Atmosphere-Biosphere Carbon Exchange in New England and Quebec During Summer 2004 From a Receptor Oriented Modeling Framework

HR: 15:25h
AN: B53A-08 [Abstracts]
TI: Atmosphere-Biosphere Carbon Exchange in New England and Quebec During Summer 2004 From a Receptor Oriented Modeling Framework
AU: * Matross, D M
EM: matross@fas.harvard.edu
AF: Dept. Earth and Planetary Sci. and Div. Eng. and Appl. Sci., Harvard University, 20 Oxford St., Cambridge, MA 02138 United States
AU: Pathmathevan, M
EM: devan@deas.harvard.edu
AF: Dept. Earth and Planetary Sci. and Div. Eng. and Appl. Sci., Harvard University, 20 Oxford St., Cambridge, MA 02138 United States
AU: Gerbig, C
EM: christoph.gerbig@bgc-jena.mpg.de
AF: Max-Planck-Institut f〉 Biogeochemie, Hans-Knoell-Str. 10, JENA, D-07745 Germany
AU: Lin, J C
EM: jcl@atmos.colostate.edu
AF: Dept. Atmospheric Sci., Colorado State University, 1371 Campus Delivery, Fort Collins, CO 80523-1371 United States
AU: Andrews, A
EM: Arlyn.Andrews@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Lee, J T
EM: jtlee@maine.edu
AF: Envir. Phys. Group, University of Maine,Dept. PSE, Rm. 103 Envir. Sci. Labs, Orono, ME 04469 United States
AU: Zhao, C
EM: Conglong.Zhao@noaa.gov
AF: Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, CO 80305 United States
AU: Bakwin, P
EM: pbakwin@comcast.net
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Munger, J W
EM: jwm@io.harvard.edu
AF: Dept. Earth and Planetary Sci. and Div. Eng. and Appl. Sci., Harvard University, 20 Oxford St., Cambridge, MA 02138 United States
AU: Hollinger, D
EM: davidh@hypatia.unh.edu
AF: USDA Forest Service, 271 Mast Rd, Durham, NH 03824 United States
AU: Wofsy, S C
EM: Steven_Wofsy@harvard.edu
AF: Dept. Earth and Planetary Sci. and Div. Eng. and Appl. Sci., Harvard University, 20 Oxford St., Cambridge, MA 02138 United States
AB: We quantify atmosphere-biosphere carbon exchange for spring and summer 2004 in greater New England and Quebec. Our approach is a receptor-oriented modeling framework, consisting of a time-reversed Lagrangian adjoint model (STILT) [Gerbig et al. 2003a,b; Lin et al. 2003] coupled to a vegetation CO₂ flux model that calculates gross primary production and respiration by partitioning photosynthetic and non-photosynthetic respiration, the Vegetation Photosynthesis and Respiration Model (VPRM) [Pathmathevan et al., 2005; Xiao et al., 2004]. To drive atmospheric transport, the adjoint transport model utilizes wind fields from the Colorado State Regional Atmospheric Modeling System (RAMS), the Eta Data Assimilation System 40-km product (EDAS-40), or the Weather Research and Forecasting (WRF) model. The biosphere model incorporates MODIS-derived enhanced vegetation index (EVI) and land surface water index (LSWI) together with GOES-derived shortwave radiation [Diak et al. 2004] to capture surface spatial heterogeneity and variations in soil moisture, canopy nutrition, solar input and phenology. To integrate functional dependence of CO₂ flux, we optimized parameters within VPRM using Ameriflux eddy covariance data. These observations were separated into eight vegetation types, based on GLCC 2.0 land cover classes. These initial biosphere parameters serve as a priori values in a Bayesian optimization method, where the adjoint atmospheric model links the atmospheric measurement at a receptor point to the appropriate footprint at high spatiotemporal resolution within the domain of the biosphere. We focused a priori model runs on receptor points at Harvard Forest and the NOAA-CMDL Argyle tall tower in Maine. These a priori results demonstrate remarkably close agreement with in-situ CO₂ measurements, suggesting the VPRM can be scaled up to determine a priori regional carbon exchange for New England and Quebec in summer 2004. We scale up a posteriori results to produce hourly and monthly average regional carbon exchange estimates optimized in New England and Quebec, with corresponding estimates of uncertainty.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
SC: Biogeosciences [B]
MN: Fall Meeting 2005