UV index climatology over the United States and Canada from ground-based and satellite estimates

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dc.contributor.authorFioletov, V. E.
dc.contributor.authorKimlin, M. G.
dc.contributor.authorKrotkov, Nickolay
dc.contributor.authorMcArthur, L. J. B.
dc.contributor.authorKerr, J. B.
dc.contributor.authorWardle, D. I.
dc.contributor.authorHerman, Jay
dc.contributor.authorMeltzer, R.
dc.contributor.authorMathews, T. W.
dc.contributor.authorKaurola, J.
dc.date.accessioned2023-07-11T21:31:31Z
dc.date.available2023-07-11T21:31:31Z
dc.date.issued2004-11-25
dc.description.abstractLong-term monthly mean UV index values for Canada and the United States were calculated using information from two sources: from noon erythemal UV estimated from Total Ozone Mapping Spectrometer (TOMS) total ozone and reflectivity data and from UV index values derived from observations of global solar radiation, total ozone, dew point, and snow cover. The results are presented as monthly maps of mean noon UV index values. Mean UV index values in summer range from 1.5 in the Arctic to 11.5 over southern Texas. Both climatologies were validated against spectral UV irradiance measurements made by Brewer spectrophotometers. With snow on the ground the TOMS-based data underestimate UV by up to 60% with respect to Brewer measurements and UV derived from global solar radiation and other parameters. In summer, TOMS UV index climatology values are from 10 to 30% higher than those derived from global solar radiation and other parameters. The difference is probably related to aerosol absorption and pollution effects in the lower troposphere that are not currently detected from space. For 21 of 28 midlatitude Brewer sites, long-term mean summer UV measured values and UV derived from global solar radiation and other parameters agree to within +5 to −7%. The remaining seven sites are located in “clean” environments where TOMS estimates agree with Brewer measurements while UV derived from global solar radiation and other parameters is 10–13% lower. Brewer data also demonstrate that clean and “typical” sites can be as little as 70–120 km apart.en_US
dc.description.sponsorshipThe NUVMC is funded through a contract from the U.S. EPA under EPA contracts 68-D-99-179 and 68-D-04-001.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004JD004820en_US
dc.format.extent13 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2cbz8-mtkt
dc.identifier.citationFioletov, V. E., Kimlin, M. G., Krotkov, N., McArthur, L. J. B., Kerr, J. B., Wardle, D. I., Herman, J. R., Meltzer, R., Mathews, T. W., and Kaurola, J. (2004), UV index climatology over the United States and Canada from ground-based and satellite estimates, J. Geophys. Res., 109, D22308, doi:10.1029/2004JD004820.en_US
dc.identifier.urihttps://doi.org/10.1029/2004JD004820
dc.identifier.urihttp://hdl.handle.net/11603/28603
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleUV index climatology over the United States and Canada from ground-based and satellite estimatesen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-6170-6750en_US
dcterms.creatorhttps://orcid.org/0000-0002-9146-1632en_US

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