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TRANSCOM3_LEVEL2 TransCom 3: Seasonal CO2 Flux Estimates from Atmospheric Inversions (Level 2) GURNEY, K.R.; DENNING, A.S. TransCom 3: Seasonal CO2 Flux Estimates from Atmospheric Inversions (Level 2) 2013 Oak Ridge, Tennessee, U.S.A. Oak Ridge National Laboratory Distributed Active Archive Center Online Files doi:10.3334/ORNLDAAC/1198 1198

ABSTRACT: This data set provides model outputs and seasonal mean CO2 fluxes from the Atmospheric Carbon Cycle Inversion Intercomparison (TransCom 3), Level 2 inversion experiment. Inversion methods can be used to estimate surface CO2 fluxes from atmospheric CO2 concentration measurements, given an atmospheric transport model to relate the two. This Level 2 experiment inverted for the spatial and temporal pattern of the residual CO2 sources and sinks. There were 12 atmospheric tracer transport models utilized in this experiment. The data inverted were mean CO2 concentration data from 75 sites from the GLOBALVIEW-CO2 2000 data set for the period 1990-1996. The seasonal inversion consists of a 3 year forward simulation (365 days per year) containing 4 presubtracted tracers, 11 SF6 tracers, and 22 CO2 tracers (11 terrestrial, 11 oceanic) (Gurney et al., 2000). Carbon fluxes were estimated for each month of an average year determined as the mean of the 1992-1996 time period from an intercomparison of 12 different atmospheric tracer transport models. This data set provides input data, model output data,the cyclo inversion code, a basis function map, and estimated fluxes.

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Oak Ridge Tennessee 37831-6407 USA 2013-11-19 ORNL_DAAC THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) http://daac.ornl.gov/ 1198 DATA CENTER CONTACT ORNL DAAC USER SERVICES ornldaac@ornl.gov +1(865)241-3952 +1(865)574-4665

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Oak Ridge National Laboratory

Oak Ridge Tennessee 37831-6407 USA EARTH SCIENCE ATMOSPHERE ATMOSPHERIC CHEMISTRY CARBON AND HYDROCARBON COMPOUNDS EARTH SCIENCE ATMOSPHERE ATMOSPHERIC CHEMISTRY SULFUR COMPOUNDS EARTH SCIENCE ATMOSPHERE ATMOSPHERIC CHEMISTRY TRACE GASES/TRACE SPECIES EOSDIS TRANSCOM GLOBALVIEW CO2 EMISSIONS GLOBALVIEW-CO2 CARBON DIOXIDE MODEL SIMULATIONS SF6 CONCENTRATIONS SULFUR HEXAFLUORIDE SULFUR HEXAFLOURIDE FOSSIL FUEL EMISSIONS MODEL INTERCOMPARISONS CO2 INVERSION CALCULATIONS ATMOSPHERIC TRACER TRANSPORT MODELS GET DATA http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1198 VIEW RELATED INFORMATION https://daac.ornl.gov//TRANSCOM/guides/transcom3_level2.html TransCom 3: Seasonal CO2 Flux Estimates from Atmospheric Inversions (Level 2) USA/NASA ENGLISH GCMD CEOS IDN DIF VERSION 9.0