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dc.contributor.authorMahadevan, Pathmathevan
dc.contributor.authorWofsy, Steven C.
dc.contributor.authorMatross, Daniel M.
dc.contributor.authorXiao, Xiangming
dc.contributor.authorDunn, Allison L.
dc.contributor.authorLin, John C.
dc.contributor.authorGerbig, Christoph
dc.contributor.authorMunger, J. William
dc.contributor.authorChow, Victoria Ye
dc.contributor.authorGottlieb, Ellaine W.
dc.date.accessioned2009-09-28T15:23:11Z
dc.date.issued2008
dc.identifier.citationMahadevan, 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: GB2005en_US
dc.identifier.issn0886-6236en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3322246
dc.description.abstractWe 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.sponsorshipEarth and Planetary Sciencesen_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.isversionofhttp://dx.doi.org/10.1029/2006GB002735en_US
dash.licenseOAP
dc.titleA Satellite-based Biosphere Parameterization for Net Ecosystem CO2 Exchange: Vegetation Photosynthesis and Respiration Model (VPRM)en_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalGlobal Biogeochemical Sciencesen_US
dash.depositing.authorWofsy, Steven C.
dc.date.available2009-09-29T07:30:49Z
dc.identifier.doi10.1029/2006GB002735*
dash.contributor.affiliatedWofsy, Steven


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