@Article{AndreoliKVOSGRO:2019:EfTwDi,
author = "Andreoli, Rita Val{\'e}ria and Kayano, Mary Toshie and Viegas,
Juarez and Oliveira, Suzana Soares de and Souza, Rodrigo Augusto
Ferreira de and Garcia, S{\^a}mia Regina and Reto, Willy Hagi
Teles and Oliveira, Maria Bet{\^a}nia Leal de",
affiliation = "{Universidade do Estado do Amazonas (UEAM)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas da Amaz{\^o}ni (INPA)} and {Instituto Nacional de
Pesquisas da Amaz{\^o}ni (INPA)} and {Universidade do Estado do
Amazonas (UEAM)} and {Universidade Federal de Itajub{\'a}
(UNIFEI)} and {Universidade do Estado do Amazonas (UEAM)} and
{Universidade do Estado do Amazonas (UEAM)}",
title = "Effects of two different La Nina types on the South American
rainfall",
journal = "International Journal of Climatology",
year = "2019",
volume = "39",
number = "3",
pages = "1415--1428",
month = "mar.",
keywords = "La Nina, precipitation, South America.",
abstract = "The paper tests if the two La Nina (LN) types can be distinguished
from each other using their climate impacts on northeastern Brazil
(NEB). To this end, all LN events during the 1901-2010 period
followed by a wet or dry rainy season (from February to April) in
NEB are classified into two categories: WET-LN and DRY-LN. The
global and regional anomalous atmospheric circulation patterns and
the rainfall anomaly patterns in South America associated with the
two cases are analysed. The WET-LN and DRY-LN events present,
respectively, the eastern Pacific LN and central Pacific LN sea
surface temperature (SST) anomaly features in the tropical
Pacific. On the other hand, the WET-LN features an
interhemispheric SST dipole pattern in the tropical Atlantic, and
the DRY-LN, colder-than-normal surface waters in the tropical
South Atlantic (TSA) and equatorial Atlantic during MAM(+1). The
two analysed cases show regional differential circulation patterns
in all seasons. The anomalous wetness over northern and
northwestern South America occurs for the WET-LN type during
JJA(0)-DJF(+1) and for the DRY-LN type, during DJF(+1)-MAM(+1).
The anomalous dryness over SESA is more evident for the WET-LN
during JJA(0) and MAM(+1), and for the DRY-LN, during SON(0).
Anomalous dryness occurs in central and eastern South America
noted during JJA(0) and DJF(+1) for both cases analysed. The
precipitation anomalies in northern South America during DJF(+1)
are stronger and more extensive for the DRY-LN than for the WET-LN
events due to the action of both the anomalous (double) Walker and
Hadley cells for the DRY-LN, in contrast with the exclusive action
of an anomalous Walker cell for the WET-LN case. Also, a double
Walker cell drives the dry-wet dipole between northern South
America and NEB during MAM(+1) for the DRY-LN. Our results might
be useful mainly for climate monitoring purposes.
Palavras-chave.",
doi = "10.1002/joc.5891",
url = "http://dx.doi.org/10.1002/joc.5891",
issn = "0899-8418",
language = "en",
targetfile = "Andreoli_et_al-2019-International_Journal_of_Climatology.pdf",
urlaccessdate = "21 set. 2024"
}