Secondary Organic Aerosols Formed from Photoozidation of Biogenic Volatile Organic Compounds in Forests
Photooxidation products of biogenic volatile organic compounds were characterized and measured in PM2.5 (particulate matter with an aerodynamic diameter ≤ 2.5 μm aerosol samples from forests. Aerosol sampling was conducted at four sites centred in and around major research stations located in four different regions of China: Xiaoxingan Ling (boreal), Dongping National Forest Park (temperate), Dinghu Mountain (subtropical) and Wuzhi Moutain Nature Reserve (tropical) during summer periods when the meteorological conditions are believed to be favorable for photochemical processes. Thirty samples were collected; particular matter (PM), organic carbon, elemental carbon, organic compounds, inorganic ions, and trace gases were measured. Results indicate that the average concentrations of isoprene and -pinene oxidation products, sugars and sugar alcohols vary systematically along gradients of ecological succession, except malic acid which may have both biogenic and anthropogenic origins. The maximum contributions of organic components, isoprene and -pinene oxidation products, sugars, sugar alcohols, and inorganic ions, SO42-, NO3-, C2O42-, to the PM was 28％.
secondary organic aerosols photoozidation biogenic volatile organic compounds
WANG Wu ZHANG Ting
Institute of Environmental Pollution and Health Shanghai University 200072 Shanghai, China China National Research Center for Environmental Analysis and Measurements 100029 Beijing, China
国际会议
上海
英文
3802-3804
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）