February 28, 2007
GCRIO Program Overview
Our extensive collection of documents.
Archives of the
Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 6, NUMBER 10, OCTOBER 1993
"Tropospheric Ozone and Climate Change," V.A. Mohnen
(Dept. Atmos. Sci., SUNY-Albany, 100 Fuller Rd., Albany NY
12205), W. Goldstein, W.-C. Wang, Air & Waste, 43(10),
1332-1344, Oct. 1993.
A new round of scientific concern will be devoted to the
observed increase in tropospheric ozone in the Northern
Hemisphere, which will influence global warming. Reviews the
processes contributing to ozone changes, the observational
evidence for them, and the results of model simulations of past
and future radiative forcing caused by increasing ozone in the
upper troposphere. Estimates that over the next two decades,
increased aircraft emissions of nitric oxide will lead to a
radiative forcing equivalent to 10-25% of that attributable to CO2
"1992 Brings Return to Moderate Global Temperatures,"
M.S. Halpert (Nat. Weather Serv., NMC, NOAA, Washington DC
20233), C.F. Ropelewski et al., Eos, 74(38), 433,
437-439, Sep. 21, 1993.
Examines how natural events such as Mt. Pinatubo and the El
Niņo/Southern Oscillation returned global temperatures to
moderate levels after several years of near-record highs.
"Effect of Pasture Age on Soil Trace-Gas Emissions from a
Deforested Area of Costa Rica," M. Keller (Intl. Inst.
Tropical For., USDA For. Serv., Call Box 25000, Rio Piedras,
Puerto Rico 00928), E. Veldkamp et al., Nature, 365(6443),
244-246, Sep. 16, 1993.
Measurements on Puerto Rican pasture of various ages show that
nitrogen oxide emissions peak during the first 10 years after
conversion. Previous studies have overestimated the contribution
of pastures to the global budget of N2O, emissions of
which depend on land-use history.
related items from Nature, 365(6442), Sep. 9, 1993:
"Ice Sheets, Wayward winds and Sea Change," S.
Lehman (Woods Hole Oceanog. Inst., Woods Hole MA 02543), 108-110.
Comments on the following paper.
"Correlations Between Climate Records from North Atlantic
Sediments and Greenland Ice," G. Bond (Lamont-Doherty Earth
Observ., Palisades NY 10964), W. Broecker et al., 143-147.
Confirms that the rapid temperature fluctuations of the last
glaciation seen in ice cores are also seen in ocean sediments.
The details of the sediment temperature history also indicate a
previously unrecognized link between ice sheet behavior and ocean
"Stratospheric Ozone Depletion by ClONO2 Photolysis,"
R. Toumi (Ctr. Atmos. Sci, Univ. Cambridge, Lensfield Rd.,
Cambridge CB2 1EW, UK), R.L. Jones, J.A. Pyle, Nature, 365(3441),
37-39, Sep. 2, 1993.
ClONO2, found in polar air and at lower latitudes,
can lead to ozone depletion. Model simulations for the Arctic
vortex and a mid-latitude site show increasing ozone loss from
March to May, apparently due to ClONO2. The mechanism
may be important in middle latitude ozone loss.
"Primary Production Control of Methane Emission from
Wetlands," G.J. Whiting (Dept. Biol., C. Newport Univ.,
Newport News VA 23606), J.P. Chanton, ibid., 364(6440),
794-795, Aug. 26, 1993.
Simultaneous measurements of CO2 and CH4
exchange in a variety of wetlands suggest a positive correlation
between CH4 emissions and net ecosystem production.
Because elevated CO2 levels are expected to stimulate
primary production and soil microbial activity in wetlands, the
global rise in atmospheric CO2 has the potential for
increasing CH4 emissions from inundated wetlands,
further enhancing the greenhouse effect.
"Wavelengths Effective in Induction of Malignant
Melanoma," R.B. Setlow (Biol. Dept., Brookhaven Nat. Lab,
Upton NY 11973), E. Grist et al., Proc. Nat. Acad. Sci., 90(14),
6666-6670, July 1993.
Laboratory exposure of fish to various wavelengths of light
indicate that 90-95% of the melanoma induction by natural
sunlight may be attributed to wavelengths in the UV-A and visible
spectral regions. This result suggests that ozone depletion would
have a minor effect on skin cancer incidence. (See news article
references in Research News.)
Hydrates--Geological Perspective and Global Change," K.A.
Kvenvolden (US Geol. Survey, MS 999, 345 Middlefield Rd., Menlo
Pk. CA 94025), Rev. Geophys., 31(2), 173-187, May
Icelike gas hydrate deposits, normally associated with
permafrost and the ocean floor, represent a large amount of
methane within 2000 m of the Earth's surface. Changes in pressure
and temperature affect their stability, making them a
consideration in climate change.
Role of the Stratosphere in Climate Change," D. Rind (NASA
Goddard Inst. Space Studies, 2880 Broadway, New York NY 10025),
A. Lacis, Surveys Geophys., 14(2), 133-165, Mar.
1993. Reviews a variety of mechanisms by which alterations in the
chemical and physical nature of the stratosphere could affect
climate, in the light of incorporation of middle atmosphere
studies into the IGBP.
Guide to Publishers
Index of Abbreviations