Artículo

Saulo, C.; Ferreira, L.; Nogués-Paegle, J.; Seluchi, M.; Ruiz, J. "Land-atmosphere interactions during a northwestern Argentina low event" (2010) Monthly Weather Review. 138(7):2481-2498
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Abstract:

The impact of changes in soil moisture in subtropical Argentina in rainfall distribution and low-level circulation is studied with a state-of-the-art regional model in a downscaling mode, with different scenarios of soil moisture for a 10-day period. The selected case (starting 29 January 2003) was characterized by a northwestern Argentina low event associated with well-defined low-level northerly flow that extended east of the Andes over subtropical latitudes. Four tests were conducted at 40-km horizontal resolution with 31 sigma levels, decreasing and increasing the soil moisture initial condition by 50% over the entire domain, and imposing a 50% reduction over northwest Argentina and 50% increase over southeast South America. A control run with NCEP/Global Data Assimilation System (GDAS) initial conditions was used to assess the impact of the different soil moisture configurations. It was found that land surface interactions are stronger when soil moisture is decreased, with a coherent reduction of precipitation over southern South America. Enhanced northerly winds result from an increase in the zonal gradient of pressure at low levels. In contrast, when soil moisture is increased, smaller circulation changes are found, although there appears to be a local feedback effect between the land and precipitation. The combined effects of changes in the circulation and in local stratification induced by soil wetness modifications, through variations in evaporation and Convective Available Potential Energy (CAPE), are in agreement with what has been found by other studies, resulting in coherent modifications of precipitation when variations of CAPE and moisture flux convergence mutually reinforce. © 2010 American Meteorological Society.

Registro:

Documento: Artículo
Título:Land-atmosphere interactions during a northwestern Argentina low event
Autor:Saulo, C.; Ferreira, L.; Nogués-Paegle, J.; Seluchi, M.; Ruiz, J.
Filiación:Departamento de Ciencias de la Atmósfera y los Océanos, Universidad de Buenos Aires, Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA), Buenos Aires, Argentina
Departamento de Ciencias de la Atmósfera y los Océanos, Universidad de Buenos Aires, Servicio Meteorológico Nacional, Buenos Aires, Argentina
Department of Meteorology, University of Utah, Salt Lake City, UT, United States
Centro de Previsao de Tempo e Estudos Climaticos (CPTEC)-INPE, Cachoeira Paulista, Brazil
Palabras clave:Argentina; Circulation changes; Combined effect; Convective available potential energies; Data assimilation systems; Down-scaling; Entire domain; Feedback effects; Horizontal resolution; Initial conditions; Land surface; Low level; Moisture flux convergences; Northwest Argentina; Rainfall distribution; Regional model; Soil wetness; South America; Subtropical latitudes; Data processing; Moisture determination; Rain; Soil moisture; Geologic models; atmospheric circulation; evaporation; moisture flux; precipitation (climatology); rainfall; soil moisture; wind; zonal flow; Andes; Argentina
Año:2010
Volumen:138
Número:7
Página de inicio:2481
Página de fin:2498
DOI: http://dx.doi.org/10.1175/2010MWR3227.1
Título revista:Monthly Weather Review
Título revista abreviado:Mon. Weather Rev.
ISSN:00270644
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00270644_v138_n7_p2481_Saulo

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Citas:

---------- APA ----------
Saulo, C., Ferreira, L., Nogués-Paegle, J., Seluchi, M. & Ruiz, J. (2010) . Land-atmosphere interactions during a northwestern Argentina low event. Monthly Weather Review, 138(7), 2481-2498.
http://dx.doi.org/10.1175/2010MWR3227.1
---------- CHICAGO ----------
Saulo, C., Ferreira, L., Nogués-Paegle, J., Seluchi, M., Ruiz, J. "Land-atmosphere interactions during a northwestern Argentina low event" . Monthly Weather Review 138, no. 7 (2010) : 2481-2498.
http://dx.doi.org/10.1175/2010MWR3227.1
---------- MLA ----------
Saulo, C., Ferreira, L., Nogués-Paegle, J., Seluchi, M., Ruiz, J. "Land-atmosphere interactions during a northwestern Argentina low event" . Monthly Weather Review, vol. 138, no. 7, 2010, pp. 2481-2498.
http://dx.doi.org/10.1175/2010MWR3227.1
---------- VANCOUVER ----------
Saulo, C., Ferreira, L., Nogués-Paegle, J., Seluchi, M., Ruiz, J. Land-atmosphere interactions during a northwestern Argentina low event. Mon. Weather Rev. 2010;138(7):2481-2498.
http://dx.doi.org/10.1175/2010MWR3227.1