Cloud impact study in solar surface radiation using the R2-SOLAR network in Argentine territory

WOLFRAM E; SALVADOR J; ORTE F; VAZQUEZ P; AMANCHATOUX G; D'ELIA R; BULNES D; QUEL E

Workshop; VIII Workshop on Lidar Measurements in Latin America; 2015

In the framework of the international project named SAVER.Net (South American Environmental Risk Network), the CEILAP?s Lidar Division was established a new ground based radiation monitoring network in the Argentine territory. This project has the main goal to develop an atmospheric environmental risk-management system in South America that create a bridge between the primary data generators and the national authorities that disseminates public warming in case of atmospheric event likes volcanic ash eruption, Patagonian dust storms, high UV radiation sunbathing, between others. The increase in the instrument capabilities that come of the hand of this project offer the opportunity to make scientific studies of different atmospheric events in several spatial and time scales. The radiation monitoring network is constituted with moderated narrow band radiometers GUV 2511, broadband pyranometers in the visible (Kipp&Zonen CMP21) and UVA and UVB (YES) installed at the moment in 5 sites in the Argentine territory, four of them in Patagonia region. Synergies of radiometer measurements with model permit to determine UV Index, cloud optical deep, total ozone column, and to quantify the impact of different aerosols and cloud event over solar radiation at ground surface. In this work we will present preliminary results of cloud impact in the surface solar radiation at different time scale that is to short time rates (minutes) to seasonal variation. The results show that the clouds reduce the visible daily solar irradiance between 30-40% in average without a defined seasonal influence. Instead the partially cloud cover when solar disk is unblocked can produce solar UV enhancements up to 20% but in shorted time scales (5-10 minutes).