Vegetation
strongly influences the spatial distribution of sensible and latent heat
fluxes, and also controls ecosystem-atmosphere CO2 exchange. We
describe here a methodology to estimate surface energy fluxes and Net Ecosystem
Exchange (NEE) of CO2 continuously over the Southern Great Plains,
using (1) data from the U.S. Department of Energy Atmospheric Radiation
Measurement (ARM) program in
Oklahoma and Kansas; (2) meteorological forcing data from Mesonet facilities;
(3) U.S. Geological Survey (USGS) soil database; (4) MODIS NDVI at 250 meters
resolution; and (5) a tested carbon and isotope land-surface model (ISOLSM,
based on LSM1.0 [Bonan 1996]). The
need for distributed ecosystem modeling was demonstrated by the large spatial
variability in CO2 fluxes across the region, which is typically
modeled as homogeneous cropland. This work addresses U.S. national goals of
estimating regional CO2 sources and sinks, and
provides inputs to forward and inverse models.
Author: S.C. Biraud, W.J. Riley, M.L. Fischer, M.S. Torn, J.A. Berry (scbiraud at lbl dot gov)
Filesize: 424.23 Kb