Extreme solar total and UV irradiances due to cloud effect measured near the summer solstice at the high-altitude desertic plateau Puna of Atacama (Argentina)

Details Extreme solar total and UV irradiances due to cloud effect measured near the summer solstice at the high-altitude desertic plateau Puna of Atacama (Argentina) Extreme solar total and UV irradiances due to cloud effect measured near the summer solstice at the high-altitude desertic plateau Puna of Atacama (Argentina)

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..727p&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 6, p. 727-731.

Physics

2

Scientific paper

Broadband data of solar total (300-3000nm) and ultraviolet (UV) (295-385nm) irradiances as far as spectrometric data measured near the Southern Hemisphere summer solstice at the high-altitude desertic plateau Puna of Atacama, Argentina, are presented. The simultaneous contributions of small solar zenith angle, high-altitude desertic intertropical region plus a cumulus cloud formation around the Sun's angular position in the sky produced extreme high intensities. In particular, several measured total irradiances in a time interval of about one-and-a half hours near noon were higher than the extraterrestrial solar constant corrected for the actual Earth-Sun distance on these days (1412W/m2), reaching a maximum value of 1528W/m2 at 12:09 (Argentina local time, i.e. UT-3h) corresponding to a solar zenith angle of /16°. The highest UV irradiance measured was 69.5W/m2 at 13:29 (θz=2.4°). Mean percentage increases due to cloud effect of 6% for UV and 12% for total solar irradiances were estimated with respect to the situation of no-clouds near Sun. The mean UV over total irradiances percentage ratio was also determined giving 4.7% at the moment of cloud enhancement and 5% outside it, which shows that the UV component was also increased, but to a lesser extent. So situations with cumulus cloud formation in this region in relation to its biological and material degradation impacts must be taken into consideration. Photographs showing the particular configuration of the Sun-cumulus cloud system obtained at moments of very high solar intensities are also presented.

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