Determining the desert dust aerosol presence in the Mantaro Valley, Peru

Determinación de la presencia de aerosoles de polvo desértico en el Valle del Mantaro, Perú

By: I. Y. Platero, R. Estevan, A. Moya, R. A. Yuli

Main Information

Volume:
Vol.51-N3 / 2018 - Ordinario
Section:
Atmospheric Optics
Pages:
50023:1-14
DOI:
http://doi.org/10.7149/OPA.51.3.50023
Type:
Research papers / Trabajos de investigación
Language:
Spanish
Attachments:
Keywords:
AOD, sunphotometer, AERONET, desert dust.

AOD, fotómetro solar, AERONET, polvo desértico.
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Abstract

Since March 19, 2015, a sunphotometer CIMEL CE-318T has been installed in the Huancayo Observatory, belonging to the Geophysical Institute of Peru. Aerosol Optical Depth at 440 nm (τ440) and the Ångström Exponent (α) derived from columnar aerosol sun-photometer measurement, based on Aerosol Robotic Network (AERONET) products, has been used for aerosols classification. The used AERONET dataset correspond to quality Level 2.0. A reliable identification of desert dust events has been possible based on above mentioned parameters. A total of 5 days and 10 hours have been identified as desert dust events based on AERONET dataset and the air mass backtrajectories employing the Hybrid Single Particle Lagrangian Integrated Trajectory Model (HYSPLIT). Simulations carried out with the Weather Research and Forecasting (WRF) Model has been used to corroborate the desert dust events. The most intense event was recorded in December 27, 2016, with a maximum AOD value of 0.32 at 12:03 GMT. It has been shown that the major contribution to AOD on days identified as desert dust events, corresponds to desert dust aerosols. This is the first report for Peru, of desert dust aerosols transport from the Peruvian coastal desert to the central Andes, specifically to the Mantaro Valley.


Desde el 19 de marzo de 2015, se ha instalado un fotómetro solar del tipo CIMEL CE-318T en el Observatorio de Huancayo, perteneciente al Instituto Geofísico del Perú. El Espesor Óptico por Aerosoles a 440 nm (τ440) y el Exponente de Ångström (α) derivados de las mediciones columnares del fotómetro solar, basados en los productos de la Red Robótica de Aerosoles (AERONET), se han utilizado para la clasificación de los aerosoles. El conjunto de datos de utilizados corresponde al nivel de calidad 2.0 de AERONET. La identificación confiable de los eventos de polvo desértico ha sido posible en base a los parámetros mencionados anteriormente. Se identificaron un total de 5 días y 10 horarios como eventos de polvo desértico, basados en los datos de AERONET y las retrotrayectorias de masas de aire empleando el Modelo de Trayectoria Integrada Lagrangiana de Partícula Híbrida (HYSPLIT). Las simulaciones llevadas a cabo con el modelo de investigación y pronóstico del tiempo (WRF) se ha utilizado para corroborar los eventos de polvo desértico. El evento más intenso se registró el 27 de diciembre de 2016, con un valor máximo de AOD de 0.32 a las 12:03 GMT. Se ha evidenciado que la principal contribución al EOA en los días identificados como eventos de polvo desértico corresponde a los aerosoles de polvo desérticos. Este es el primer reporte para Perú, sobre el transporte de aerosoles de polvo desértico desde el desierto costero peruano hasta los Andes centrales, específicamente al Valle del Mantaro.

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