February 28, 2007
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A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 5, NUMBER 10, OCTOBER 1992
"Two items from Nature, 358(6385), July 30, 1992:
"An Air-Conditioned Greenhouse," G. Stephens (Dept. Atmos. Sci.,
Colorado State Univ., Fort Collins CO 80523), T. Slingo, 369-370.
Discusses the following paper and its bearing on the hypothesis of
Ramanathan and Collins that a "natural thermostat" prevents sea
surface temperature from rising above 305 K. Since cause and effect are
difficult to separate, the hypothesis can perhaps only be tested fully when
reliable coupled models of the ocean-atmosphere system are developed.
"Cirrus-Cloud Thermostat for Tropical Sea Surface Temperatures Tested
Using Satellite Data," R. Fu (Dept. Atmos. Sci., Univ. California, Los
Angeles CA 90024), A.D. Del Genio et al., 394-397.
Satellite data show that during the 1987 El Niño event, large-scale
perturbations to the radiative effects of cirrus clouds were controlled by
changes in large-scale circulation rather than directly by SSTs. Concludes that
the thermostat mechanism involving cirrus clouds proposed by Ramanathan and
Collins does not exist.
"Several-Fold Enhancement of Biologically Effective Ultraviolet
Radiation Levels at McMurdo Station, Ant-arctica, during the 1990 Ozone Hole,"
K. Stamnes (Geophys. Inst., Univ. Alaska, Fairbanks AK 99775), Z. Jin, J.
Slusser, Geophys. Res. Lett., 19(10), 1013-1016, May 22, 1992.
Spectral measurements of biologically relevant radiation in October exceeded
values expected for undepleted ozone levels by factors of three to six. The
estimated dose rate for damage to the DNA molecule was well above normal levels
most of the time between Oct. 1 and Dec. 5, reaching three times the normal
value for a few days in October.
"Structure of Continental Clouds before the Industrial Era: A
Mystery to Be Solved," E. Mészáros (Inst. Atmos. Phys.,
H-1675 Budapest, POB 39, Hungary), Atmos. Environ., 26A(13),
2469-2470, Sep. 1992.
Present knowledge suggests that nearly the entire population of cloud
condensation nuclei over continents is anthropogenic. If true, the nature of
continental CCN before the industrial era must be clarified. Comments follow by
W.G.N. Slinn, pp. 2471-2473, and by R.S. Scorer, p. 2475.
"The DMS-Cloud Albedo Feedback Effect: Greatly Underestimated?"
S.B. Idso (U.S. Water Conserv. Lab., Phoenix AZ 85040), Clim. Change,
21(4), 429-433, Aug. 1992. Discusses the DMS-cloud feedback hypothesis
in light of recent claims that it is not of sufficient strength to be important.
"GEMI--A Nonlinear Index to Monitor Global Vegetation from
Satellites," B. Pinty (Lab. Étud. Rech. Teledetect. Spatiale,
F-31055 Toulouse, France), M.M. Berstraete, Vegetatio, 101(1),
15-20, July 1992. Proposes a new vegetative index designed to reduce the effect
of atmospheric perturbations on satellite observations, while maintaining
information on vegetation cover.
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