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Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d89feb47

"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 times.

Item #d89feb48

"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.

Item #d89feb49

"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 1988.

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.

Item #d89feb50

"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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