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Optical Engineering

Comparison of Brewer ultraviolet irradiance measurements with total ozone mapping spectrometer satellite retrievals
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Paper Abstract

Comparison of measured UV irradiance with estimates from satellite observation is potentially effective for the validation of data from the two sources. Summer data from ten Canadian Brewer sites were compared in this study with noon UV irradiance estimated from total ozone mapping spectrometer (TOMS) measurements. In general, TOMS estimates can successfully reproduce long-term and major short-term UV variations. However, there are some systematic differences between the measurements at the ground and satellite-retrieved UV irradiance. From 3 to 11% of the Brewer-TOMS difference can be attributed to the Brewer angular response error. This error depends on the solar zenith angle and cloud conditions, and is different from instrument to instrument. When the angular response of the Brewer instrument is considered and applied, the Brewer data are still lower than TOMS-estimated UV irradiance by 9 to 10% on average at all sites except one. The difference is close to zero at one station (Saturna Island), possibly due to its much cleaner air. The bias can be seen in clear sky conditions and at the 324-nm wavelength, i.e., it is not related to local cloud conditions or absorption by ozone or SO2.

Paper Details

Date Published: 1 December 2002
PDF: 11 pages
Opt. Eng. 41(12) doi: 10.1117/1.1516818
Published in: Optical Engineering Volume 41, Issue 12
Show Author Affiliations
Vitali E. Fioletov, Meteorological Service of Canada (Canada)
James B. Kerr, Meteorological Service of Canada (Canada)
David I. Wardle, Meteorological Service of Canada (Canada)
Nickolay A. Krotkov, Univ. of Maryland/Baltimore County and Goddard Earth Sciences and Technology Ctr. (United States)
Jay R. Herman, NASA Goddard Space Flight Ctr. (United States)


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