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Abstract:

In southern South America and for the period 1960-2011, frequencies and trends of seasonal blocking situations (Bs) determined at 100, 70 and 40° W (B100, B70 and B40), respectively are estimated. The effect of such situations on temperature and precipitation is also analyzed. The distribution of occurrences of B100, B70 and B40 peaks in spring and has minimum values in summer; trends are positive in summer and fall and negative in winter and spring. To the north of approximately 38° S, B70 determines negative temperature anomalies (DT) over the entire country during the four seasons and B40 in spring and summer. Except for summer, rainfall is greater than normal when Bs occur at both longitudes. To the south of approximately 38° S, B100 give place to negative δT. The frequencies and amounts of precipitation are greater in spring. This area is limited to the northernmost northern (southernmost southern) area in fall (summer). According to the signs of the trends of the Bs and to the associated values of temperature and precipitation, the way in which they may have contributed to the change in both variables during 1960-2011 is inferred.

Registro:

Documento: Artículo
Título:Incidence and trend of blocking action situations on the temperature and precipitation in Argentina
Autor:Alessandro, A.P.
Filiación:Departamento de Ciencias de la Atmósfera y los Océanos, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina
Palabras clave:Circulation change; Indices; Precipitation; Temperature; air temperature; atmospheric blocking; atmospheric circulation; precipitation (climatology); temperature anomaly; Argentina
Año:2014
Volumen:27
Número:2
Página de inicio:141
Página de fin:163
DOI: http://dx.doi.org/10.1016/S0187-6236(14)71106-3
Título revista:Atmosfera
Título revista abreviado:Atmosfera
ISSN:01876236
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01876236_v27_n2_p141_Alessandro

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Citas:

---------- APA ----------
(2014) . Incidence and trend of blocking action situations on the temperature and precipitation in Argentina. Atmosfera, 27(2), 141-163.
http://dx.doi.org/10.1016/S0187-6236(14)71106-3
---------- CHICAGO ----------
Alessandro, A.P. "Incidence and trend of blocking action situations on the temperature and precipitation in Argentina" . Atmosfera 27, no. 2 (2014) : 141-163.
http://dx.doi.org/10.1016/S0187-6236(14)71106-3
---------- MLA ----------
Alessandro, A.P. "Incidence and trend of blocking action situations on the temperature and precipitation in Argentina" . Atmosfera, vol. 27, no. 2, 2014, pp. 141-163.
http://dx.doi.org/10.1016/S0187-6236(14)71106-3
---------- VANCOUVER ----------
Alessandro, A.P. Incidence and trend of blocking action situations on the temperature and precipitation in Argentina. Atmosfera. 2014;27(2):141-163.
http://dx.doi.org/10.1016/S0187-6236(14)71106-3