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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 #d99mar15

“Potential Effects of Differential Day-Night Warming in Global Climate Change on Crop Production,” G. B. Dhakhwa and C. L. Campbell,Climatic Change 40, 647-667 (1998).

GCMs and a plant-process model were used to study the effects of asymmetric climate change (where average nighttime temperatures rise more than daytime ones) on crop productivity. The model results indicated that the effects of asymmetric warming may be less severe than the effects of uniform warming.

Item #d99mar16

“Climate Change Impacts on the Potential Productivity of Corn and Winter Wheat in their Primary United States Growing Regions,” R. A. Brown and N. J. Rosenberg,Climatic Change 40, 73-107 (1999).

GCMs and plant-process models were used to assess the crop responses of dryland winter wheat and corn in the major U.S. production regions to increases in temperature and CO2 concentration. Increasing the global mean temperature 1° C decreased wheat and corn production only marginally. Temperature increases of 2.5 and 5.0° C were also modeled and, in the various models employed, produced wheat-production declines ranging from 36 to 76% and lesser corn-production declines. Increases in CO2 concentration had positive effects on both wheat and corn production (an 18 to 29% increase for wheat and a 2 to 5% increase for corn) with no temperature increases, but did not keep up with the declines when combined with higher temperatures.

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