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Universidad Nacional Agraria La Molina (2018)

Eventos lluviosos y secos en la Costa Norte de Perú durante el Niño 2016

Alva Suárez, Paul Roberto

Titre : Eventos lluviosos y secos en la Costa Norte de Perú durante el Niño 2016

Auteur : Alva Suárez, Paul Roberto

Université de soutenance : Universidad Nacional Agraria La Molina

Grade : INGENIERO METEORÓLOGO 2018

Résumé
Since tropical precipitation can be highly variable in space, the methodology described by Douglas et al. (2009) is used, in order to discern synoptic and thermodynamic conditions associated with wet and dry days in the north coast of Peru during El Niño 2016, for which ERA-Interim reanalysis composites were used. The synoptic analysis at low levels shows the migration of the Intertropical Convergence Zone (ITCZ) towards the south of the Ecuador during the wet days as well as the intensification of the northern flow of moisture from the Caribbean. Both patterns favor the development of convection. At medium levels, between 500 and 700 hPa, specific humidity values were observed above 7.5 g/Kg on wet days with maximums of up to 8.5 g/Kg, whilst dry days show values between 6 and 6.5 g/Kg. Likewise, the incursion of inverted troughs of the east, act as a convective trigger during wet days. On the other hand, at the 200 hPa level, the position of the col exerts an inhibitory role on deep convection due to the convergence of the westerlies. The thermodynamic analysis shows values of precipitable water between 60 and 65 mm during the wet days, on average, a difference of 5 mm with maximums of up to 10 mm of precipitable water with dry days. Furthermore, an inverse relationship between CAPE and precipitation was observed, either by the effect of radiative cooling at the cloud top or by evaporative cooling from precipitation

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