Interacoes entre sistemas frontais na America do Sul e a conveccao na Amazonia / x

AUTOR(ES)
DATA DE PUBLICAÇÃO

1986

RESUMO

GOES-EAST satellite imagery for a ten-year period (1975 to 1984) was analysed in order to establish a climatology of the interaction between frontal systems and tropical convections mainly over the Amazon basin. The climatology revealed that often when frontal systems are located along the Atlantic coast in latitudinal band 35° - 20°S, there was a band of convective clouds associated with the frontal system extending from Amazon through Central Brazil and linked to the frontal cloudiness over the ocean. This type of association occurs more frequently when continental tropical convection is strong, mainly for the period from October through March for frontal systems in the latitudes 35 25°S and for the period from November through March for frontal systems between 25 20° S. Wind and temperature grid-point data were used for several levels in several periods selected. It was seen that organization and enhancement of convective cloudiness happens predominantly when the trough associated with the frontal system in tilted towards the northwest in the subtropical latitudes of South America, accompanied by both strong cold air advection at the lower levels and subsidence in a region of clear-skies pole ward of the convective cloudiness band and also by warm air advection and upward motion in the region of the enhanced convective band. Analysis of precipitation and outgoing long-wave radiation for several periods showed that there is generally an enhancement of continental convective activity when this type of interaction takes place.

ASSUNTO(S)

meteorologia goes-east tropical convection meteorology meteorologia sinotica sistemas frontais conveccao tropical amazonia (regiao) system

ACESSO AO ARTIGO

Documentos Relacionados