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Proceedings Paper

Real-time UV and column ozone from multichannel UV radiometers deployed in the National Science Foundation's UV monitoring network
Author(s): Germar Bernhard; Charles Rocky Booth; James C. Ehramjian
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Paper Abstract

Multi-channel moderate-bandwidth GUV filter radiometers have recently been added to the suite of instruments deployed in the US National Science Foundation Office of Polar Programs' UV monitoring network. The GUV instruments complement the stations' SUV-100 high-resolution scanning spectroradiometers, which have been monitoring UV levels in Antarctica, South America, and Alaska for more than a decade. The GUV instruments are used to help quality control SUV measurements, and to calculate total column ozone and a variety of biologically relevant UV integrals and dose-rates in real time. The results are updated every minute on web pages, and can be accessed via the website, or the stations' intranets. Online data may guide researchers on station in planning experiments, or for "first-look" analysis. The instruments underwent a detailed characterization. Their spectral response functions were measured with an apparatus that was specifically designed for this purpose. The apparatus and the data analysis method are described in detail with special attention given to a deconvolution method to correct measured data for the finite spectral resolution of the apparatus. The impact of uncertainties in measuring the spectral response of GUV channels on solar measurements is discussed. The GUV instruments are calibrated by comparison with a SUV-150B spectroradiometer, and dose-rates for 15 different biological action spectra are calculated based on an algorithm suggested by Dahlback. A comparison of calibrated GUV and SUV data indicates that erythemal (CIE) irradiance can be derived from GUV measurements to within 3% relative to the SUV up to a solar zenith angle (SZA) of 80°. A similar level of agreement can also be reached for other action spectra. Ozone values derived from GUV measurements at San Diego agree to within 3 Dobson Units (DU) with SUV ozone data and within a few DU with Earth Probe TOMS satellite observations.

Paper Details

Date Published: 4 November 2003
PDF: 12 pages
Proc. SPIE 5156, Ultraviolet Ground- and Space-based Measurements, Models, and Effects III, (4 November 2003); doi: 10.1117/12.509132
Show Author Affiliations
Germar Bernhard, Biospherical Instruments Inc. (United States)
Charles Rocky Booth, Biospherical Instruments Inc. (United States)
James C. Ehramjian, Biospherical Instruments Inc. (United States)

Published in SPIE Proceedings Vol. 5156:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects III
James R. Slusser; Jay R. Herman; Wei Gao, Editor(s)

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