Next Article in Journal
Modulation of the Westerly and Easterly Quasi-Biennial Oscillation Phases on the Connection between the Madden–Julian Oscillation and the Arctic Oscillation
Previous Article in Journal
Neural Network Model Analysis for Investigation of NO Origin in a High Mountain Site
Previous Article in Special Issue
Observational Evidence of the Transition from Shallow to Deep Convection in the Western Caribbean Trade Winds
Open AccessArticle

The Influence of the Atlantic Multidecadal Oscillation on the Choco Low-Level Jet and Precipitation in Colombia

1
Department of Geography, Faculty of Humanities, Universidad del Valle. Calle 13 #100–00, Cali, PO Box:25360, Colombia
2
Postgraduation Program CLIAMB, Instituto Nacional de Pesquisas da Amazônia (INPA)-Universidade do Estado do Amazonas (UEA), Ave. André Araújo, 2936, Manaus CEP 69060–001, Brazil
3
Universidade do Estado do Amazonas, Escola Superior de Tecnologia, Av. Darcy Vargas, 1200, Parque 10 de Novembro, Manaus, AM, 69050–020, Brazil
4
Instituto Nacional de Pesquisas Espaciais, Centro de Previsão de Tempo e Estudos Climáticos, Divisão de Modelagem e Desenvolvimento. Av. dos Astronautas, 1758, São José dos Campos, SP, 12227–010, Brazil
5
Department of Geography, University of California, Santa Barbara, CA 94720, USA
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(2), 174; https://doi.org/10.3390/atmos11020174
Received: 23 December 2019 / Revised: 4 February 2020 / Accepted: 5 February 2020 / Published: 7 February 2020
(This article belongs to the Special Issue Central America and Caribbean Hydrometeorology and Hydroclimate)
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 Niña 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.
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 Choco Low-Level Jet; Caribbean Low-Level Jet; Atlantic Multidecadal Oscillation; Pacific Decadal Oscillation; low-frequency variability; Northwestern South America climate; moisture transport; precipitation
Show Figures

Graphical abstract

MDPI and ACS Style

Loaiza Cerón, W.; Andreoli, R.V.; Kayano, M.T.; Ferreira de Souza, R.A.; Jones, C.; Carvalho, L.M.V. The Influence of the Atlantic Multidecadal Oscillation on the Choco Low-Level Jet and Precipitation in Colombia. Atmosphere 2020, 11, 174.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop