Comparison of daily UV doses estimated from Nimbus 7/TOMS measurements and ground-based spectroradiometric data

Simple item page
dc.contributor.authorKalliskota, Sari
dc.contributor.authorKaurola, Jussi
dc.contributor.authorTaalas, Petteri
dc.contributor.authorHerman, Jay
dc.contributor.authorCelarier, Edward A.
dc.contributor.authorKrotkov, Nikolay A.
dc.date.accessioned2023-07-06T21:34:19Z
dc.date.available2023-07-06T21:34:19Z
dc.date.issued2000-02-01
dc.description.abstractDuring recent years, methods have been developed for estimating UV irradiance reaching the Earth's surface using satellite-measured backscattered UV radiances. The NASA-developed method is based on radiative transfer calculations and satellite measurements of parameters affecting UV radiation: extraterrestrial solar irradiance, atmospheric ozone, cloud reflectivity, aerosol amounts, and ground albedo. In this work a comparison is made between daily UV erythemal doses estimated from Nimbus-7/TOMS measurements (from 1991 to May 1993) and those calculated from ground-based spectroradiometer data. Three stations operated by the National Science Foundation were chosen for this comparison: Ushuaia, Argentina (for 573 days), Palmer, Antarctica (for 450 days), and San Diego, California, (for 149 days). These stations were selected to illustrate the differences between ground-based measurements using the same type of instrument, SUV-100 double monochromator spectroradiometers, and satellite estimates of surface UV irradiance under three different environmental conditions (mountains and snow, nearly continuous snow cover, and midlatitude urban sea level conditions). Averaging the measured and TOMS-estimated doses over periods from 1 week to 1 month improves the agreement. The daily or monthly mean bias increases during months when there is snow/ice on the surface. TOMS has a larger estimate of the UV irradiance by 25% at San Diego (no snow), in agreement with the summer-month analysis of Toronto irradiances [Herman et al., 1999]. TOMS underestimates the average daily-UV dose at Ushuaia (monthly mean bias of −13%) and at Palmer (−35%) consistent with snow/ice with cloud effects not being properly accounted for in the TOMS algorithm. When the reflectivity at all three sites is low (no snow), the TOMS irradiance estimate is larger than the SUV-100 measurements consistent with previously analyzed Brewer data at Toronto. The effects of local fog or clouds smaller than the satellite field of view and undetected UV-absorbing aerosols near the ground are discussed. In addition to uncertainties in radiometric calibrations of the spectrometers, none of the SUV-100 data are corrected for deviations of diffuser-transmittance from true cosine response.en_US
dc.description.sponsorship. The authors wish to thank NSF for providing the UV data and for useful information. We also thank Antti Arola and Tuomo Tikkanen for reading the manuscript. This work was supported under contract numbers ENVY-CT97-0401 and ENVY-CT95-0165 of the Environment and Climate RTD Program of the European Commissionen_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/1999JD900926en_US
dc.format.extent9 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2cjo5-tkam
dc.identifier.citationKalliskota, S., Kaurola, J., Taalas, P., Herman, J. R., Celarier, E. A., and Krotkov, N. A. (2000), Comparison of daily UV doses estimated from Nimbus 7/TOMS measurements and ground-based spectroradiometric data, J. Geophys. Res., 105( D4), 5059– 5067, doi:10.1029/1999JD900926.en_US
dc.identifier.urihttps://doi.org/10.1029/1999JD900926
dc.identifier.urihttp://hdl.handle.net/11603/28430
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.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.titleComparison of daily UV doses estimated from Nimbus 7/TOMS measurements and ground-based spectroradiometric dataen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-9146-1632en_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Journal of Geophysical Research Atmospheres - 2000 - Kalliskota - Comparison of daily UV doses estimated from Nimbus 7.pdf
Size:
907.74 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.56 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

UMBC GESTAR II
UMBC Joint Center for Earth Systems Technology (JCET)