@Article{KayanoAndrSouz:2019:ElNiOs,
author = "Kayano, Mary Toshie and Andreoli, Rita Val{\'e}ria and Souza,
Rodrigo Augusto Ferreira de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade do Estado do Amazonas (UEAM)} and {Universidade do
Estado do Amazonas (UEAM)}",
title = "El Nino-Southern oscillation related teleconnections over South
America under distinct Atlantic multidecadal oscillation and
Pacific interdecadal oscillation backgrounds: La Nina",
journal = "International Journal of Climatology",
year = "2019",
volume = "39",
number = "3",
pages = "1359--1372",
month = "mar.",
keywords = "Atlantic Multidecadal Oscillation, climate variability,
climatology, La Nina, Pacific Interdecadal Oscillation.",
abstract = "The Pacific Interdecadal Oscillation (PDO) and the Atlantic
Multidecadal Oscillation (AMO) influence in different ways the La
Nina (LN) related teleconnections in South America. The
low-frequency backgrounds in the Atlantic and Pacific Oceans play
an important role in modulating the LN-related Walker and Hadley
cells and the Rossby wavetrain pattern in the Southern Hemisphere.
The illustration shows the LN-related SST anomaly pattern during
the austral summer for distinct low-frequency backgrounds. This
analysis investigates the concomitant influence of two dominant
low-frequency modes, the Pacific Interdecadal Oscillation (PDO)
and the Atlantic Multidecadal Oscillation (AMO), on the La Nina
(LN) related climate teleconnections over South America (SA). Four
possible low-frequency backgrounds are analysed: WAMO/WPDO,
WAMO/CPDO, CAMO/WPDO and CAMO/CPDO, with the letters W and C
referring, respectively, to the warm and cold phases of the AMO
and PDO. The low-frequency anomalous sea surface cooling (warming)
in the tropical Pacific during the CPDO (WPDO) favours (impedes)
the settling of the LN-related negative SST anomalies in this
oceanic sector. Thus, the LN-related SST anomaly patterns in the
tropical Pacific in the CPDO backgrounds are meridionally more
extensive and stronger than those in the WPDO backgrounds. The
highest and lowest percentages of the years that experienced LN
events occurred during the WAMO/CPDO and CAMO/WPDO backgrounds,
respectively. The northern node of the LN-related wet-dry dipole
between northern SA and southeastern SA (SESA) occurs in most
seasons for all backgrounds. However, the southern node occurs in
specific seasons: spring and summer for the WAMO/WPDO, winter and
spring for the WAMO/CPDO, winter and summer for the CAMO/WPDO and
spring for the CAMO/CPDO. Also, the LN effect on the South
American monsoon with a wet-dry dipole between northern SA and
eastern Brazil during summer is noted in most backgrounds, but
with differences among them. We discuss here the differences in
the precipitation anomaly patterns, Walker and Hadley cells and
Rossby wavetrain patterns among the backgrounds. The low-frequency
Atlantic and Pacific backgrounds play an important role in
defining the rainfall anomaly pattern associated with the LN. The
results shown here have not been discussed before and might be
useful mainly for climate monitoring purposes.",
doi = "10.1002/joc.5886",
url = "http://dx.doi.org/10.1002/joc.5886",
issn = "0899-8418",
language = "en",
targetfile = "Kayano_et_al-2019-International_Journal_of_Climatology.pdf",
urlaccessdate = "29 mar. 2024"
}