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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 112,
D24S44,
15 PP., 2007
doi:10.1029/2007JD008830
Validation of daily erythemal doses from Ozone Monitoring Instrument with ground-based UV measurement data
Finnish Meteorological Institute, Helsinki, Finland
Finnish Meteorological Institute, Helsinki, Finland
Finnish Meteorological Institute, Helsinki, Finland
Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, Baltimore, Maryland, USA
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Finnish Meteorological Institute, Helsinki, Finland
Finnish Meteorological Institute, Helsinki, Finland
Arctic Research Centre, Finnish Meteorological Institute, Sodankylä, Finland
Meteorological Service of Canada/Environment Canada, Downsview, Ontario, Canada
Biospherical Instruments, San Diego, California, USA
National Institute of Water and Atmospheric Research, Lauder, Central Otago, New Zealand
Division of Global Atmospheric Environment, Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Laboratory for Radiation Research, National Institute for Public Health and the Environment (RIVM), Bilthoven, Netherlands
Laboratory for Radiation Research, National Institute for Public Health and the Environment (RIVM), Bilthoven, Netherlands
Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
Finnish Meteorological Institute, Helsinki, Finland
The Dutch-Finnish Ozone Monitoring Instrument (OMI) on board the NASA EOS Aura spacecraft is a nadir viewing spectrometer that measures solar reflected and backscattered light in a selected range of the ultraviolet and visible spectrum. The instrument has a 2600 km wide viewing swath and it is capable of daily, global contiguous mapping. The Finnish Meteorological Institute and NASA Goddard Space Flight Center have developed a surface ultraviolet irradiance algorithm for OMI that produces noontime surface spectral UV irradiance estimates at four wavelengths, noontime erythemal dose rate (UV index), and the erythemal daily dose. The overpass erythemal daily doses derived from OMI data were compared with the daily doses calculated from the ground-based spectral UV measurements from 18 reference instruments. Two alternative methods for the OMI UV algorithm cloud correction were compared: the plane-parallel cloud model method and the method based on Lambertian equivalent reflectivity. The validation results for the two methods showed some differences, but the results do not imply that one method is categorically superior to the other. For flat, snow-free regions with modest loadings of absorbing aerosols or trace gases, the OMI-derived daily erythemal doses have a median overestimation of 0–10%, and some 60 to 80% of the doses are within ±20% from the ground reference. For sites significantly affected by absorbing aerosols or trace gases one expects, and observes, bigger positive bias up to 50%. For high-latitude sites the satellite-derived doses are occasionally up to 50% too small because of unrealistically small climatological surface albedo.
Received 16 April 2007; accepted 14 August 2007; published 21 December 2007.
Citation: (2007), Validation of daily erythemal doses from Ozone Monitoring Instrument with ground-based UV measurement data, J. Geophys. Res., 112, D24S44, doi:10.1029/2007JD008830.
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