Retrieval of ozone column from global irradiance measurements and comparison with TOMS data. A year of data in the Alps

Details Retrieval of ozone column from global irradiance measurements and comparison with TOMS data. A year of data in the Alps Retrieval of ozone column from global irradiance measurements and comparison with TOMS data. A year of data in the Alps

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29i..23m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 9, pp. 23-1, CiteID 1309, DOI 10.1029/2002GL014823

Physics

7

Meteorology And Atmospheric Dynamics: Radiative Processes, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Spectral UV global irradiance has been measured regularly during the year 2000, in the French Alps, using two UV spectroradiometers. The total ozone column amount is retrieved from the ratio of irradiances around 305 and 340 nm, using look up tables based on modeling data. During cloudless days, ozone values from direct sun observations agree to within 5 DU. These ground based values compare reasonably well (to within about 4%, or 12 DU) with TOMS ozone data; this is consistent with the uncertainty of both methods which is estimated to 5 DU for TOMS, and 5-7 DU for clear sky ground based measurements. Generally the ground based ozone values seem to be slightly higher than the TOMS ozone values. For a few cases, the difference between TOMS and ground based values, can reach 10 to 15%. Different possible explanations of the discrepancies are considered.

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