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

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