048 |