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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 113,
G01023,
10 PP., 2008
doi:10.1029/2007JG000435
An estimate of monthly global emissions of anthropogenic CO2: Impact on the seasonal cycle of atmospheric CO2
Computational Earth Sciences Group, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, USA
Computational Earth Sciences Group, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
Geography Department, University of Maryland, College Park, Maryland, USA
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
Computational Earth Sciences Group, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
Computational Earth Sciences Group, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
School of Engineering, Vanderbilt University, Nashville, Tennessee, USA
Laboratory for Atmospheres, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Laboratory for Atmospheres, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Monthly estimates of the global emissions of anthropogenic CO2 are presented. Approximating the seasonal CO2 emission cycle using a 2-harmonic Fourier series with coefficients as a function of latitude, the annual fluxes are decomposed into monthly flux estimates based on data for the United States and applied globally. These monthly anthropogenic CO2 flux estimates are then used to model atmospheric CO2 concentrations using meteorological fields from the NASA GEOS-4 data assimilation system. We find that the use of monthly resolved fluxes makes a significant difference in the seasonal cycle of atmospheric CO2 in and near those regions where anthropogenic CO2 is released to the atmosphere. Local variations of 2–6 ppmv CO2 in the seasonal cycle amplitude are simulated; larger variations would be expected if smaller source-receptor distances could be more precisely specified using a more refined spatial resolution. We also find that in the midlatitudes near the sources, synoptic scale atmospheric circulations are important in the winter and that boundary layer venting and diurnal rectifier effects are more important in the summer. These findings have implications for inverse-modeling efforts that attempt to estimate surface source/sink regions especially when the surface sinks are colocated with regions of strong anthropogenic CO2 emissions.
Received 27 February 2007; accepted 4 December 2007; published 15 March 2008.
Citation: (2008), An estimate of monthly global emissions of anthropogenic CO2: Impact on the seasonal cycle of atmospheric CO2, J. Geophys. Res., 113, G01023, doi:10.1029/2007JG000435.
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