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Abstract:

The paper concentrates on the analysis of the interannual variability of wintertime rainfall in the Southern Andes. Besides the socio-economic relevance of the region, mainly associated with hydroelectric energy production, the study of the climate variability in that area has not received as much attention as others along the Andes. The results show that winter rainfall explains the largest percentage of regional total annuals. A principal component analysis (PCA) of the winter rainfall anomalies showed that the regional year-to-year variability is mostly explained by three leading patterns. While one of them is significantly associated with both the El Niño Southern Oscillation (ENSO), and the Southern Annular Mode (SAM), the other two patterns are significantly related to interannual changes of the sea surface temperature (SST) anomalies in the tropical Indian Ocean. Specifically, changes in the ocean surface conditions at both tropical basins induce in the atmospheric circulation the generation of Rossby wave trains that extend along the South Pacific towards South America, and alter the circulation at the region under study. The relationship between variability in the Indian Ocean and the Andes climate variability has not been previously addressed. Therefore, this result makes a significant contribution to the identification of the sources of predictability in South America with relevant consequences for future applications in seasonal predictions. © 2009 Royal Meteorological Society.

Registro:

Documento: Artículo
Título:On the interannual wintertime rainfall variability in the Southern Andes
Autor:González, M.H.; Vera, C.S.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA), Departamento de Ciencias de la Atmósfera y los Océanos, FCEyN, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:El niño southern oscillation; Indian ocean; Interannual variability; Southern andes; Southern annular mode; Atmospheric circulation; Climate variability; Future applications; Hydroelectric energy production; Indian ocean; Interannual; Interannual variability; Ocean surfaces; Rossby wave; Sea surface temperature anomalies; Seasonal prediction; Socio-economics; South America; Southern Annular Mode; Southern Oscillation; Tropical Indian ocean; Winter rainfall; Wintertime rainfall; Atmospheric pressure; Atmospheric temperature; Climate change; Financial data processing; Locomotives; Nickel compounds; Ocean currents; Railroad cars; Rain; Surface waters; Principal component analysis; annual variation; atmospheric circulation; climate variation; El Nino-Southern Oscillation; precipitation assessment; principal component analysis; rainfall; Rossby wave; sea surface temperature; winter; Andes; Indian Ocean; Indian Ocean (Tropical)
Año:2010
Volumen:30
Número:5
Página de inicio:643
Página de fin:657
DOI: http://dx.doi.org/10.1002/joc.1910
Título revista:International Journal of Climatology
Título revista abreviado:Int. J. Climatol.
ISSN:08998418
CODEN:IJCLE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v30_n5_p643_Gonzalez

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Citas:

---------- APA ----------
González, M.H. & Vera, C.S. (2010) . On the interannual wintertime rainfall variability in the Southern Andes. International Journal of Climatology, 30(5), 643-657.
http://dx.doi.org/10.1002/joc.1910
---------- CHICAGO ----------
González, M.H., Vera, C.S. "On the interannual wintertime rainfall variability in the Southern Andes" . International Journal of Climatology 30, no. 5 (2010) : 643-657.
http://dx.doi.org/10.1002/joc.1910
---------- MLA ----------
González, M.H., Vera, C.S. "On the interannual wintertime rainfall variability in the Southern Andes" . International Journal of Climatology, vol. 30, no. 5, 2010, pp. 643-657.
http://dx.doi.org/10.1002/joc.1910
---------- VANCOUVER ----------
González, M.H., Vera, C.S. On the interannual wintertime rainfall variability in the Southern Andes. Int. J. Climatol. 2010;30(5):643-657.
http://dx.doi.org/10.1002/joc.1910