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 2, NUMBER 2, FEBRUARY 1989
"Deforestation Alters Denitrification in a Lowland Tropical Rain
Forest," G.P. Robertson (Dept. Crop & Soil Sci., Michigan State Univ.,
Hickory Corners MI 49060), J.M. Tiedje, Nature, 336(6201),
756-759, Dec. 22/29, 1988.
Reports measurements of denitrification at sites in Central America made to
determine whether nitrogen gas loss is related to the successional status of
rain-forest vegetation. Denitrification is high primarily in mid-successional
sites, implying denitrification can be a major route of nitrogen loss from
recently cleared and primary forest sites and that global denitrification losses
from humid tropical regions today are probably much smaller than in pre-colonial
"Uptake of COS by Growing Vegetation: A Major Tropospheric Sink,"
P.D. Goldan (NOAA-ERL, R/E/AL7, Boulder CO 80303), R. Fall et al.,
J. Geophys. Res., 93(D11), 14,186-14,192, Nov. 20, 1988.
Increasing anthropogenic emissions of COS have the potential of causing
measurable alterations in climate. Laboratory measurements of COS uptake were
made as a means of estimating global COS uptake from estimates of global
terrestrial primary plant productivity. Results indicate that, with an estimated
annual plant uptake of 0.2-0.6 Tg COS, this appears to be the largest global
sink for this major tropospheric sulfur reservoir species. Including this sink
brings estimated known sources and sinks in balance.
"Production of N2O, CH4 and CO2 from Soils in the Tropical Savanna
During the Dry Season," W.M. Hao (Max Planck Inst., POB 3060, D-6500 Mainz,
FRG), D.Scarffe et al., J. Atmos. Chem., 7(1), 93-105, July
Measured arithmetic mean fluxes of N2O, CH4 and CO2 from undisturbed soil
plots to the atmosphere were 2.5 x 109, 4.3 x 1010, and 3.0 x 1013 molecules
cm-2 s-1, respectively. Emissions of N2O increased fourfold after simulated
rainfall, while fluxes of CO2 increased ninefold two hours after simulated
rainfall and remained three times higher than normal after 16 hours. These
fluxes were not significantly affected by burning the grass layer.
"Carbon Tetrachloride Lifetimes and Emissions Determined from Daily
Global Measurements During 1978-1985," P.G. Simmonds (Dept. Geochem, Univ.
Bristol, Bristol, UK), D.M. Cunnold et al., ibid., 35-58.
Determined that CCl4 has accumulated in the atmosphere at the rate of 1.3 +
or - 0.1%/yr over the given period while the releases of CCl4 remained fairly
constant. Using an inversion scheme based on a nine-box model of the atmosphere,
the authors infer a CCl4 lifetime of about 40 years. These results produce
excellent agreement with a release scenario derived from global production
estimates for CCl4 and the major CCl4 byproduct, the chlorofluorocarbons.
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