Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009
Summer-autumn monthly sea-ice concentration anomaly (SICA) fields in Antarctica obtained from satellite data for the period 1979-2009 were analysed with Varimax-rotated T-mode principal component analysis (PCA). The first three PCA scores described the SICA spatial behaviour and explained 38.07% of...
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ftunibueairesbd:paper:paper_02603055_v52_n57PART1_p140_Barreira 2023-05-15T13:50:11+02:00 Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02603055_v52_n57PART1_p140_Barreira https://hdl.handle.net/20.500.12110/paper_02603055_v52_n57PART1_p140_Barreira unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02603055_v52_n57PART1_p140_Barreira http://hdl.handle.net/20.500.12110/paper_02603055_v52_n57PART1_p140_Barreira air temperature atmospheric circulation ice cover principal component analysis satellite data sea ice seasonal variation Southern Hemisphere spatial analysis autumn summer Antarctic Peninsula Antarctica Pacific Ocean Southern Ocean West Antarctica Ross Sea Weddell Sea 2011 ftunibueairesbd https://doi.org/20.500.12110/paper_02603055_v52_n57PART1_p140_Barreira 2023-02-16T02:27:09Z Summer-autumn monthly sea-ice concentration anomaly (SICA) fields in Antarctica obtained from satellite data for the period 1979-2009 were analysed with Varimax-rotated T-mode principal component analysis (PCA). The first three PCA scores described the SICA spatial behaviour and explained 38.07% of the total variance. The related atmospheric circulation characteristics were analysed using 850 hPa height and surface air-temperature anomalies for the months clustered by the corresponding SICA composites, which were based on PCA loadings above a ±0.3 threshold. The principal characteristics of SICA can be seen between the Ross and Weddell Seas, areas that remained ice-covered during the analysis period. Elsewhere around Antarctica, small distinct characteristics occur mostly in embayments. The leading summer-autumn SICA pattern shows a structure with two centres of equal sign located one over the Weddell and the other over the Ross Sea-southwest Pacific Ocean sector and a centre of opposite sign over the Bellingshausen and Amundsen Seas. The second SICA pattern is represented by a dipóle over the Weddell Sea as a result of an increase (decrease) in sea-ice concentration in the northern sector (positive phase) and a decrease (increase) in the southern region, together with a positive (negative) centre over the Ross and Amundsen Seas. The latter pattern is characterized by equal-sign anomalies on both sides of the Antarctic Peninsula and opposite-sign centres all around Antarctica with the highest intensity over the Ross Sea. Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Southern Ocean Weddell Sea West Antarctica Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Antarctic Peninsula Pacific Ross Sea Southern Ocean The Antarctic Weddell Weddell Sea West Antarctica |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
air temperature atmospheric circulation ice cover principal component analysis satellite data sea ice seasonal variation Southern Hemisphere spatial analysis autumn summer Antarctic Peninsula Antarctica Pacific Ocean Southern Ocean West Antarctica Ross Sea Weddell Sea |
spellingShingle |
air temperature atmospheric circulation ice cover principal component analysis satellite data sea ice seasonal variation Southern Hemisphere spatial analysis autumn summer Antarctic Peninsula Antarctica Pacific Ocean Southern Ocean West Antarctica Ross Sea Weddell Sea Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 |
topic_facet |
air temperature atmospheric circulation ice cover principal component analysis satellite data sea ice seasonal variation Southern Hemisphere spatial analysis autumn summer Antarctic Peninsula Antarctica Pacific Ocean Southern Ocean West Antarctica Ross Sea Weddell Sea |
description |
Summer-autumn monthly sea-ice concentration anomaly (SICA) fields in Antarctica obtained from satellite data for the period 1979-2009 were analysed with Varimax-rotated T-mode principal component analysis (PCA). The first three PCA scores described the SICA spatial behaviour and explained 38.07% of the total variance. The related atmospheric circulation characteristics were analysed using 850 hPa height and surface air-temperature anomalies for the months clustered by the corresponding SICA composites, which were based on PCA loadings above a ±0.3 threshold. The principal characteristics of SICA can be seen between the Ross and Weddell Seas, areas that remained ice-covered during the analysis period. Elsewhere around Antarctica, small distinct characteristics occur mostly in embayments. The leading summer-autumn SICA pattern shows a structure with two centres of equal sign located one over the Weddell and the other over the Ross Sea-southwest Pacific Ocean sector and a centre of opposite sign over the Bellingshausen and Amundsen Seas. The second SICA pattern is represented by a dipóle over the Weddell Sea as a result of an increase (decrease) in sea-ice concentration in the northern sector (positive phase) and a decrease (increase) in the southern region, together with a positive (negative) centre over the Ross and Amundsen Seas. The latter pattern is characterized by equal-sign anomalies on both sides of the Antarctic Peninsula and opposite-sign centres all around Antarctica with the highest intensity over the Ross Sea. |
title |
Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 |
title_short |
Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 |
title_full |
Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 |
title_fullStr |
Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 |
title_full_unstemmed |
Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009 |
title_sort |
spatial fields of antarctic sea-ice concentration anomalies for summer - autumn and their relationship to southern hemisphere atmospheric circulation during the period 1979-2009 |
publishDate |
2011 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02603055_v52_n57PART1_p140_Barreira https://hdl.handle.net/20.500.12110/paper_02603055_v52_n57PART1_p140_Barreira |
geographic |
Antarctic Antarctic Peninsula Pacific Ross Sea Southern Ocean The Antarctic Weddell Weddell Sea West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Pacific Ross Sea Southern Ocean The Antarctic Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Southern Ocean Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Southern Ocean Weddell Sea West Antarctica |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02603055_v52_n57PART1_p140_Barreira http://hdl.handle.net/20.500.12110/paper_02603055_v52_n57PART1_p140_Barreira |
op_doi |
https://doi.org/20.500.12110/paper_02603055_v52_n57PART1_p140_Barreira |
_version_ |
1766253185681326080 |