@Article{PezziCava:2001:NuSt,
author = "Pezzi, Luciano Ponzi and Cavalcanti, Iracema Fonseca de
Albuquerque",
affiliation = "Instituto Nacional de Pesquisas Espaciais,(INPE/CPTEC) and
{Instituto Nacional de Pesquisas Espaciais (INPE/CPTEC)}",
title = "The relative importance of ENSO and tropical Atlantic sea surface
temperature anomalies for seasonal precipitation over South
America: a numerical study",
journal = "Climate Dynamics",
year = "2001",
volume = "17",
number = "2-3",
pages = "205--212",
month = "jan",
keywords = "Northeast Brazil, oscillation, circulation, ocean, dynamics,
rainfall, climate.",
abstract = "The role of tropical Atlantic sea surface temperature (SST)
anomalies during ENSO episodes over northeast Brazil (Nordeste) is
investigated using the CPTEC/COLA Atmospheric General Circulation
Model (AGCM). Four sets of integrations are performed using SST in
Fl Nino and La Nina (ENSO) episodes, changing the SST of the
Atlantic Ocean. A positive dipole (SST higher than normal in the
tropical North Atlantic and below normal in the tropical South
Atlantic) and a negative dipole (opposite conditions), are set as
the boundary conditions of SST in the Atlantic Ocean. The four
experiments are performed using El Nino or La Nina SST in all
oceans, except in the tropical Atlantic where the two phases of
the SST dipole are applied. Five initial conditions were
integrated in each case in order to obtain four ensemble results.
The positive SST dipole over the tropical Atlantic Ocean and Fl
Nino conditions over the Pacific Ocean resulted in dry conditions
over the Nordeste. When the negative dipole and Fl Nino conditions
over the Pacific Ocean were applied, the results showed
precipitation above normal over the north of Nordeste. When La
Nina conditions over Pacific Ocean were tested together with a
negative dipole, positive precipitation anomalies occurred over
the whole Nordeste. Using the positive dipole over the tropical
Atlantic, the precipitation over Nordeste was below average.
During La Nina episodes, the Atlantic Ocean conditions have a
larger effect on the precipitation of Nordeste than the Pacific
Ocean. In Fl Nino conditions, only the north region of Nordeste is
affected by the Atlantic SST. Other tropical areas of South
America show a change only in the intensity of anomalies. Central
and southeast regions of South America are affected by the
Atlantic conditions only during La Nina conditions, whereas during
El Nino these regions are influenced only by conditions in the
Pacific Ocean.",
copyholder = "SID/SCD",
issn = "0930-7575",
language = "en",
targetfile = "Pezzi_The relative importance.pdf",
urlaccessdate = "15 jun. 2024"
}