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

V E Fioletov; Michael G Kimlin; N Krotkov; L J B McArthur; J B Kerr; D I Wardle; J R Herman; R Meltzer; T W Mathews; J Kaurola

doi:10.1029/2004JD004820

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

Journal article

Peer reviewed

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

V E Fioletov, Michael G Kimlin, N Krotkov, L J B McArthur, J B Kerr, D I Wardle, J R Herman, R Meltzer, T W Mathews and J Kaurola

Journal of Geophysical Research: Atmospheres, Vol.109(22), pp.1-13

2004

DOI: https://doi.org/10.1029/2004JD004820

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Abstract

UV index

Brewer

TOMS

pyranometer

climatology

ozone

Long-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. Copyright 2004 by the American Geophysical Union.

Details

Title: UV index climatology over the United States and Canada from ground-based and satellite estimates
Authors: V E Fioletov (Author) - Meteorological Service of Canada, Canada
Michael G Kimlin (Author) - University of Georgia, United States
N Krotkov (Author) - University of Maryland, United States
L J B McArthur (Author) - Meteorological Service of Canada, Canada
J B Kerr (Author) - Meteorological Service of Canada, Canada
D I Wardle (Author) - Meteorological Service of Canada, Canada
J R Herman (Author) - NASA Goddard Space Flight Centre, United States
R Meltzer (Author) - University of Georgia, United States
T W Mathews (Author) - Meteorological Service of Canada, Canada
J Kaurola (Author) - Finnish Meteorological Institute, Finland
Publication details: Journal of Geophysical Research: Atmospheres, Vol.109(22), pp.1-13
Publisher: Wiley-Blackwell Publishing Inc.
Date published: 2004
DOI: 10.1029/2004JD004820
ISSN: 0148-0227
Organisation Unit: University of the Sunshine Coast, Queensland; School of Health and Sport Sciences - Legacy
Language: English
Record Identifier: 99449589202621
Output Type: Journal article

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