@Article{AraújoAndCanKaySou:2013:InEvEl,
author = "Ara{\'u}jo, Rosimeire Gonzalez and Andreoli, Rita Val{\'e}ria
and Candido, Luiz Antonio and Kayano, Mary Toshie and Souza,
Rodrigo Augusto Ferreira de",
affiliation = "Av. Andr{\'e} Ara{\'u}jo, 2936, Campus II, Aleixo, 69060-001,
Manaus, AM, Brazil and Universidade do Estado do Amazonas, Escola
Superior de Tecnologia, Coordena{\c{c}}{\~a}o de Meteorologia,
Av. Darcy Vargas, 1200, Parque 10 de Novembro, 69065-020, Manaus,
AM, Brazil and {Instituto Nacional de Pesquisas da Amaz{\^o}nia
(INPA)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
Universidade do Estado do Amazonas, Escola Superior de Tecnologia,
Coordena{\c{c}}{\~a}o de Meteorologia, Av. Darcy Vargas, 1200,
Parque 10 de Novembro, 69065-020, Manaus, AM, Brazil",
title = "A influ{\^e}ncia do evento El Niño – Oscila{\c{c}}{\~a}o Sul e
Atl{\^a}ntico Equatorial na precipita{\c{c}}{\~a}o sobre as
regi{\~o}es norte e nordeste da Am{\'e}rica do Sul / Influence
of EI Niño-Southern oscillation and equatorial Atlantic on
rainfall over northern and northeastern regions of South America",
journal = "Acta Amazonica",
year = "2013",
volume = "43",
number = "4",
pages = "469--480",
keywords = "EI Niño - Southern Oscillation, Atlantic Equatorial Mode (AEM),
Pacific Ocean.",
abstract = "Os impactos de eventos an{\^o}malos no oceano Pac{\'{\i}}fico
associados ao El Niño-Oscila{\c{c}}{\~a}o Sul (ENOS) na
precipita{\c{c}}{\~a}o da regi{\~a}o norte e nordeste da
Am{\'e}rica do Sul foram avaliados para o per{\'{\i}}odo de
1900 a 2007, fazendo-se uso de an{\'a}lise de
composi{\c{c}}{\~o}es. Os eventos El Niño (La Niña) no
Pac{\'{\i}}fico que juntamente com um Modo Equatorial no
Atl{\^a}ntico (MEA) frio (quente) formam um gradiente interbacias
entre o Pac{\'{\i}}fico e Atl{\^a}ntico foram analisados
considerando, separadamente, aqueles para os quais o gradiente se
forma na fase inicial do ENOS daqueles em que o gradiente se forma
na fase de decaimento do ENOS. Os resultados mostram que o
padr{\~a}o de precipita{\c{c}}{\~a}o na regi{\~a}o norte e
nordeste da Am{\'e}rica do Sul {\'e} refor{\c{c}}ado mediante a
configura{\c{c}}{\~a}o do gradiente interbacias durante a fase
inicial do ENOS. Nesse caso, uma poss{\'{\i}}vel
explica{\c{c}}{\~a}o {\'e} que o MEA de sinal contr{\'a}rio ao
ENOS durante sua fase inicial cria condi{\c{c}}{\~o}es
favor{\'a}veis para o desenvolvimento de um gradiente
inter-hemisf{\'e}rico no Atl{\^a}ntico Tropical atuando no mesmo
sentido do gradiente interbacias, e colaborando para fortalecer o
efeito do El Niño (La Niña) na precipita{\c{c}}{\~a}o. Por outro
lado, para os eventos ENOS em que o gradiente se forma em sua fase
de decaimento, o impacto na precipita{\c{c}}{\~a}o {\'e} mais
significativo na regi{\~a}o norte e centro-oeste da bacia. Uma
poss{\'{\i}}vel explica{\c{c}}{\~a}o para essas
diferen{\c{c}}as est{\'a} associada {\`a}s mudan{\c{c}}as que
ocorrem na circula{\c{c}}{\~a}o atmosf{\'e}rica leste-oeste
associada ao gradiente lesteoeste de anomalias da TSM. Os
resultados deste estudo podem ser {\'u}teis, principalmente, para
fins de monitoramento clim{\'a}tico. ABSTRACT: The impacts of
anomalous events in the Pacific Ocean associated with the El Niño
- Southern Oscillation (ENSO) on rainfall over northern and
northeastern regions of South America were evaluated for the
period from 1900 to 2007 using composite analyses. The El Niño (La
Niña) events in the Pacific, that together with a cold (warm)
Atlantic Equatorial Mode (AEM) form an interbasin gradient between
the Pacific and Atlantic were analyzed considering separately
those for which the gradient forms during the ENSO onset phase
from those for which the gradient forms during the ENSO demise
phase. The results show that the rainfall pattern over the
northern and northeastern region of South America is reinforced
under an interbasin gradient during the initial phase of the ENSO
event. In this case, a possible explanation is that the AEM with
opposite sign of the ENSO event in its onset stage creates
favorable conditions for the development of an interhemispheric
gradient in the Tropical Atlantic acting in the same direction of
the interbasin gradient, and collaborating to reinforce the El
Niño (La Niña) effect on the precipitation. On the other hand, for
ENSO events for which the interbasin gradient forms in the demise
stage, the impact on the precipitation is more significative in
the northern and central-western regions of the basin. A possible
explanation for these differences is linked to the alterations in
the east-west atmospheric circulation associated with the
east-west gradient of the SST anomalies. The result of this study
might be useful mainly for climate monitoring purposes.",
doi = "10.1590/S0044-59672013000400009",
url = "http://dx.doi.org/10.1590/S0044-59672013000400009",
issn = "0044-5967",
label = "scopus 2013-11",
language = "pt",
targetfile = "09.pdf",
urlaccessdate = "19 abr. 2024"
}