INVESTIGADORES
SILVESTRI Gabriel Emilio
artículos
Título:
El Niño signal variability in the precipitation over southeastern South America during austral summer
Autor/es:
G. SILVESTRI
Revista:
GEOPHYSICAL RESEARCH LETTERS
Editorial:
American Geophysical Union
Referencias:
Año: 2004 vol. 31 p. 1 - 5
ISSN:
0094-8276
Resumen:
Some aspects of El Nino (EN) events signal in the
precipitation over southeastern South America (SESA)
during austral summer are examined. In FebruaryMarch
this signal covers most of the southeast part of SESA and has
a wide range of variability in its intensity. The rainiest EN
events are characterized by an intensification of the moisture
flow from the amazonic forest to SESA jointly with an
enhancement of the subtropical jet over South America. The
dynamics in upper-levels is associated with a circulation
field in the Southern Hemisphere dominated by the presence
of the ENSO pattern described in previous studies. During
less rainy EN events the moisture flow towards SESA
diminishes; and, the structure of the ENSO pattern of
circulation over South America implicates a weakening of
the subtropical jet. Therefore, the characteristics of the low
and upper levels circulation modulate the intensity of the rain
over SESA during these events.