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Title: Interpreting the variability of space-borne CO2 column-averaged volume mixing ratios over North America using a chemistry transport model
Authors: Palmer, P. I.
Barkley, M. P.
Monks, Paul Steven
First Published: 13-Oct-2008
Publisher: Copernicus Publications on behalf of the European Geosciences Union
Citation: Atmospheric Chemistry And Physics, 2008, 8 (19), pp. 5855-5868 (14)
Abstract: We use the GEOS-Chem chemistry transport model to interpret the sources and sinks of CO[Subscript: 2] that determine variability of column-averaged volume mixing ratios (CVMRs), as observed by the SCIAMACHY satellite instrument, during the 2003 North American growing season. GEOS-Chem generally reproduces the magnitude and seasonal cycle of observed CO[Subscript: 2] surface VMRs across North America and is quantitatively consistent with column VMRs in later years. However, it cannot reproduce the magnitude or variability of FSI-WFM-DOAS SCIAMACHY CVMRs. We use model tagged tracers to show that local fluxes largely determine CVMR variability over North America, with the largest individual CVMR contributions (1.1%) from the land biosphere. Fuel sources are relatively constant while biomass burning makes a significant contribution only during midsummer. We also show that non-local sources contribute significantly to total CVMRs over North America, with the boreal Asian land biosphere contributing close to 1% in midsummer at high latitudes. We used the monthly-mean Jacobian matrix for North America to illustrate that:~1) North American CVMRs represent a superposition of many weak flux signatures, but differences in flux distributions should permit independent flux estimation; and 2) the atmospheric e-folding lifetimes for many of these flux signatures are 3–4 months, beyond which time they are too well-mixed to interpret. These long lifetimes will improve the efficacy of observed CVMRs as surface CO[Subscript: 2] flux constraints.
DOI Link: 10.5194/acp-8-5855-2008
ISSN: 1680-7316
eISSN: 1680-7324
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © Author(s) 2008. This work is distributed under the Creative Commons Attribution 3.0 License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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