ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-1649-2010 Pollution events observed during CARIBIC flights in the upper troposphere between South China and the Philippines Lai S. C. 1 Baker A. K. 1 Schuck T. J. 1 van Velthoven P. 2 Oram D. E. 3 Zahn A. 4 Hermann M. 5 Weigelt A. 5 Slemr F. 1 Brenninkmeijer C. A. M. 1 Ziereis H. 6 Max Planck Institute for Chemistry, Air Chemistry Division, J.-J.-Becherweg 27, 55128, Mainz, Germany Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE, de Bilt, The Netherlands National Centre for Atmospheric Science, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK Institut für Meteorologie und Klimaforschung (IMK), Forschungszentrum Karlsruhe, Weberstr. 5, 76133 Karlsruhe, Germany Leibniz-Institut für Troposphärenforschung (IFT), Permoserstr. 15, 04318 Leipzig, Germany Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, 82230 Wessling, Germany 15 02 2010 10 4 1649 1660 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/1649/2010/acp-10-1649-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/1649/2010/acp-10-1649-2010.pdf

A strong pollution episode in the upper troposphere between South China and the Philippines was observed during CARIBIC flights in April 2007. Five pollution events were observed, where enhancements in aerosol and trace gas concentrations including CO, CO<sub>2</sub>, CH<sub>4</sub>, non-methane hydrocarbons (NMHCs) and halocarbons were observed along the flight tracks during four sequential flights. The importance of the contribution of biomass/biofuel burning was investigated using chemical tracers, emission factor analysis, back-trajectory analysis and satellite images. The Indochinese peninsula was identified as the probable source region of biomass/biofuel burning. However, enhancements in the urban/industrial tracer C<sub>2</sub>Cl<sub>4</sub> during the events also indicate a substantial contribution from urban anthropogenic emissions. An estimation of the contribution of fossil fuel versus biomass/biofuel to the CO enhancement was made, indicating a biomass/biofuel burning contribution of ~54 to ~92% of the observed CO enhancements. Biomass/biofuel burning was found to be the most important source category during the sampling period.

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