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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 #d94may11

"Growth of Continental-Scale Metro-Agro-Plexes, Regional Ozone Pollution, and World Food Production," W.L. Chameides (Sch. Geophys. Sci., Georgia Inst. Technol., Atlanta GA 30332), P.S. Kasibhatla et al., Science, 264(5155), 74-77, Apr. 1, 1994.

The three metro-agro-plexes of the northern mid-latitudes account for most of the world's commercial energy consumption, fertilizer use, food-crop production and food export, as well as for nitrogen oxide emissions that lead to ground-level ozone pollution. Simulations using a global chemical transport model show that exposure of crops to yield-reducing ozone pollution may triple by 2025 if rising anthropogenic NOx emissions are not abated.

Item #d94may12

"Year 2020: Consequences of Population Growth and Development on Deposition of Oxidized Nitrogen," J.N. Galloway (Dept. Environ. Sci., Univ. Virginia, Charlottesville VA 22903), H. Levy II, P.S. Kasibhatla, Ambio, 23(2), 120-123, Mar. 1994.

Calculations using a global chemical model project a 25% increase in total nitrogen deposition by the year 2020 in highly-developed countries, and at least a doubling of reactive nitrogen deposition in less-developed regions. Aside from acidification effects, increased deposition has the potential to fertilize both terrestrial and marine ecosystems, resulting in the sequestering of carbon. It will also increase emissions of nitrous oxide and decrease methane consumption in forest soils. Atmospheric levels of nitrogen oxides will increase over much of the globe, leading to higher ozone concentrations near the Earth's surface and subsequent increases in the oxidative capacity of the remote atmosphere and in its ability to absorb infrared radiation.

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