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Abstract:

A high pressure system between 20°S and 35°S, moving from east to west, passed over the Andes mountains on 27 and 28 February 1997. Some days earlier, on 20 February, another centre of anticyclonic vorticity bad moved westward without crossing the Andes. These events developed during a South American Seesaw System (SASS) event that had been displaced southward from its climatological position. This southward di splacement of the local circulation pattern was accompanied by intense convective activity during the positive phase of the event, which favoured the development of strong storms in north and central Argentina. The unusual configuration of the motion field gave rise to atypically high temperatures in the mid-latitude Argentinian region. Both anticyclonic systems reached the mountain barrier: one fro m the north and the other from the south. The analysis of the factors involved in this phenomenon reveals that the static stability in each system behaved differently near the mountain barrier. Advection of potential vorticity was responsible for the westward motion of the system, while the radiative processes influenced the production of cyclonic and anticyclonic potential vorticity which balanced out during each day.

Registro:

Documento: Artículo
Título:Evolution of South American high pressure systems during late summer 1997
Autor:Cerne, S.B.; Possia, N.E.
Filiación:CIMA, Depto. Ciencias de Atmosfera/Oceanos, Universidad de Buenos Aires, Pab. II, Buenos Aires, Argentina
Año:2004
Volumen:11
Número:4
Página de inicio:329
Página de fin:341
DOI: http://dx.doi.org/10.1017/S1350482704001410
Título revista:Meteorological Applications
Título revista abreviado:Meteorol. Appl.
ISSN:13504827
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13504827_v11_n4_p329_Cerne

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Citas:

---------- APA ----------
Cerne, S.B. & Possia, N.E. (2004) . Evolution of South American high pressure systems during late summer 1997. Meteorological Applications, 11(4), 329-341.
http://dx.doi.org/10.1017/S1350482704001410
---------- CHICAGO ----------
Cerne, S.B., Possia, N.E. "Evolution of South American high pressure systems during late summer 1997" . Meteorological Applications 11, no. 4 (2004) : 329-341.
http://dx.doi.org/10.1017/S1350482704001410
---------- MLA ----------
Cerne, S.B., Possia, N.E. "Evolution of South American high pressure systems during late summer 1997" . Meteorological Applications, vol. 11, no. 4, 2004, pp. 329-341.
http://dx.doi.org/10.1017/S1350482704001410
---------- VANCOUVER ----------
Cerne, S.B., Possia, N.E. Evolution of South American high pressure systems during late summer 1997. Meteorol. Appl. 2004;11(4):329-341.
http://dx.doi.org/10.1017/S1350482704001410