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Abstract:

This paper evaluates a present climate simulation over southern South America performed with the Meteorological Research Institute/Japanese Meteorological Agency (MRI/JMA) high resolution global model. Main patterns of low and upper-level atmospheric circulation were analysed in a 25-year simulation as well as climate means, interannual variability, trends and bias of temperature and precipitation. The model is able to reproduce the main atmospheric circulation patterns and mean surface variables, although some deficiencies were found such as an overestimation of temperature over central Argentina in most of seasons, an overestimation of austral winter precipitation over northeastern and central Argentina, an underestimation of precipitation in all the seasons over southeast of Brazil, an underestimation of the amplitude of the annual cycle temperature in some regions and an overestimation of the amplitude of the annual cycle of precipitation over mountainous areas. Model interannual variability was also assessed. In general, temperature variability is overestimated, whereas precipitation is underestimated. The spatial structure of the year-to-year variability of precipitation is correctly simulated by the model, although some patterns were misplaced. Most of regions present a cold seasonal bias reaching values of - 2 °C in some regions. It was found that precipitation biases are between 3 and - 1 mm day-1. In some regions and seasons observed and simulated temperature trends coincide, as in austral summer or spring, where the model and the observations show positive trends in most of regions. However, there is no agreement between observed and simulated precipitation trends in almost all the regions and seasons. © 2012 Royal Meteorological Society.

Registro:

Documento: Artículo
Título:Performance of a high resolution global model over southern South America
Autor:Blázquez, J.; Nuñez, M.N.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CIMA-CONICET/FCEN-UBA), Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA), Instituto Franco Argentino del Clima y sus Impactos (UMI IFAECI/CNRS), Ciudad Universitaria, Buenos Aires, Argentina
Palabras clave:Global model; Present climate; Southern South America; Validation; Annual cycle; Argentina; Atmospheric circulation; Atmospheric circulation patterns; Austral summers; Austral winter; Climate simulation; Global models; High resolution; Interannual variability; Meteorological agency; Meteorological research institutes; Mountainous area; Precipitation trends; Present climate; Southern south america; Spatial structure; Surface variables; Temperature trends; Temperature variability; Validation; Climatology; Computer simulation; Lasers; Space applications; Climate models; air temperature; annual variation; atmospheric circulation; climate modeling; global climate; numerical model; performance assessment; precipitation assessment; trend analysis; Argentina; Brazil
Año:2013
Volumen:33
Número:4
Página de inicio:904
Página de fin:919
DOI: http://dx.doi.org/10.1002/joc.3478
Handle:http://hdl.handle.net/20.500.12110/paper_08998418_v33_n4_p904_Blazquez
Título revista:International Journal of Climatology
Título revista abreviado:Int. J. Climatol.
ISSN:08998418
CODEN:IJCLE
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_08998418_v33_n4_p904_Blazquez.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v33_n4_p904_Blazquez

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Citas:

---------- APA ----------
Blázquez, J. & Nuñez, M.N. (2013) . Performance of a high resolution global model over southern South America. International Journal of Climatology, 33(4), 904-919.
http://dx.doi.org/10.1002/joc.3478
---------- CHICAGO ----------
Blázquez, J., Nuñez, M.N. "Performance of a high resolution global model over southern South America" . International Journal of Climatology 33, no. 4 (2013) : 904-919.
http://dx.doi.org/10.1002/joc.3478
---------- MLA ----------
Blázquez, J., Nuñez, M.N. "Performance of a high resolution global model over southern South America" . International Journal of Climatology, vol. 33, no. 4, 2013, pp. 904-919.
http://dx.doi.org/10.1002/joc.3478
---------- VANCOUVER ----------
Blázquez, J., Nuñez, M.N. Performance of a high resolution global model over southern South America. Int. J. Climatol. 2013;33(4):904-919.
http://dx.doi.org/10.1002/joc.3478