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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1543–1551

Comparison of column ozone retrievals by use of an UV multifilter rotating shadow-band radiometer with those from Brewer and Dobson spectrophotometers

James Slusser, James Gibson, David Bigelow, Donald Kolinski, Wanfeng Mou, Gloria Koenig, and Arthur Beaubien  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1543-1551 (1999)
http://dx.doi.org/10.1364/AO.38.001543


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Abstract

The U.S. Department of Agriculture UV-B Monitoring Program measures ultraviolet light at seven wavelengths from 300 to 368 nm with an ultraviolet multifilter rotating shadow-band radiometer (UV-MFRSR) at 25 sites across the United States, including Mauna Loa, Hawaii. Column ozone has been retrieved under all-sky conditions near Boulder, Colorado (40.177 °N, 105.276 °W), from global irradiances of the UV-MFRSR 332- and 305-nm channels (2 nm FWHM) using lookup tables generated from a multiple-scattering radiative transfer code suitable for solar zenith angles (SZA’s) up to 90°. The most significant sources of error for UV-MFRSR column ozone retrievals at SZA’s less than 75° are the spectral characterizations of the filters and the absolute calibration uncertainty, which together yield an estimated uncertainty in ozone retrievals of ±4.0%. Using model sensitivity studies, we determined that the retrieved column ozone is relatively insensitive (<±2%) to typical variations in aerosol optical depth, cloud cover, surface pressure, stratospheric temperature, and surface albedo. For 5 months in 1996–1997 the mean ratio of column ozone retrieved by the UV-MFRSR divided by that retrieved by the collocated Brewer was 1.024 and for the UV-MFRSR divided by those from a nearby Dobson was 1.025. The accuracy of the retrieval becomes unreliable at large SZA’s of more than 75° as the detection limit of the 305-nm channel is reached and because of overall angular response errors. The UV-MFRSR advantages of relatively low cost, unattended operation, automated calibration stability checks using Langley plots, and minimal maintenance make it a unique instrument for column ozone measurement.

© 1999 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(010.4950) Atmospheric and oceanic optics : Ozone
(040.7190) Detectors : Ultraviolet
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(350.2460) Other areas of optics : Filters, interference

History
Original Manuscript: May 12, 1998
Revised Manuscript: October 19, 1998
Published: March 20, 1999

Citation
James Slusser, James Gibson, David Bigelow, Donald Kolinski, Wanfeng Mou, Gloria Koenig, and Arthur Beaubien, "Comparison of column ozone retrievals by use of an UV multifilter rotating shadow-band radiometer with those from Brewer and Dobson spectrophotometers," Appl. Opt. 38, 1543-1551 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1543


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