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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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 |
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Open Polar |
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Copernicus Publications: E-Journals |
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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 |
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17 |
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2 |
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701 |
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717 |
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1766109879439720448 |