Abstract

CASTILLO, Rodrigo; NIETO, Raquel; GIMENO, Luis  and  DRUMOND, Anita. Influence of the main Annular Hemispheric Modes and ENSO on Mesoamerica's global moisture sources. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2019, vol.43, n.169, pp.746-763. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.859.

The influence of the interannual large-scale atmospheric oscillations in the uptake and moisture transport from the major oceanic moisture sources with impact over Mesoamerica is investigated herein using a sophisticated Lagrangian approach informed by ERA-Interim reanalysis data (1979-2012), which showed how the moisture sinks changes associated with the evaporation sources reproduce the well-known atmospheric systems variation patterns and the regional precipitation linked to El Niño-Southern Oscillation and the Arctic Oscillation. However, the most important result, not revealed before for the Mesoamerican region, is the Antarctic Oscillation teleconnection, which highlights a stronger statistical correlation with the Pacific moisture transport during the dry season and a little weaker correlation during the rainy season. These results may be used as predictors for the precipitation distribution behavior, mainly during its onset period and for its first maximum.

Keywords : Antarctic Oscillation (AAO); Artic Oscillation (AO); ENSO; Mesoamerica; moisture transport; FLEXPART.

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