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Aerosol organic carbon to black carbon ratios: Analysis of published data and implications for climate forcing
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
Center for Climate Systems Research, Columbia University, New York, New York, USA
NASA Goddard Institute for Space Studies and Columbia University Earth Institute, New York, New York, USA
Measurements of organic carbon (OC) and black carbon (BC) concentrations over a variety of locations worldwide have been analyzed to infer the spatial distributions of the ratios of OC to BC. Since these ratios determine the relative amounts of scattering and absorption, they are often used to estimate the radiative forcing due to aerosols. An artifact in the protocol for filter measurements of OC has led to widespread overestimates of the ratio of OC to BC in atmospheric aerosols. We developed a criterion to correct for this artifact and analyze corrected OC to BC ratios. The OC to BC ratios, ranging from 1.3 to 2.4, appear relatively constant and are generally unaffected by seasonality, sources, or technology changes, at the locations considered here. The ratios compare well with emission inventories over Europe and China but are a factor of 2 lower in other regions. The reduced estimate for OC/BC in aerosols strengthens the argument that reduction of soot emissions maybe a useful approach to slow global warming.
Received 15 March 2005; accepted 12 August 2005; published 8 November 2005.
Citation: (2005), Aerosol organic carbon to black carbon ratios: Analysis of published data and implications for climate forcing, J. Geophys. Res., 110, D21205, doi:10.1029/2005JD005977.
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