UV ground based measurements in Río Gallegos, Argentina

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

AIP CONFERENCE PROCEEDINGS

AIP CONFERENCE PROCEEDINGS

Lugar: Nueva York; Año: 2009 vol. 1100 p. 351 - 354

0094-243X

The CEILAP Lidar Division has established an atmospheric remote sensing site in Río Gallegos (51º55`S, 69º14`W)in the southern part of Argentina. During years 2005-2006, SOLAR Campaign was held. The main objectives of thisexperiment were to measure stratospheric ozone profiles and surface UV radiation in a subpolar region, where theinfluence of polar vortex and the Antarctic ozone hole are remarkable. This remote sensing site has lidar instruments and passive sensor to measure solar UV irradiance. In this paper we focused on passive remote sensing sensors and the Río Gallegos erythemal irradiances are reported during 2005-2006. The time evolution of UV index was derived from these measurements and the influence of ozone depleted air masses overpass over Río Gallegos is highlighted. This Patagonian region is characterized by high cloud cover during day changing strongly the distribution of UV radiation that reaches the ground surface. For that reason some overpasses of ozone hole are masked by cloud cover avoiding the increase in UVB radiation. Reversely in same opportunities, cloud border increases the surface UV radiation. Both effects are analyzed in this work and the reduction or increases of ultraviolet radiation are quantified by comparison between measurement and modeled UV radiation. Complementary the time evolution of daily UV exposures are presented.