Direct sun measurements with a CIMEL sunphotometer belonging to the AERONET network have been performed in the Huancayo Observatory, Peru, from March 2015 to August 2017, two and a half years, providing for the first time information about aerosols in the specific area. The prevalence of background conditions in the measurement site has been determined for the period of study. These conditions, which constitute more than 80% of cases, are occasionally altered, mainly by high aerosols loading, as a consequence of biomass-burning events. Biomass-burning periods cover every year from mid-July to mid-October. The identification of these periods has been possible through the classification of aerosols in 6 subtypes. The month with the maximum AOD monthly average is September, and in 2016, the absolute maximum value of 0.91 was registered. The mean AOD value for the study period is 0.10 ±0.07...

Se determinaron las características del aerosol recuperado en la estación AERONET de Huancayo. El estudio se realizó durante los eventos de quema de biomasa del año 2019. Se procesaron los datos del sensor MODIS de los satélites Aqua y Terra, y del fotómetro CIMEL. Se han calculado los valores medios, mínimos y máximos del espesor óptico del aerosol (AOD) y el exponente de Angstrom (EA), asimismo se determinaron los tipos de aerosoles presentes en el Observatorio de Huancayo. Para la intercomparación de los resultados se utilizaron los datos del Fotómetro de la red internacional AERO- NET localizado en Huancayo. La media del AOD y el EA medido con AERONET respectivamente es 0.159±0.073 (adimensional) y 1.624±0.198 (adimensional). Los valores medios del AOD Aqua y Terra son respectivamente 0.088 ± 0.056 y 0.098 ± 0.087. El análisis de retrotrayecoria realizado mediante HYS...

The main objective of the research is to evaluate the response of the WRF model to the domains and resolutions that are used in complex orographic conditions like the central Andes of Peru for the forecast of short- and medium-term rainfall. To do this, the model was configured with four domains and the verifications were made using data from meteorological stations located within the study area and TRMM data. Experiments were conducted for nine 10-day periods of rainy days, five cases of extreme rainfall, and one event with hail fall on the region. In general, the model overestimates precipitation, but, in the five cases of extreme rainfall, and in the case of the hailstorm, underestimation was observed, so it is not accurate to assert in an absolute way that WRF overestimates precipitation in the study region. It was observed that the 3-km domain simulate effectively the accumulated ra...

The study evaluated the sensitivity of the precipitation forecast in the central Andes of Peru of Weather Research and Forecasting (WRF) model to change the planetary boundary layer (PBL) schemes. In that region is located the Mantaro basin, which is one of the most important in the region. Here, the rainfall is very important to the agriculture and to the reserves of drinking water. The simulations were carried out with ten PBL schemes for 19 days in January, February, and March, between 2009 and 2012. Based on the statistical analysis (model vs. observation), the more efficient schemes were determined and analyses of the vertical profiles of some variables are shown. As a result, the schemes that most helped the model in rainfall forecasting were MYNN3 (general and north sector of the basin), Bou-Lac (central sector) and Bretherton-Park (southern sector). The model generally overestima...