Origin of carbonaceous aerosols over the tropical Indian Ocean: Biomass burning or fossil fuels?

Details Origin of carbonaceous aerosols over the tropical Indian Ocean: Biomass burning or fossil fuels? Origin of carbonaceous aerosols over the tropical Indian Ocean: Biomass burning or fossil fuels?

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4061n&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 24, p. 4061-4064

Physics

61

Atmospheric Composition And Structure, Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Pollution-Urban And Regional

Scientific paper

We present an analysis of the carbon, potassium and sulfate content of the extensive aerosol haze layer observed over the tropical Indian Ocean during the Indian Ocean Experiment (INDOEX). The black carbon (BC) content of the haze is as high as 17% of the total fine particle mass (the sum of carbonaceous and soluble ionic aerosol components) which results in significant solar absorption. The ratio of black carbon to organic carbon (OC) (over the Arabian Sea and equatorial Indian Ocean) was a factor of 5 to 10 times larger than expected for biomass burning. This ratio was closer to values measured downwind of industrialized regions in Japan and Western Europe. These results indicate that fossil fuel combustion is the major source of carbonaceous aerosols, including black carbon during the events considered. If the data set analyzed here is representative of the entire INDOEX study then fossil fuel emissions from South Asia must have similarly contributed to aerosols over the whole study region. The INDOEX ratios are substantially different from those reported for some source regions of South Asia, thus raising the possibility that changes in composition of carbon-aceous aerosol may occur during transport.

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