INVESTIGADORES
SILVESTRI Gabriel Emilio
artículos
Título:
Antarctic Oscillation signal on precipitation anomalies over southeastern South America
Autor/es:
G. SILVESTRI; C. VERA
Revista:
GEOPHYSICAL RESEARCH LETTERS
Editorial:
American Geophysical Union
Referencias:
Año: 2003 p. 1 - 4
ISSN:
0094-8276
Resumen:
The relation between the Antarctic Oscillation
(AAO) and the precipitation in southeastern South
America (SESA) is examined. The AAO influence is
particularly strong during winter and late spring although
of opposite sign. In particular during spring, AAO
positive (negative) phases are associated with the
intensification of an upper-level anticyclonic (cyclonic)
anomaly, weakened (enhanced) moisture convergence and
decreased (increased) precipitation over SESA. The
combined influence of both ENSO and AAO on SESA
precipitation was also explored and significant correlation
values between both oscillations are only observed during
spring. Results show that during that particular season,
AAO activity produces a strong modulation of the ENSO
signal on SESA precipitation.