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Abstract:

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.

Registro:

Documento: Artículo
Título:Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009
Autor:Barreira, S.; Compagnucci, R.H.
Filiación:Department of Meteorology, Argentine Naval Hydrographical Service, Comodoro Py 2055 Piso 15, 1104 Buenos Aires, Argentina
Atmospheric and Oceanography Science Department, University of Buenos Aires, Ciudad Universitaria, Pab. 2, Piso 2, 1428 Buenos Aires, Argentina
Palabras clave: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
Año:2011
Volumen:52
Número:57 PART 1
Página de inicio:140
Página de fin:150
DOI: http://dx.doi.org/10.3189/172756411795931741
Título revista:Annals of Glaciology
Título revista abreviado:Ann. Glaciol.
ISSN:02603055
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02603055_v52_n57PART1_p140_Barreira

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Citas:

---------- APA ----------
Barreira, S. & Compagnucci, R.H. (2011) . Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009. Annals of Glaciology, 52(57 PART 1), 140-150.
http://dx.doi.org/10.3189/172756411795931741
---------- CHICAGO ----------
Barreira, S., Compagnucci, R.H. "Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009" . Annals of Glaciology 52, no. 57 PART 1 (2011) : 140-150.
http://dx.doi.org/10.3189/172756411795931741
---------- MLA ----------
Barreira, S., Compagnucci, R.H. "Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009" . Annals of Glaciology, vol. 52, no. 57 PART 1, 2011, pp. 140-150.
http://dx.doi.org/10.3189/172756411795931741
---------- VANCOUVER ----------
Barreira, S., Compagnucci, R.H. Spatial fields of Antarctic sea-ice concentration anomalies for summer - Autumn and their relationship to Southern Hemisphere atmospheric circulation during the period 1979-2009. Ann. Glaciol. 2011;52(57 PART 1):140-150.
http://dx.doi.org/10.3189/172756411795931741