Abstract

CORONEL, Alejandra S; BISCHOFF, Susana A  and  LARA, Miguel Ángel. Vertical, temporal and spatial structure of the extreme air masses in Argentine during winter. Meteorologica [online]. 2006, vol.31, n.1-2, pp.37-48. ISSN 1850-468X.

Using the potential equivalent adiabatic temperature in 850 hPa at Resistencia, Ezeiza y Comodoro Rivadavia the air mass is identified. Extreme cold and warm air masses were defined, both identified using quantiles classification of θae at 850 hPa. The relationship of the values of θae at 850 hPa of extreme cold and warm air masses with surface parameters as temperature, pressure and humidity at different hours of the day is statistically significant using a discriminant analysis. The temporal evolution of the variables at surface as well as in the troposphere during the days before and after the occurrence of the cold event helped to identify that: on the surface a pressure maximum, a temperature minimum that takes place on the day of the event and a greater precipitation probability before the event occurrence. A maximum cooling and air mass stabilisation is observed in the troposphere from the day of occurrence of the event. As to the warm event, it was possible to identify on the surface a pressure minimum and a temperature maximum and a greater precipitation probability subsequent to the event. A maximum warming was observed in the troposphere on the day of the event.

Keywords : Air masses; Potential adiabatic equivalent temperature; Anomalies; Argentina.

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