Journal
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume 13, Issue 1, Pages 70-81Publisher
SPRINGERNATURE
DOI: 10.1039/c3pp50221j
Keywords
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Funding
- European Southern Observatory (ESO)
- Atacama Pathfinder Experiment (APEX)
- CONICYT-DAAD [Preis 257-2010]
- CONICYT-BMBF [Preis 236-2010]
- CONICY-T-ANILLOS [Preis ACT98]
- FONDECYT [Preis 1120639, Preis 3110159, Preis 1120764]
- Millennium Scientific Initiative [P10-061-F]
- CEDENNA, UTA-Project [8750-12]
- USACHDICYT
- UTFSM-DGIP
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Chile's northern Atacama Desert has been pointed out as one of the places on earth where the world's highest surface ultraviolet (UV) may occur. This area is characterized by its high altitude, prevalent cloudless conditions and relatively low total ozone column. Aimed at detecting those peak UV levels, we carried out in January 2013 ground-based spectral measurements on the Chajnantor Plateau (5100 m altitude, 23 degrees 00'S, 67 degrees 45'W) and at the Paranal Observatory (2635 m altitude, 24 degrees 37'S, 70 degrees 24'W). The UV index computed from our spectral measurements peaked at 20 on the Chajnantor Plateau (under broken cloud conditions) and at 16 at the Paranal Observatory (under cloudless conditions). Spectral measurements carried out in June 2005 at the Izana Observatory (2367 m altitude, 28 degrees 18'N, 16 degrees 30'W) were used for further comparisons. Due to the differences in sun-earth separation, total ozone column, altitude, albedo, aerosols and clouds, peak UV levels are expected to be significantly higher at southern hemisphere sites than at their northern hemisphere counterparts.
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