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Variations of UV irradiance at Antarctic station Concordia during the springs of 2008 and 2009

Published online by Cambridge University Press:  16 March 2011

Vito Vitale
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy
Boyan Petkov
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy International Centre for Theoretical Physics (ICTP), TRIL Program, Strada Costiera 11, I-34014 Trieste, Italy
Florence Goutail
Affiliation:
Service d'Aeronomie - CNRS, Route Forestiere de Verrieres, 91370 Verrieres le Buisson, France
Christian Lanconelli
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy
Angelo Lupi
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy
Mauro Mazzola
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy
Maurizio Busetto
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy
Andrea Pazmino
Affiliation:
Service d'Aeronomie - CNRS, Route Forestiere de Verrieres, 91370 Verrieres le Buisson, France
Riccardo Schioppo
Affiliation:
Italian National Agency for New Technologies, Energy and Environment (ENEA), ENE FOTO, Experimental field Mt Aquilone, S.S. Garganica 89 Km 178+700, I-71043 Manfredonia, Italy
Laura Genoni
Affiliation:
Department of Geological, Environmental and Marine Sciences, University of Trieste, Via Weiss 2, I-34127 Trieste, Italy
Claudio Tomasi
Affiliation:
Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), via Gobetti, 101, I-40129 Bologna, Italy
Corresponding
E-mail address:

Abstract

The features of solar UV irradiance measured at the Italian-French Antarctic Plateau station, Concordia, during the springs of 2008 and 2009 are presented and discussed. In order to study the impact of the large springtime variations in total ozone column on the fraction of ultraviolet B (UV-B) irradiance (from c. 290–315 nm) reaching the Earth surface, irradiance datasets corresponding to fixed solar zenith angles (SZAs = 65°, 75° and 85°) are correlated to the daily ozone column provided by different instruments. For these SZAs the radiation amplification factor varied from 1.58–1.94 at 306 nm and from 0.68–0.88 at 314 nm. The ultraviolet index reached a maximum level of 8 in the summer, corresponding to the typical average summer value for mid latitude sites. The solar irradiance pertaining to the ultraviolet A (UV-A, 315–400 nm) spectral band was found to depend closely on variations of atmospheric transmittance characteristics as reported by previous studies. Model simulations of UV-B irradiance showed a good agreement with field measurements at 65° and 75° SZAs. For SZA = 85° the ozone vertical distribution significantly impacted model estimations. Sensitivity analysis performed by hypothetically varying the ozone distribution revealed some features of the ozone profiles that occurred in the period studied here.

Type
Physical Sciences
Copyright
Copyright © Antarctic Science Ltd 2011

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Variations of UV irradiance at Antarctic station Concordia during the springs of 2008 and 2009
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