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AGU journal highlights - 6 January 2004

tails were the result of a hollow cylinder because of inconsistencies between the theory and observed light emissions from the plumes. They conclude that their explanation may solve the long-standing problem of explaining the phenomenon.

Title: A new explanation of persistent double meteor trains
Authors: M. C. Kelley, C. Kruschwitz, L. Gelinas, S. Collins, Cornell University, Ithaca, New York; J. Drummond, Starfire Optical Range, Kirtland Air Force Base, New Mexico; C. Gardner, University of Illinois at Urbana-Champaign, Urbana, Illinois; J. Hecht, The Aerospace Corporation, Los Angeles, California; E. Murad, Hanscom Air Force Base, Massachusetts.
Source: Geophysical Research Letters (GL) paper 10.1029/2003GL018312, 2003
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4. Climate models should include carbon dioxide increases
The impact of land cover change in climate models may be incorrectly interpreted if the vegetation response to greater atmospheric carbon dioxide concentrations is not taken into account. Narisma et al. suggest that climate models should include a measure of vegetation response to natural and man-made carbon dioxide increases during the 20th century to accurately account for biospheric feedback. The researchers examined the specific impacts of elevated atmospheric carbon dioxide concentrations during the Australian summer and report that the plant response to increased carbon dioxide influences atmospheric temperatures and the climate in ways that are not currently captured by climate models. They conclude that simulations of land cover changes that exclude biospheric feedback may lead both regional and global models to overestimate the impact of land cover change on heat flux and temperatures.

Title: The role of biospheric feedbacks in the simulation of the impact of historical land cover change on the Australian January clim
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Contact: Harvey Leifert
hleifert@agu.org
202-777-7507
American Geophysical Union
6-Jan-2004


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