Intraseasonal variability in South America during the cold season

Intraseasonal (IS) variability in South America is analyzed during the cold season using 10-90 day bandpass filtered OLR anomalies (FOLR). IS variability explains a large percentage of variance with maximum values over Paraguay, northeastern Argentina, and southern Brazil. The leading pattern of FOL...

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Autor principal: Alvarez, M.S
Otros Autores: Vera, C.S, Kiladis, G.N, Liebmann, B.
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Lenguaje:Inglés
Publicado: Springer Verlag 2014
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100 1 |a Alvarez, M.S. 
245 1 0 |a Intraseasonal variability in South America during the cold season 
260 |b Springer Verlag  |c 2014 
270 1 0 |m Alvarez, M. S.; Centro de Investigaciones del Mar y la Atmósfera, (CIMA/CONICET-UBA), DCAO/FCEN, UMI-IFAECI/CNRS, Buenos Aires, Argentina; email: alvarez@cima.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a Intraseasonal (IS) variability in South America is analyzed during the cold season using 10-90 day bandpass filtered OLR anomalies (FOLR). IS variability explains a large percentage of variance with maximum values over Paraguay, northeastern Argentina, and southern Brazil. The leading pattern of FOLR, as isolated from an EOF analysis, (Cold Season IS pattern, CSIS), is characterized by a monopole centered over southeastern South America (SESA) with a northwest-southeast orientation. CSIS induces a large modulation on daily precipitation anomalies, especially on both wet spells and daily precipitation extremes, which are favored during positive (wet) CSIS phases. Large-Scale OLR anomalies over the tropical Indian and west Pacific Oceans associated with CSIS exhibit eastward propagation along tropical latitudes. In addition, circulation anomalies in the Southern Hemisphere reveal the presence of an anticyclonic anomaly over Antarctica with opposite-sign anomalies in middle latitudes 10 days before CSIS is maximum as well as evidence of Rossby wave-like patterns. Positive precipitation anomalies in SESA are favored during wet CSIS phases by the intensification of a cyclonic anomaly located further south, which is discernible over the southeastern Pacific for at least 14 days before CSIS peaks. The cyclonic anomaly evolution is accompanied by the intensification of an upstream anticyclonic anomaly, which remains quasi-stationary near the Antarctica Peninsula before the CSIS peak. We speculate that the stationary behavior of the anticyclonic center is favored by a hemispheric circulation anomaly pattern resembling that associated with a negative southern annular mode phase and a wavenumber 3-4 pattern at middle latitudes. © 2013 Springer-Verlag Berlin Heidelberg.  |l eng 
593 |a Centro de Investigaciones del Mar y la Atmósfera, (CIMA/CONICET-UBA), DCAO/FCEN, UMI-IFAECI/CNRS, Buenos Aires, Argentina 
593 |a Earth System Research Laboratory, NOAA, Boulder, CO, United States 
593 |a University of Colorado, CIRES, Boulder, CO, United States 
690 1 0 |a INTRASEASONAL VARIABILITY 
690 1 0 |a OUTGOING LONGWAVE RADIATION 
690 1 0 |a WINTER 
690 1 0 |a ANTICYCLONE 
690 1 0 |a LONGWAVE RADIATION 
690 1 0 |a PRECIPITATION ASSESSMENT 
690 1 0 |a ROSSBY WAVE 
690 1 0 |a SEASONAL VARIATION 
690 1 0 |a SOUTHERN HEMISPHERE 
690 1 0 |a WINTER 
690 1 0 |a ANTARCTIC PENINSULA 
690 1 0 |a ANTARCTICA 
690 1 0 |a BRAZIL 
690 1 0 |a INDIAN OCEAN 
690 1 0 |a INDIAN OCEAN (TROPICAL) 
690 1 0 |a PACIFIC OCEAN 
690 1 0 |a PACIFIC OCEAN (WEST) 
690 1 0 |a WEST ANTARCTICA 
651 4 |a SOUTH AMERICA 
651 4 |a ARGENTINA 
651 4 |a PARAGUAY 
700 1 |a Vera, C.S. 
700 1 |a Kiladis, G.N. 
700 1 |a Liebmann, B. 
773 0 |d Springer Verlag, 2014  |g v. 42  |h pp. 3253-3269  |k n. 11-12  |p Clim. Dyn.  |x 09307575  |w (AR-BaUEN)CENRE-567  |t Climate Dynamics 
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