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 12, NUMBER 2, FEBRUARY 1999
Radiation at Sites on the Antarctic Coast, J. H. Frederick
(email@example.com), Zheng Qu, and C. R. Booth, Photochem.
Photobiol. 68 (2), 183-190 (1998).
Variability in the UV radiation impinging on the Palmer and McMurdo
stations in Antarctica from 1979 to 1992 was measured on the ground and
compared with satellite measurements of atmospheric ozone. The satellite
values showed that the October ozone depletion increased between 1979 and
1991, and the noontime UV-B measurements showed an increase of 50 to 65%
(depending on location) during that period. When these values were
factored into the biologically weighted irradiance, it indicated a 5 to 6%
increase in the suppression of photosynthesis in Antarctic phytoplankton
during the period. Measurements taken from 1990 to 1994 indicated that
interannual variations in cloudiness were more important than changes in
ozone in determining the interannual variability in UV-B exposure on the
of Effective Erythemal Irradiance Measurements from Two Types of
Broad-Band Instruments, During June 1995, Stephen Wengraitis,
Danielle Benedetta, and D. H. Sliney, Photochem. Photobiol. 68
(2), 179-182 (1998).
Measurements from a multiband UV monitor were compared with those from a
conventional broadband UV monitor for the month of June. Daily total
exposures of each instrument and intraday ratios between the two
instruments were recorded. Averaged over the month, the daily total
exposures agreed within 11%. The ratio of the two readings varied by time
of day; it was 1.12 from 9 am to 5 pm and decreased below 0.90 outside
that time period. Spectral- response and cosine-response mismatch are
suspected to be the causes of these variations.
as a Personal Dosimeter for Solar UV-B, Ronald Rahn and M. A. Lee,
Photochem. Photobiol. 68 (2), 173- 178 (1998).
Iodouracil and potassium iodide in borate buffer forms triiodide on
exposure to UV-B radiation. If thyodene is present, the common blue
starch-iodine complex is formed, and its intensity is proportional to the
UV-B exposure. The endpoint was determined with a spectrometer set at 400
nm and a densitometer, and selectivity for UV-B was demonstrated with a
UV-B cutoff filter. This system could be used in a personal UV-B
dosimeter, with the dosage being estimated by visual inspection or
measured by UV spectroscopy.
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