HR: 0800h
AN: A51B-0059 [Abstracts]
TI: Relative contribution of climate variability and vegetation phenology to biogenic emissions: Results
from regional study in Texas, USA
AU: * Gulden, L E
EM: gulden@mail.utexas.edu
AF: Department of Geological Sciences, John R. and Katherine G. Jackson School of Geosciences, University of
Texas at Austin, 1 University Station #C1100, Austin, TX 78712-0254
United States
AU: Yang, Z
EM: liang@mail.utexas.edu
AF: Department of Geological Sciences, John R. and Katherine G. Jackson School of Geosciences, University of
Texas at Austin, 1 University Station #C1100, Austin, TX 78712-0254
United States
AU: Niu, G
EM: niu@speer.geo.utexas.edu
AF: Department of Geological Sciences, John R. and Katherine G. Jackson School of Geosciences, University of
Texas at Austin, 1 University Station #C1100, Austin, TX 78712-0254
United States
AB:
A regional land-surface model equipped with a dynamic vegetation module is used to characterize the interannual variability
in biogenic volatile organic compound (BVOC) emissions in Texas. The Community Land Model 3.0 with the Dynamic Global
Vegetation Module (CLM3-DGVM) is driven at 0.1§ resolution from 1979 to 2004 using bilinearly interpolated North American
Regional Reanalysis (NARR) meteorological forcing data. A ground-referenced, species-based vegetation dataset converted for
use in CLM3-DGVM is used to characterize land-cover conditions for the model run. BVOC emissions capacities based on the
emission capacities of plant species native to Texas are assigned to each plant functional type.
CLM3-DGVM allows modeled leaf area index to respond to variations in meterologic input. Because the modeled BVOC flux depends
in large part on available leaf biomass, simulations using CLM3-DGVM are expected to provide a more realistic assessment of
the interannual variability of BVOC emissions than simulations that do not employ a dynamic vegetation module.
Total simulated BVOC flux is a function of environmental variation over short time scales (e.g., changes in leaf-surface
temperature), over moderately long time scales (e.g., interannual variation in seasonal leaf area index), and over long time
scales (i.e., changes in the type of vegetation covering landscape). This study evaluates the relative contribution of
short-term and moderate-term environmental variation in determining total BVOC flux.
Model output is used as a foundation to discuss the potential effects of future climate change on BVOC emissions in Texas.
Current governmental characterization of biogenic emissions is briefly evaluated.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0466 Modeling
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005