© European Geosciences Union 2008 The role of the observed
tropical convection in the generation of frost events in the
southern cone of South America 1Centro de Investigación
Científica y de Transferencia Tecnológica a la Producción
(CICYTTP/CONICET), Diamante, Argentina 2Departamento de Ciências
Atmosféricas, Universidade de São Paulo, Brazil 3Departamento de
Física, Universidade Federal de Santa Maria/CRSPE-INPE, Brazil
Abstract. Based on previous results obtained from observations
and linear wave theory analysis, the hypothesis that large-scale
patterns can generate extreme cold events in southeast South
America through the propagation of remotely excited Rossby waves
was already suggested. This work will confirm these findings and
extend their analysis through a series of numerical experiments
using a primitive equation model where waves are excited by a
thermal forcing situated in positions chosen according to
observed convection anomalies over the equatorial region. The
basic state used for these exper