Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration
The observed relationships between anomalous Antarctic sea ice concentration (SIC) and the leading patterns of Southern Hemisphere (SH) large-scale climate variability are examined as a function of season over 1980–2008. Particular emphasis is placed on 1) the interactions between SIC, the southern...
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American Meteorological Soc
2012
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_41984 2024-05-12T07:54:33+00:00 Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration Simpkins, GR Ciasto, L Thompson, DW England, MH 2012 http://hdl.handle.net/1959.4/unsworks_41984 https://doi.org/10.1175/JCLI-D-11-00367.1 unknown American Meteorological Soc http://purl.org/au-research/grants/arc/FL100100214 http://hdl.handle.net/1959.4/unsworks_41984 https://doi.org/10.1175/JCLI-D-11-00367.1 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ urn:ISSN:0894-8755 urn:ISSN:1520-0442 Journal of Climate, 25, 16, 5451-5469 13 Climate Action anzsrc-for: 040105 Climatology (excl. Climate Change Processes) anzsrc-for: 040104 Climate Change Processes anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering journal article http://purl.org/coar/resource_type/c_6501 2012 ftunswworks https://doi.org/10.1175/JCLI-D-11-00367.1 2024-04-17T15:02:21Z The observed relationships between anomalous Antarctic sea ice concentration (SIC) and the leading patterns of Southern Hemisphere (SH) large-scale climate variability are examined as a function of season over 1980–2008. Particular emphasis is placed on 1) the interactions between SIC, the southern annular mode (SAM), and El Niño–Southern Oscillation (ENSO); and 2) the contribution of these two leading modes to the 29-yr trends in sea ice. Regression, composite, and principal component analyses highlight a seasonality in SH sea ice–atmosphere interactions, whereby Antarctic sea ice variability exhibits the strongest linkages to the SAM and ENSO during the austral cold season months. As noted in previous work, a dipole in SIC anomalies emerges in relation to the SAM, characterized by centers of action located near the Bellingshausen/Weddell and Amundsen/eastern Ross Seas. The structure and magnitude of this SIC dipole is found to vary considerably as a function of season, consistent with the seasonality of the overlying atmospheric circulation anomalies. Relative to the SAM, the pattern of sea ice anomalies linked to ENSO exhibits a similar seasonality but tends to be weaker in amplitude and more diffuse in structure. The relationships between ENSO and sea ice also exhibit a substantial nonlinear component, highlighting the need to consider both season and phase of the ENSO cycle when diagnosing ENSO–SIC linkages. Trends in SIC over 1980–2008 are not significantly related to trends in either the SAM or ENSO during any season, including austral summer when the trend in the SAM is most pronounced. Article in Journal/Newspaper Antarc* Antarctic Sea ice UNSW Sydney (The University of New South Wales): UNSWorks Antarctic Austral Weddell Journal of Climate 25 16 5451 5469 |
institution |
Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
13 Climate Action anzsrc-for: 040105 Climatology (excl. Climate Change Processes) anzsrc-for: 040104 Climate Change Processes anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering |
spellingShingle |
13 Climate Action anzsrc-for: 040105 Climatology (excl. Climate Change Processes) anzsrc-for: 040104 Climate Change Processes anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering Simpkins, GR Ciasto, L Thompson, DW England, MH Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration |
topic_facet |
13 Climate Action anzsrc-for: 040105 Climatology (excl. Climate Change Processes) anzsrc-for: 040104 Climate Change Processes anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering |
description |
The observed relationships between anomalous Antarctic sea ice concentration (SIC) and the leading patterns of Southern Hemisphere (SH) large-scale climate variability are examined as a function of season over 1980–2008. Particular emphasis is placed on 1) the interactions between SIC, the southern annular mode (SAM), and El Niño–Southern Oscillation (ENSO); and 2) the contribution of these two leading modes to the 29-yr trends in sea ice. Regression, composite, and principal component analyses highlight a seasonality in SH sea ice–atmosphere interactions, whereby Antarctic sea ice variability exhibits the strongest linkages to the SAM and ENSO during the austral cold season months. As noted in previous work, a dipole in SIC anomalies emerges in relation to the SAM, characterized by centers of action located near the Bellingshausen/Weddell and Amundsen/eastern Ross Seas. The structure and magnitude of this SIC dipole is found to vary considerably as a function of season, consistent with the seasonality of the overlying atmospheric circulation anomalies. Relative to the SAM, the pattern of sea ice anomalies linked to ENSO exhibits a similar seasonality but tends to be weaker in amplitude and more diffuse in structure. The relationships between ENSO and sea ice also exhibit a substantial nonlinear component, highlighting the need to consider both season and phase of the ENSO cycle when diagnosing ENSO–SIC linkages. Trends in SIC over 1980–2008 are not significantly related to trends in either the SAM or ENSO during any season, including austral summer when the trend in the SAM is most pronounced. |
format |
Article in Journal/Newspaper |
author |
Simpkins, GR Ciasto, L Thompson, DW England, MH |
author_facet |
Simpkins, GR Ciasto, L Thompson, DW England, MH |
author_sort |
Simpkins, GR |
title |
Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration |
title_short |
Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration |
title_full |
Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration |
title_fullStr |
Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration |
title_full_unstemmed |
Seasonal relationships between large-scale climate variability and Antarctic Sea ice concentration |
title_sort |
seasonal relationships between large-scale climate variability and antarctic sea ice concentration |
publisher |
American Meteorological Soc |
publishDate |
2012 |
url |
http://hdl.handle.net/1959.4/unsworks_41984 https://doi.org/10.1175/JCLI-D-11-00367.1 |
geographic |
Antarctic Austral Weddell |
geographic_facet |
Antarctic Austral Weddell |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
urn:ISSN:0894-8755 urn:ISSN:1520-0442 Journal of Climate, 25, 16, 5451-5469 |
op_relation |
http://purl.org/au-research/grants/arc/FL100100214 http://hdl.handle.net/1959.4/unsworks_41984 https://doi.org/10.1175/JCLI-D-11-00367.1 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1175/JCLI-D-11-00367.1 |
container_title |
Journal of Climate |
container_volume |
25 |
container_issue |
16 |
container_start_page |
5451 |
op_container_end_page |
5469 |
_version_ |
1798850227343458304 |