临安秋季近地层非甲烷碳氢化合物特征

Characteristics of Non-Methane Hydrocarbons Collected in Lin’an, a Rural/Agriculture Site of Eastern China during 1999 Autumn

应用浙江临安1999年秋季非甲烷碳氢化合物(NMHC)观测数据,分析了NMHC特征,并估计其对该地O3的影响。该地NMHC芳香烃含量最高为47.9%,其次为:烷烃29.1%,烯烃12.7%,炔烃8.2%,生物排放的烃2.1%。从各NMHC成份相关分析发现,NMHC主要排放源是该地生物物质(柴草、秸秆、农业废弃物)焚烧,存在未知芳香烃人为源的可能。丙烯等量浓度分析表明,芳香烃、CO、生物源烃和烯烃对该地O3均有重要贡献。观测和模式分析显示本次观测的O3处于NMHC控制区。

In context of data collected at Lin'an station, a rural/agriculture site of eastern China during October/early November 1999, we analyse the non-methane hydrocarbons (NMHCs) characteristics and estimate their effects on photochemical ozone. The results show that aromatics is the largest part of NMHCs by carbon atom concentration, account for 47.9%, followed by alkane 29.1%, alkene 12.7%, alkyne 8.2%, and biogenic hydrocarbons are least, 2.1%. The better correlations within majority of NMHCs, CH_(3)Cl and CO imply that the most important source of NMHCs is biomass (wood, grass,crop residues, etc.) burning. However, there are potential uncertain sources of aromatics. Propylene-equivalent concentration method indicates that aromatics, CO, biogenic hydrocarbons and alkene are the dominative contributors to photochemical ozone. The sensitive experiments by a photochemical box model reveal that Lin'an photochemical ozone is under NMHCs-sensitive condition.