Polar organic tracers in PM 2.5 aerosols from forests in eastern China
Polar organic tracers in PM 2.5 aerosols from forests in eastern China
复制标题
DOI：
10.5194/acp-8-7507-2008
复制
发表时间：
2008-12
影响因子：
6.3
通讯作者：
Wu Wang;M. H. Wu;Li Li-Li;T. Zhang;X. Liu;J. L. Feng;H. Li;Yangjun Wang;G. Sheng;M. Claeys;Jia-mo Fu
中科院分区：
文献类型：
--
作者：
Wu Wang;M. H. Wu;Li Li-Li;T. Zhang;X. Liu;J. L. Feng;H. Li;Yangjun Wang;G. Sheng;M. Claeys;Jia-mo Fu
生物源挥发性有机化合物的光氧化产物，主要是异戊二烯和单萜烯，是森林地区大气颗粒物的重要来源。这项研究的目的是研究用于异戊二烯和α-Pinene光氧化的极性有机示踪剂的时间序列和日变化，以调查它们是否与气象参数或痕量气体有关，并确定它们的碳贡献。此外，还估算了异戊二烯对生物源次生有机碳的贡献。采集了空气动力学直径为2.5的颗粒物样品，测定了18种有机物、有机碳(OC)、元素碳和痕量气体。结果表明，二次有机物的浓度变化趋势反映了痕量气体和气象参数的变化趋势。长白站异戊二烯氧化产物总和与大气中SO2、O3、NO2、NOx和CO2之间有很好的相关性。热带海南的异戊二烯次生有机碳含量较高(0.2 7μGC/m3)，而北部针叶树种较多的长白地区异戊二烯次生有机碳含量与热带海南相当(0.32μGC/m3)。苹果酸对有机碳质量的贡献在四个地点是相当的，它可能有生物来源和人为来源。
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 α-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 2.5 (particulate matter with an aerodynamic diameter 2.5 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 2 , O 3 , NO 2 , NO x , as well as CO 2 , at the Changbai site were found. The secondary OC due to isoprene was relatively high in tropical Hainan (0.27 μgC/m 3 ) where isoprene-emitting broadleaf species are dominant, but was comparable in boreal Changbai (0.32 μgC/m 3 ) 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.