自然源二次有机气溶胶（BSOA）在全球SOA总量中占主导地位。观测和模型结果均显示人为源排放的大量有机气溶胶（OA）会促进BSOA的生成，缺乏以人为源OA作为种子的烟雾箱模拟研究，导致无法阐明这一现象的内在机制，因而无法准确定量评估。本研究面向这一问题，利用同位素示踪区分BSOA和人为源OA，通过烟雾箱模拟研究BSOA在人为源OA上的生成机制与产率。项目首先分别以一次源排放有机物（全氘代）、苯系物SOA（全氘代）和一次源排放有机气溶胶（POA）这三类人为源OA做为种子，开展自然源前体物生成SOA的烟雾箱模拟；再针对NOx和前体物浓度，研究低NOx和高NOx条件对BSOA生成的影响；在此基础上，通过森林站点的系统观测，评估实际大气中人为源排放对BSOA生成的促进作用。本研究的开展可为准确估算人为源排放对BSOA生成的影响提供重要的机制和产率参数。

Biogenic secondary organic aerosols (BSOA)are dominant in global SOA budget. Both field observation and model prediction show significant enhancement of BSOA under the increased anthropogenic OA (AOA) emission. Due to the lack of chamber experiments using AOA as seed, it is difficult to evaluate such an enhancement. In this study, we will use three types of AOA as seeds to simulate BSOA formation in our chamber, including typical POA tracers (deuterated alkanes and fatty acids), SOA from deuterated aromatics and POA from emission sources. Isotop technique will be applied to distinguish between BSOA and AOA. After obtaining the SOA yields on these AOA seeds, we will further check the influences of high NOx and low NOx on BSOA formation. Finally, field campaigns will be undertaken at a forest site to evaluate the impact of anthropogenic emission on BSOA formation in the real atmosphere. This study can provide insight into BSOA formation especially under the influence of anthropogenic emission.