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AGU journal highlights - 6 January 2004

ve enough precursor nitrogen pollutants to cause a three percent reduction in harmful nitrogen oxides in the troposphere [lowest part of the atmosphere] worldwide. The study used a more realistic atmospheric model than previous studies that measured the nitrogen deposition only during nighttime, when plant absorption would be minimized. The researchers suggest that the extent of plant uptake can provide insights on the global and regional budgets of near-surface carbon and nitrogen.

Title: The uptake of gaseous organic nitrogen by leaves: A significant global nitrogen transfer process
Authors: Jed P. Sparks, Cornell University, Ithaca, New York, and Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, Colorado; James M. Roberts, Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, and Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, Colorado; Russell K. Monson, University of Colorado, Boulder, Colorado, and Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, Colorado.
Source: Geophysical Research Letters (GL) paper 10.1029/2003GL018578, 2003
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8. GRACE may provide unprecedented ocean current data
The initial gravity model of the recently launched GRACE [Gravity Recovery and Climate] mission has been combined with results from satellite altimeter missions to study ocean surface currents. The preliminary results from this effort provide a dramatic improvement over previous observations. Tapley et al. show that ocean topography data from the GRACE global gravity model closely correspond with surface observations and note that, for the first time, all major current systems can be clearly observed from space. Previous satellite data produced a higher error level
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Contact: Harvey Leifert
hleifert@agu.org
202-777-7507
American Geophysical Union
6-Jan-2004


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