Sensitivity of Daily Doses of Biologically Active Radiation, To Ozone Changes In Southern French Alps
Abstract
Global UV irradiance spectra we re recorded each half an hour between sunrise and sunset, along the year 2000 in Briançon (1300m asl) at the CEMBREU (Centre Européen Médical Bioclimatique de Recherche et d'Enseignement Universitaire), a site of the French spectral UV network in Southern Alps. From these spectra are retrieved atmospheric transmissivities corresponding to daily doses of various biologically active radiation. A transmissivity is defined as the ratio of the ground level value of a daily dose to the extra -atmospheric value of this daily dose. The daily doses studied relate to UVB, erythema, DNA damage, and plant damage. Multiple linear correlations of the various transmissivities with the three predictors (daily sunshine fraction), µmin (cosine of the daily minimum SZA), and (daily total ozone column) assumed to be independent variables, are done for year 2000. These correlations permit to assess the mean sensitivities of the various transmissivities, to changes in for different cloud cover conditions in Briançon. The variations of each sensitivity is studied as a function of , µmin and . Comparing the results obtained with those given in the literature, we find for = 1 (that is for a strong probability of clear sky conditions) and SZA min = 45°, a radiation amplification factor (RAF) of the erythemal daily dose equal to 1.1 when = 285 DU, and to 1.4 when = 315 DU.
- Publication:
-
EGS General Assembly Conference Abstracts
- Pub Date:
- 2002
- Bibcode:
- 2002EGSGA..27.6334D