Un caso de baja segregada en niveles altos en el sur de Sudamérica: descripción del ciclo de vida y su relación con la precipitación

AUTOR(ES)
FONTE

Revista Brasileira de Meteorologia

DATA DE PUBLICAÇÃO

2011-09

RESUMO

This paper describes the life cycle of a high level cut-off cyclonic vortex that affected southern South America between 26 March and 2 April 2007, and explores the relationship between the evolution stages of the system and the rainfall over central Argentina. The possibility of other processes contributing to rainfall is also analyzed. The most relevant characteristics of this system were its length and slow displacement: from its development to decay it moved only 780 km. During its segregation and mature stages, it remained stationary for over 56 hours along the coast of central Chile. This latter feature favored the establishment of a low pressure system in the northwest of Argentina and the persistence of a northerly low level jet, from the center of Bolivia to the north of Argentina. The air mass with tropical characteristics driven by this system and the low-level convergence contributed to the development of convection. Accumulated rainfall during those stages, in some regions of central eastern Argentina was above 300 mm, producing significant flooding in the region. During the decay phase (96 hours duration), the system weakened as it moved eastward and precipitation affected the provinces of central-western Argentina, where the 48 h rain was twice the monthly average for March.

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