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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 #d88oct46

"Contaminated Aquifers are a Forgotten Component of the Global N2O Budget," D. Ronen (Res. Dept., Hydrolog. Svc., POB 6381 Jerusalem 91063, Israel), M. Magaritz, E. Almon, Nature, 335(6185), 57-59, Sep. 1, 1988.

As oceans are not considered a major source of, or a sink for N2O, estimates have been made of global fluxes from continental ecosystems; groundwater aquifers have never been considered in global budgeting of N2O. Authors find that the concentration of N2O in phreatic aerobic aquifers contaminated by anthropogenic activities are up to three orders of magnitude higher than the concentration expected as a result of equilibrium with the atmosphere.

Item #d88oct47

"Tropical Forests and the Global Carbon Cycle," R.P. Detwiler, C.A.S. Hall (College Environ. Sci. & Forestry, State Univ. N.Y., Syracuse NY 13210), Science, 239(4835), 42-47, Jan. 1, 1988.

New data on the three major determinants of the carbon released from tropical forest clearing are used in a computer model that simulates land use change and its effects on the carbon content of vegetation and soil to calculate the net flux of carbon dioxide between tropical ecosystems and the atmosphere. These estimates are lower than many previous ones because lower biomass estimates and slightly lower land clearing rates were used and because ecosystem recovery processes were included. The new estimates make possible a balanced global budget given the large remaining uncertainties in the marine, terrestrial, and fossil fuel components of the carbon cycle.

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