A Satellite-based Biosphere Parameterization for Net Ecosystem CO2 Exchange: Vegetation Photosynthesis and Respiration Model (VPRM)

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A Satellite-based Biosphere Parameterization for Net Ecosystem CO2 Exchange: Vegetation Photosynthesis and Respiration Model (VPRM)

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dc.contributor.author Gottlieb, Ellaine W.
dc.contributor.author Chow, Victoria Ye
dc.contributor.author Munger, J. William
dc.contributor.author Gerbig, Christoph
dc.contributor.author Lin, John C.
dc.contributor.author Dunn, Allison L.
dc.contributor.author Xiao, Xiangming
dc.contributor.author Matross, Daniel M.
dc.contributor.author Mahadevan, Pathmathevan
dc.contributor.author Wofsy, Steven C.
dc.date.accessioned 2009-09-28T15:23:11Z
dc.date.issued 2008
dc.identifier.citation Mahadevan, Pathmathevan, Steven C. Wofsy, Daniel M. Matross, Xianming Xiao, Allison L. Dunn, John C. Lin, Christoph Gerbig, J. William Munger, Victoria Ye Chow, and Ellaine W. Gottlieb. 2008. A satellite-based biosphere parameterization for net ecosystem CO2 exchange: Vegetation photosynthesis and respiration model (VPRM). Global Biogeochemical Sciences 22: GB2005 en_US
dc.identifier.issn 0886-6236 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3322246
dc.description.abstract We present the Vegetation Photosynthesis and Respiration Model (VPRM), a satellite-based assimilation scheme that estimates hourly values of Net Ecosystem Exchange (NEE) of CO2 for 12 North American biomes using the Enhanced Vegetation Index (EVI) and Land Surface Water Index (LSWI), derived from reflectance data of the Moderate Resolution Imaging Spectroradiometer (MODIS), plus high-resolution data for sunlight and air temperature. The motivation is to provide reliable, fine-grained first-guess fields of surface CO2 fluxes for application in inverse models at continental and smaller scales. An extremely simple mathematical structure, with minimal numbers of parameters, facilitates optimization using in situ data, with finesse provided by maximal infusion of observed NEE and environmental data from networks of eddy covariance towers across North America (AmeriFlux and Fluxnet Canada). Cross validation showed that the VPRM has strong prediction ability for hourly to monthly timescales for sites with similar vegetation. The VPRM also provides consistent partitioning of NEE into Gross Ecosystem Exchange (GEE, the light-dependent part of NEE) and ecosystem respiration (R, the light-independent part), half-saturation irradiance of ecosystem photosynthesis, and annual sum of NEE at all eddy flux sites for which it is optimized. The capability to provide reliable patterns of surface flux for fine-scale inversions is presently limited by the number of vegetation classes for which NEE can be constrained by the current network of eddy flux sites and by the accuracy of MODIS data and data for sunlight. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.description.sponsorship Engineering and Applied Sciences en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.isversionof http://dx.doi.org/10.1029/2006GB002735 en_US
dash.license OAP
dc.title A Satellite-based Biosphere Parameterization for Net Ecosystem CO2 Exchange: Vegetation Photosynthesis and Respiration Model (VPRM) en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Global Biogeochemical Sciences en_US
dash.depositing.author Wofsy, Steven C.
dc.date.available 2009-09-29T07:30:49Z

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  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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