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Abstract:

Daily precipitation data from three stations in subtropical Argentina are used to describe intraseasonal variability (20-90 days) during the austral summer. This variability is compared locally and regionally with that present in outgoing longwave radiation (OLR) data, in order to evaluate the performance of this variable as a proxy for convection in the region. The influence of the intraseasonal activity of the South American Seesaw (SASS) leading convection pattern on precipitation is also explored. Results show that intraseasonal variability explains a significant portion of summer precipitation variance, with a clear maximum in the vicinity of the SASS subtropical center. Correlation analysis reveals that OLR can explain only a small portion of daily precipitation variability, implying that it does not constitute a proper proxy for precipitation on daily timescales. On intraseasonal timescales, though, OLR is able to reproduce the main features of precipitation variability. The dynamical conditions that promote the development of intraseasonal variability in the region are further analyzed for selected summers. Seasons associated with a strong intraseasonal signal in precipitation variability show distinctive wet/dry intraseasonal periods in daily raw data, and are associated with a well defined SASS-like spatial pattern of convection. During these summers, strong large-scale forcing (such as warm El Niño/Southern Oscillation (ENSO) events and/or tropical intraseasonal convective activity), and Rossby-wave-like circulation anomalies extending across the Pacific Ocean, are also observed. © Springer-Verlag 2007.

Registro:

Documento: Artículo
Título:Intraseasonal variability in subtropical South America as depicted by precipitation data
Autor:González, P.L.M.; Vera, C.S.; Liebmann, B.; Kiladis, G.
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
CIRES Climate Diagnostics Center, Boulder, CO, United States
Earth System Research Laboratory, NOAA, Boulder, CO, United States
Palabras clave:Convection; Intraseasonal variability; Precipitation; South America; Warm season; atmospheric circulation; atmospheric convection; climate forcing; correlation; El Nino-Southern Oscillation; precipitation (climatology); Rossby wave; seasonal variation; spatial variation; summer; variance analysis; Pacific Ocean; South America
Año:2008
Volumen:30
Número:7-8
Página de inicio:727
Página de fin:744
DOI: http://dx.doi.org/10.1007/s00382-007-0319-9
Título revista:Climate Dynamics
Título revista abreviado:Clim. Dyn.
ISSN:09307575
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v30_n7-8_p727_Gonzalez

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Citas:

---------- APA ----------
González, P.L.M., Vera, C.S., Liebmann, B. & Kiladis, G. (2008) . Intraseasonal variability in subtropical South America as depicted by precipitation data. Climate Dynamics, 30(7-8), 727-744.
http://dx.doi.org/10.1007/s00382-007-0319-9
---------- CHICAGO ----------
González, P.L.M., Vera, C.S., Liebmann, B., Kiladis, G. "Intraseasonal variability in subtropical South America as depicted by precipitation data" . Climate Dynamics 30, no. 7-8 (2008) : 727-744.
http://dx.doi.org/10.1007/s00382-007-0319-9
---------- MLA ----------
González, P.L.M., Vera, C.S., Liebmann, B., Kiladis, G. "Intraseasonal variability in subtropical South America as depicted by precipitation data" . Climate Dynamics, vol. 30, no. 7-8, 2008, pp. 727-744.
http://dx.doi.org/10.1007/s00382-007-0319-9
---------- VANCOUVER ----------
González, P.L.M., Vera, C.S., Liebmann, B., Kiladis, G. Intraseasonal variability in subtropical South America as depicted by precipitation data. Clim. Dyn. 2008;30(7-8):727-744.
http://dx.doi.org/10.1007/s00382-007-0319-9