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A strong pollution episode in the upper troposphere between South China andthe Philippines was observed during CARIBIC flights in April 2007. Fivepollution events were observed, where enhancements in aerosol and trace gasconcentrations including CO, CO2, CH4, non-methane hydrocarbons(NMHCs) and halocarbons were observed along the flight tracks during foursequential flights. The importance of the contribution of biomass/biofuelburning was investigated using chemical tracers, emission factor analysis,back-trajectory analysis and satellite images. The Indochinese peninsula wasidentified as the probable source region of biomass/biofuel burning.However, enhancements in the urban/industrial tracer C2Cl4 duringthe events also indicate a substantial contribution from urban anthropogenicemissions. An estimation of the contribution of fossil fuel versusbiomass/biofuel to the CO enhancement was made, indicating a biomass/biofuelburning contribution of ~54 to ~92% of the observed COenhancements. Biomass/biofuel burning was found to be the most importantsource category during the sampling period

Pollution events observed during CARIBIC flights in the upper troposphere between South China and the Philippines