@Article{LoaizaCerónAnKaSoJoCa:2020:InAtMu,
author = "Loaiza Cer{\'o}n, Wilmar and Andreoli, Rita Val{\'e}ria and
Kayano, Mary Toshie and Souza, Rodrigo Augusto Ferreira de and
Jones, Charles and Carvalho, Leila M. V.",
affiliation = "{Universidad del Valle} and {Universidade do Estado do Amazonas
(UEA)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade do Estado do Amazonas (UEA)} and {University of
California} and {University of California}",
title = "The influence of the Atlantic multidecadal oscillation on the
choco low-level jet and precipitation in Colombia",
journal = "Atmosphere",
year = "2020",
volume = "11",
number = "2",
pages = "e174",
month = "feb.",
keywords = "Choco Low-Level Jet, Caribbean Low-Level Jet, Atlantic
Multidecadal Oscillation, Pacific Decadal Oscillation,
low-frequency variability, Northwestern South America climate,
moisture transport, precipitation.",
abstract = "This study examines the influence of the Atlantic Multidecadal
Oscillation (AMO) on the Choco Low-level Jet (CJ) variations
during the 1983-2016 period. Considering the September-November
(SON) 925 hPa zonal wind index in the CJ core, a significant
breakpoint occurs in 1997 with larger values after 1997. The
changes in the CJ and Caribbean Low-Level Jet (CLLJ), and their
related ocean-atmospheric patterns and impacts on precipitation
over Colombia were analyzed considering separately the 1983-1996
and 1998-2016 periods, which overlap the cold and warm AMO phases,
respectively. During the 1998-2016 period, the negative sea
surface temperature (SST) anomalies in the tropical Pacific Ocean
and the positive ones in the Caribbean Sea and Tropical North
Atlantic (TNA) strengthen the CJ and weaken the CLLJ, and moisture
is transported into Central and Western Colombia increasing the
rainfall there. Our results indicate that part of the CJ
strengthening after 1997 was due to a higher percentage of intense
CJ events coinciding with La Nina events during the warm AMO and
cold Pacific Decadal Oscillation (PDO) background. However, the
AMO-related SST and sea level pressure (SLP) variations in the TNA
seem to be more crucial in modulating the CJ and CLLJ intensities,
such that CJ is weakened (intensified) and CLLJ is intensified
(weakened) before (after) 1997. As far as we know, the relations
of the CJ and CLLJ intensities to the AMO phases were not examined
before and might be useful for modeling studies.",
doi = "10.3390/atmos11020174",
url = "http://dx.doi.org/10.3390/atmos11020174",
issn = "2073-4433",
language = "en",
targetfile = "ceron_influence.pdf",
urlaccessdate = "02 maio 2024"
}