ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-7507-2008 Polar organic tracers in PM<sub>2.5</sub> aerosols from forests in eastern China Wang W. 1 Wu M. H. 1 Li L. 1 Zhang T. 2 Liu X. D. 3 Feng J. L. 1 Li H. J. 1 Wang Y. J. 1 Sheng G. Y. 1 Claeys M. 4 Fu J. M. 5 Institute of Environmental Pollution and Health, Shanghai University, 200072 Shanghai, China China National Research Center for Enironmental Analysis and Measurements, 100029 Beijing, China Chinese Research Academy of Environmental Sciences, 100012 Beijing, China Department of Pharmaceutical Sciences, University of Antwerp (Campus Drie Eiken), 2610 Antwerp, Belgium Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China 16 12 2008 8 24 7507 7518 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/8/7507/2008/acp-8-7507-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/7507/2008/acp-8-7507-2008.pdf

Photooxidation products of biogenic volatile organic compounds, mainly isoprene and monoterpenes, are significant sources of atmospheric particulate matter in forested regions. The objectives of this study were to examine time series and diel variations of polar organic tracers for the photooxidation of isoprene and &alpha;-pinene to investigate whether they are linked with meteorological parameters or trace gases, and to determine their carbon contributions. In addition, the biogenic secondary organic carbon contributions from isoprene were estimated. PM<sub>2.5</sub> (particulate matter with an aerodynamic diameter &lt;2.5 &mu;m) aerosol samples were collected from forests in eastern China and compared with data from forested sites in Europe and America. Aerosol sampling was conducted at four sites located along a gradient of ecological succession in four different regions, i.e. Changbai Mountain Nature Reserve (boreal-temperate), Chongming National Forest Park (temperate), Dinghu Mountain Nature Reserve (subtropical) and Jianfengling Nature Reserve in Hainan (tropical) during summer periods when the meteorological conditions are believed to be favorable for photochemical processes. Fifty PM<sub>2.5</sub> samples were collected; eighteen organic compounds, organic carbon (OC), elemental carbon and trace gases were measured. Results indicate that the concentration trends of the secondary organic compounds reflected those of the trace gases and meteorological parameters. Very good correlations between the sum concentrations of isoprene oxidation products and atmospheric SO<sub>2</sub>, O<sub>3</sub>, NO<sub>2</sub>, NO<sub>x</sub>, as well as CO<sub>2</sub>, at the Changbai site were found. The secondary OC due to isoprene was relatively high in tropical Hainan (0.27 μgC/m<sup>3</sup>) where isoprene-emitting broadleaf species are dominant, but was comparable in boreal Changbai (0.32 &mu;gC/m<sup>3</sup>) where coniferous species are prevalent. The contribution of malic acid, which may have both biogenic and anthropogenic sources, to the OC mass was comparable at the four sites.

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