Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode

Across the long-term ( ∼43 -year) satellite record, Antarctic sea ice extent shows a small overall circumpolar increase, resulting from opposing regional sea ice concentration anomalies. Running short-term samples of the same sea ice concentration data, however, show that the long-term trend pattern...

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Published in:The Cryosphere
Main Authors: Schroeter, Serena, O'Kane, Terence J., Sandery, Paul A.
Format: Text
Language:English
Published: 2023
Subjects:
Online Access:https://doi.org/10.5194/tc-17-701-2023
https://tc.copernicus.org/articles/17/701/2023/
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spelling ftcopernicus:oai:publications.copernicus.org:tc105281 2023-05-15T13:38:41+02:00 Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode Schroeter, Serena O'Kane, Terence J. Sandery, Paul A. 2023-02-13 application/pdf https://doi.org/10.5194/tc-17-701-2023 https://tc.copernicus.org/articles/17/701/2023/ eng eng doi:10.5194/tc-17-701-2023 https://tc.copernicus.org/articles/17/701/2023/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-17-701-2023 2023-02-20T17:22:57Z Across the long-term ( ∼43 -year) satellite record, Antarctic sea ice extent shows a small overall circumpolar increase, resulting from opposing regional sea ice concentration anomalies. Running short-term samples of the same sea ice concentration data, however, show that the long-term trend pattern is dominated by the earliest years of the satellite record. Compensating regional anomalies diminish over time, and in the most recent decade, these tend towards spatial homogeneity instead. Running 30-year trends show the regional pattern of sea ice behaviour reversing over time; while in some regions, trend patterns abruptly shift in line with the record anomalous sea ice behaviour of recent years, in other regions a steady change predates these record anomalies. The shifting trend patterns in many regions are co-located with enhanced north–south flow due to an increasingly wave-3-like structure of the Southern Annular Mode. Sea surface temperature anomalies also shift from a circumpolar cooling to a regional pattern that resembles the increasingly asymmetric structure of the Southern Annular Mode, with warming in regions of previously increasing sea ice such as the Ross Sea. Text Antarc* Antarctic Ross Sea Sea ice Copernicus Publications: E-Journals Antarctic Ross Sea The Cryosphere 17 2 701 717
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description Across the long-term ( ∼43 -year) satellite record, Antarctic sea ice extent shows a small overall circumpolar increase, resulting from opposing regional sea ice concentration anomalies. Running short-term samples of the same sea ice concentration data, however, show that the long-term trend pattern is dominated by the earliest years of the satellite record. Compensating regional anomalies diminish over time, and in the most recent decade, these tend towards spatial homogeneity instead. Running 30-year trends show the regional pattern of sea ice behaviour reversing over time; while in some regions, trend patterns abruptly shift in line with the record anomalous sea ice behaviour of recent years, in other regions a steady change predates these record anomalies. The shifting trend patterns in many regions are co-located with enhanced north–south flow due to an increasingly wave-3-like structure of the Southern Annular Mode. Sea surface temperature anomalies also shift from a circumpolar cooling to a regional pattern that resembles the increasingly asymmetric structure of the Southern Annular Mode, with warming in regions of previously increasing sea ice such as the Ross Sea.
format Text
author Schroeter, Serena
O'Kane, Terence J.
Sandery, Paul A.
spellingShingle Schroeter, Serena
O'Kane, Terence J.
Sandery, Paul A.
Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode
author_facet Schroeter, Serena
O'Kane, Terence J.
Sandery, Paul A.
author_sort Schroeter, Serena
title Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode
title_short Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode
title_full Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode
title_fullStr Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode
title_full_unstemmed Antarctic sea ice regime shift associated with decreasing zonal symmetry in the Southern Annular Mode
title_sort antarctic sea ice regime shift associated with decreasing zonal symmetry in the southern annular mode
publishDate 2023
url https://doi.org/10.5194/tc-17-701-2023
https://tc.copernicus.org/articles/17/701/2023/
geographic Antarctic
Ross Sea
geographic_facet Antarctic
Ross Sea
genre Antarc*
Antarctic
Ross Sea
Sea ice
genre_facet Antarc*
Antarctic
Ross Sea
Sea ice
op_source eISSN: 1994-0424
op_relation doi:10.5194/tc-17-701-2023
https://tc.copernicus.org/articles/17/701/2023/
op_doi https://doi.org/10.5194/tc-17-701-2023
container_title The Cryosphere
container_volume 17
container_issue 2
container_start_page 701
op_container_end_page 717
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