MONITORING UV RADIATION USING GROUND BASED AND SATELLITE MEASUREMENTS AT SUBANTARTIC

SALVADOR J.; WOLFRAM E.; D'ELIA, R.; BONFILI, O; QUEL E.

Lago Magiore

Simposio; 33 International Symposium of Remote Sensing Environment; 2009

Environmental studies in the southern hemisphere are carried on by Lidar Division from CEILAP, with the  financial support of JICA (Japan International Cooperation Agency) and the collaboration of IPSL, France. Lidar Division set up a ground based remote sensing site at Río Gallegos city (51º 36’S, 69º 19’W), at southern part of South America for measuring of stratospheric ozone, with lidar remote sensing techniques and passive sensor to measure solar UV irradiance. The Patagonian region is characterized by high cloud cover during day strongly changing the distribution of UV radiation that reaches the ground surface. For that reason someoverpasses of ozone hole are masked by cloud cover avoiding the increase in UVB radiation. Solar UV radiation measured with UV-541 and YES radiometers are presented in this paper, focusing on the impact that cloud cover has on the temporal evolution of the UV solar radiation. The Cloud Fraction from satellite platform OMI/NASA is compared with the cloud optical depth obtained from the synergy of radiative transfer model with GUV irradiance measurements taken over 2005-2007 periods.