HR: 0800h
AN: A51B-0040    [Abstracts]
TI: The Effect of Global Change on Surface Ozone and Reactive Nitrogen Concentrations: Implications for the Biosphere
AU: * Hess, P G
EM: hess@ucar.edu
AF: National Center Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305
AU: Murazaki, K
EM: kadachi@mri-jma.go.jp
AF: Meteorological Research Institute, Nagamine 1-1, Tsukuba, 305 Japan
AU: Emmons, L
EM: emmons@ucar.edu
AF: National Center Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305
AU: Lamarque, J
EM: lamar@ucar.edu
AF: National Center Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305
AB: We simulated two ten year periods using the global chemical transport model MOZART-2 (Model of Ozone and Related chemical Tracers version 2): 1990-2000 and 2090-2100. In each case MOZART-2 is driven by meteorology from the National Center for Atmospheric Research (NCAR) coupled Climate Systems Model (CSM) 1.0 forced with the (SRES) A1 scenario. Profound future changes in the summertime climate over the U.S. are found including changes in temperature, water vapor and clouds and the frequency of synoptic venting of the boundary layer. Even allowing for no changes in emissions in the future, the changes in climate alone drive a significant increase in the ozone concentration over the eastern U.S. (up to 5 ppbv on average) and an increase in the persistence of pollution events. Implications of these changes on the biosphere are assessed with and without allowing for the impact of climate on biogenic emissions. Furthermore the changes in climate alone cause large changes in the partitioning of NOy, decreasing PAN by over 20% over the U.S. Coupled with changes in precipitation; this induces significant changes in the deposition of nitrogen species to the biosphere in a future climate.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005