@Article{AndreoliOlKaViSoCa:2017:InDiEl,
author = "Andreoli, Rita Val{\'e}ria and Oliveira, Suzana Soares de and
Kayano, Mary Toshie and Viegas, Juarez and Souza, Rodrigo Augusto
Ferreira de and Candido, Luiz Antonio",
affiliation = "{Universidade do Estado do Amazonas (UEA)} and {Instituto Nacional
de Pesquisas da Amaz{\^o}nia (INPA)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
da Amaz{\^o}nia (INPA)} and {Universidade do Estado do Amazonas
(UEA)} and {Instituto Nacional de Pesquisas da Amaz{\^o}nia
(INPA)}",
title = "The influence of different El Niņo types on the South American
rainfall",
journal = "International Journal of Climatology",
year = "2017",
volume = "37",
number = "3",
pages = "1374--1390",
keywords = "El Nino-Southern Oscillation, precipitation, South America.",
abstract = "The impacts of El Nino (EN) on the rainfall over South America are
investigated considering three EN types differing in the locations
of the maximum sea surface temperature (SST) anomalies in the
equatorial Pacific: the Central-Pacific (CP), Eastern-Pacific (EP)
and the Mixed (MIX) types. The largest positive (SST) anomalies
for the EP and CP types occur, respectively, in the eastern and
central sectors of the tropical Pacific during all seasons. The
SST anomaly pattern for the MIX-EN resembles that of the EP-EN
during its onset stage, and of the CP-EN during its mature and
demise stages. The different SST anomaly patterns affect the
large-scale (Walker circulation and the tropospheric Rossby-wave
trains) and local (South American low-level jet-SALLJ) atmospheric
circulation patterns in different ways and lead to distinct
precipitation anomaly patterns over South America. Variations in
the position and longitudinal extension of the downward motions of
the EN-related eastward-displaced Walker circulation explain the
differences in the dryness over equatorial South America. For the
CP-EN, a double Walker cell defines a more zonal configuration of
the equatorial dryness over South America during the first three
analysed seasons. This feature is not noted for the other two EN
types. The Rossby-wave train pattern path depends on the EN types
and seasons. In consequence, the associated local atmospheric
circulation patterns depend also on the season and EN types. In
all seasons, an intense SALLJ for the EP EN contrasts with weak or
inexistence SALLJ for the other two EN types. Thus, a wetter
condition over southeastern South America, southern and eastern
Brazil occurs for the EP EN in relation to the other EN types. The
results shown here, in particular considering the MIX EN type,
have not been discussed before and might be useful mainly for
climate monitoring purposes.",
doi = "10.1002/joc.4783",
url = "http://dx.doi.org/10.1002/joc.4783",
issn = "0899-8418",
language = "en",
targetfile = "andreoli_influence.pdf",
urlaccessdate = "02 maio 2024"
}