February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 10, NUMBER 7, JULY 1997
OZONE DEPLETION: UV MEASUREMENTS
"Analysis of Long-Term Behavior of Ultraviolet Radiation Measured by
Robertson-Berger Meters at 14 Sites in the United States," E.C. Weatherhead
(CIRES, Campus Box 449, Univ. Colorado, Boulder CO 80309; e-mail:
email@example.com), G.C. Tiao et al., J. Geophys. Res., 102(D7),
8737-8754, Apr. 20, 1997.
Evaluation of surface UV measurements over the period 1974-1991 initially
showed a -6% per decade trend consistent with negative trends obtained by Scotto
et al. (1998) using similar data. However, after allowing for mean level shifts
at several stations, which may be related to calibration and other instrument
problems, no significant trend was found. The authors attribute this to problems
with the instrument network that render the existing measurements unreliable for
long-term trends; different reasonable treatments of the data result in
dramatically different trends. Future UV monitoring could be improved, for
example, by providing ancillary data on visible radiation and intercomparisons
with satellite information.
"Systematic Long-Term Comparison of Spectral UV Measurements and
UVSPEC Modeling Results," B. Mayer (Fraunhofer Inst. for Atmos. Environ.
Res., Kreuzeckbahnstr. 19, D-82467, Garmisch-Partenkirchen, Ger.; e-mail:
firstname.lastname@example.org), G. Seckmeyer, A. Kylling, J. Geophys. Res., 102(D7),
8755-8767, Apr. 20, 1997.
Evaluation of radiative transfer models, and investigations on the influence
of parameters like aerosols or clouds on ground level UV, require a combination
of spectral measurements and model calculations. This paper presents an
efficient method for such a combination, and the results of a systematic
comparison of the freely available UVSPEC radiative transfer model package with
two years of spectrally resolved measurements.
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