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Abstract:

The seasonal cycle of the intraseasonal (IS) variability of precipitation in South America is described through the analysis of bandpass filtered outgoing longwave radiation (OLR) anomalies. The analysis is discriminated between short (10–30 days) and long (30–90 days) intraseasonal timescales. The seasonal cycle of the 30–90-day IS variability can be well described by the activity of first leading pattern (EOF1) computed separately for the wet season (October–April) and the dry season (May–September). In agreement with previous works, the EOF1 spatial distribution during the wet season is that of a dipole with centers of actions in the South Atlantic Convergence Zone (SACZ) and southeastern South America (SESA), while during the dry season, only the last center is discernible. In both seasons, the pattern is highly influenced by the activity of the Madden–Julian Oscillation (MJO). Moreover, EOF1 is related with a tropical zonal-wavenumber-1 structure superposed with coherent wave trains extended along the South Pacific during the wet season, while during the dry season the wavenumber-1 structure is not observed. The 10–30-day IS variability of OLR in South America can be well represented by the activity of the EOF1 computed through considering all seasons together, a dipole but with the stronger center located over SESA. While the convection activity at the tropical band does not seem to influence its activity, there are evidences that the atmospheric variability at subtropical-extratropical regions might have a role. Subpolar wavetrains are observed in the Pacific throughout the year and less intense during DJF, while a path of wave energy dispersion along a subtropical wavetrain also characterizes the other seasons. Further work is needed to identify the sources of the 10–30-day-IS variability in South America. © 2017, Springer-Verlag GmbH Germany.

Registro:

Documento: Artículo
Título:Seasonal cycle of precipitation variability in South America on intraseasonal timescales
Autor:Vera, C.S.; Alvarez, M.S.; Gonzalez, P.L.M.; Liebmann, B.; Kiladis, G.N.
Filiación:Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Centro de Investigaciones del Mar y la Atmósfera (CIMA), Instituto Franco-Argentino del Clima y sus Impactos (UMI-IFAECI)/CNRS, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
Department of Meteorology, University of Reading, Reading, United Kingdom
National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom
CIRES, University of Colorado Boulder, Boulder, CO, United States
Physical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States
Palabras clave:OLR; SACZ; Subseasonal; Teleconnections; longwave radiation; Madden-Julian oscillation; precipitation (climatology); seasonal variation; spatial distribution; teleconnection; South America
Año:2018
Volumen:51
Número:5-6
Página de inicio:1991
Página de fin:2001
DOI: http://dx.doi.org/10.1007/s00382-017-3994-1
Título revista:Climate Dynamics
Título revista abreviado:Clim. Dyn.
ISSN:09307575
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v51_n5-6_p1991_Vera

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Citas:

---------- APA ----------
Vera, C.S., Alvarez, M.S., Gonzalez, P.L.M., Liebmann, B. & Kiladis, G.N. (2018) . Seasonal cycle of precipitation variability in South America on intraseasonal timescales. Climate Dynamics, 51(5-6), 1991-2001.
http://dx.doi.org/10.1007/s00382-017-3994-1
---------- CHICAGO ----------
Vera, C.S., Alvarez, M.S., Gonzalez, P.L.M., Liebmann, B., Kiladis, G.N. "Seasonal cycle of precipitation variability in South America on intraseasonal timescales" . Climate Dynamics 51, no. 5-6 (2018) : 1991-2001.
http://dx.doi.org/10.1007/s00382-017-3994-1
---------- MLA ----------
Vera, C.S., Alvarez, M.S., Gonzalez, P.L.M., Liebmann, B., Kiladis, G.N. "Seasonal cycle of precipitation variability in South America on intraseasonal timescales" . Climate Dynamics, vol. 51, no. 5-6, 2018, pp. 1991-2001.
http://dx.doi.org/10.1007/s00382-017-3994-1
---------- VANCOUVER ----------
Vera, C.S., Alvarez, M.S., Gonzalez, P.L.M., Liebmann, B., Kiladis, G.N. Seasonal cycle of precipitation variability in South America on intraseasonal timescales. Clim. Dyn. 2018;51(5-6):1991-2001.
http://dx.doi.org/10.1007/s00382-017-3994-1