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Satellite-derived UV climatology at Escudero Station, Antarctic Peninsula

Published online by Cambridge University Press:  28 March 2013

Raul R. Cordero*
Affiliation:
Universidad de Santiago de Chile, Ave Bernardo O'Higgins 3363, Santiago, Chile
Alessandro Damiani
Affiliation:
Universidad de Santiago de Chile, Ave Bernardo O'Higgins 3363, Santiago, Chile
Gunther Seckmeyer
Affiliation:
Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
Stefan Riechelmann
Affiliation:
Leibniz Universität Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
Fernando Labbe
Affiliation:
Universidad Técnica Federico Santa María, Ave España 1680, Valparaíso, Chile
David Laroze
Affiliation:
Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile Max Planck Institute, 55021 Mainz, Germany
Fernanda Garate
Affiliation:
Universidad de Santiago de Chile, Ave Bernardo O'Higgins 3363, Santiago, Chile

Abstract

We have used data from the Ozone Monitoring Instrument (OMI) aboard NASA's Earth Observing System (EOS) Aura satellite over the period 2004–11 to describe the characteristics of surface ultraviolet (UV) irradiance at Escudero Station (62°12′S, 58°57′W). The station is located on King George Island (northern Antarctic Peninsula). Temperatures in summer are frequently above 0°C, and the surrounding ocean is typically ice-free. We found that the UV irradiance at Escudero is driven by the Antarctic ozone hole (which annually in spring leads to significant variations in the ozone) and by clouds (which are more frequent and have a larger optical depth compared with other Antarctic sites). The combined effect of ozone and clouds led to significant variations in the surface UV. The variability (taken as the standard deviation of the UV estimates retrieved from OMI) is typically greater than 30% at Escudero, but may reach values greater than 50% in spring. The consistency of OMI-derived data was checked by using ground-based spectral measurements carried out under controlled conditions in January 2011.

Type
Physical Sciences
Copyright
Copyright © Antarctic Science Ltd 2013 

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