HR: 1340h
AN: B23A-0934 [Abstracts]
TI: Estimation of Regional Net CO2 Exchange over the Southern Great Plains
AU: * Biraud, S C
EM: SCBiraud@lbl.gov
AF: Lawrence Berkeley National Laboratory, One Cyclotron Road MS 90R-1116, Berkeley, CA 94720
United States
AU: Riley, W J
EM: WJRiley@lbl.gov
AF: Lawrence Berkeley National Laboratory, One Cyclotron Road MS 90R-1116, Berkeley, CA 94720
United States
AU: Fischer, M L
EM: MLFischer@lbl.gov
AF: Lawrence Berkeley National Laboratory, One Cyclotron Road MS 90R-1116, Berkeley, CA 94720
United States
AU: Torn, M S
EM: MSTorn@lbl.gov
AF: Lawrence Berkeley National Laboratory, One Cyclotron Road MS 90R-1116, Berkeley, CA 94720
United States
AU: Cooley, H S
EM: HSCooley@lbl.gov
AF: Lawrence Berkeley National Laboratory, One Cyclotron Road MS 90R-1116, Berkeley, CA 94720
United States
AB:
Estimating spatially distributed ecosystem CO2 exchange is an important component of the North American Carbon Program. We
describe here a methodology to estimate Net Ecosystem Exchange (NEE) over the Southern Great Plains, using: (1) data from the
Department Of Energy's Atmospheric Radiation Measurement (ARM) sites in Oklahoma and Kansas; (2) meteorological forcing data
from the Mesonet facilities; (3) soil and vegetation types from 1 km resolution USGS databases; (4) vegetation status (e.g.,
LAI) from 1 km satellite measurements of surface reflectance (MODIS); (5) a tested land-surface model; and (6) a coupled
land-surface and meteorological model (MM5/ISOLSM). This framework allows us to simulate regional surface fluxes in addition
to ABL and free troposphere concentrations of CO2 at a continental scale with fine-scale nested grids centered on the ARM
central facility. We use the offline land-surface and coupled models to estimate regional NEE, and compare predictions to
measurements from the 9 Extended Facility sites with eddy correlation measurements. Site level comparisons to portable ECOR
measurements in several crop types are also presented. Our approach also allows us to extend bottom-up estimates to periods
and areas where meteorological forcing data are unavailable.
UR: http://esd.lbl.gov/ARMCarbon
DE: 3200 MATHEMATICAL GEOPHYSICS (New field)
DE: 1615 Biogeochemical processes (4805)
DE: 0315 Biosphere/atmosphere interactions
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting