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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
|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.|
|Rights:||Copyright © Author(s) 2008. This work is distributed under the Creative Commons Attribution 3.0 License ( http://creativecommons.org/licenses/by/3.0/ ), 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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