Objetivos: Estimar y analizar los flujos de calor latente y calor sensible dentro de la capa límite superficial durante los eventos más intensos de heladas ocurridos en la temporada otoño–invierno del 2018 en el Observatorio de Huancayo (12,05° S, 75,32° O, 3313 m.s.n.m.) dentro del valle del Mantaro. Metodología: Se utilizó una torre de gradiente meteorológica, una placa sensor de flujo de calor transferido en la superficie, tensiómetros y una estación completa de radiación miembro de la red BSRN para medir todos los componentes de irradiancia (onda corta y onda larga), también se utilizaron los productos de fracción de nubes de los satélites Terra (MOD06_L2) y Aqua (MYD06_L2) de la NASA. Los métodos utilizados para estimar los flujos de energía superficial fueron el de gradiente de flujo de perfil aerodinámico modificado y el de la relación de balance de energía de...

The present study presents a detailed analysis of the diurnal and monthly cycles the surface boundary layer and of surface energy balance in a sparse natural vegetation canopy on Huancayo observatory (12.04◦ S, 75.32◦ W, 3313 m ASL), which is located in the central Andes of Perú (Mantaro Valley) during an entire year (May 2018–April 2019). We used a set of meteorological sensors (temperature, relative humidity, wind) installed in a gradient tower 30 m high, a set of radiative sensors to measure all irradiance components, and a set of tensiometers and heat flux plate to measure soil moisture, soil temperatures and soil heat flux. To estimate turbulent energy fluxes (sensible and latent), two flux–gradient methods: the aerodynamic method and the Bowen-ratio energy-balance method were used. The ground heat flux at surface was estimated using a molecular heat transfer equation. The ...

Present study comes under the project MAGNET-IGP: Strengthening the research line in physics and microphysics of the atmosphere (Agreement No 010-2017-FONDECYT) This work was done using instruments of the Laboratory of Physics, Microphysics and Radiation (LAMAR) and computational resources, HPC-Linux -Cluster, from Laboratorio de Dinamica de Fluidos Geofisicos Computacionales at Instituto Geofisico del Peru (grants 101-2014-FONDECYT, SPIRALES2012 IRD-IGP, Manglares IGP-IDRC, PP068 program).We also thank Mr. Luis Suarez Salas for the support of LAMAR instruments.

A set of instruments to measure several physical, microphysical, and radiative properties of the atmosphere and clouds are essential to identify, understand and, subsequently, forecast and prevent the effects of extreme meteorological events, such as severe rainfall, hailstorms, frost events and high pollution events, that can occur with some regularity in the central Andes of Peru. However, like many other Latin American countries, Peru lacks an adequate network of meteorological stations to identify and analyze extreme meteorological events. To partially remedy this deficiency, the Geophysical Institute of Peru has installed a set of specialized sensors (LAMAR) on the Huancayo observatory (12.04º S, 75.32º W, 3350 m ASL), located in the Mantaro river basin, which is a part of the central Andes of Peru, especially in agricultural areas. LAMAR consists of a set of sensors that are used...