有机酸和有机胺可显著加快大气颗粒物成核速率和促进二次有机颗粒物的生长。已知有机酸和有机胺潜在来源多种多样，但缺乏系统的观测和定量分析。在不同地域其产生机制各异，因而其化学结构、反应活性也大不相同。尽管有机胺和有机酸对气溶胶大气理化过程有着重大影响，其在大气中的种类、浓度、时空分布和源谱及源分布确知之甚少。本研究将采用高分辨率飞行质谱和正/负质子交换化学电离方法，对长三角地区的有机胺和有机酸进行系统的观测。通过选择代表性的站点（如城区、郊区和工业区），进行季节性中长期观测、积累数据，并利用辅助观测资料（如臭氧、氮氧化物、一氧化碳等标准污染物和气象参数）进行统计学模式分析（PMF）以取得其化学种类、时空分布和特征区域源谱及分布。为大气化学模式模拟有机胺和有机酸化学过程和二次有机气溶胶形成提供源排放清单。

Organic acid (OA) and amine can lead to faster nucleation rate and enhance secondary organic aerosol formation. Many sources of OA and amines have been reported although systematic field observations and quantitative analyses are still limited. The chemical structure and reactivity of these OA and amines vary significantly from place to place due to various formation mechanisms. Despite the potential impacts of amines and OA on the atmospheric chemistry-related processes, little is known about their chemical speciation, ambient concentration, spatial and temporal distributions, source profiles, and source distributions. In this work, we propose to systematically conduct field measurements of amines and OA in the Yangzi River Delta area using a high-resolution time-of-flight chemical ionization mass spectrometer (HTOF-CIMS) equipped with a bipolar proton-transfer reaction ion source. By conducting seasonal, long-term field observations of OA and amines at representative locations (e.g., urban site, suburban site, and industrial site) and performing statistical analyses (e.g., Positive Matrix Factorization) with the assistance of other trace gas measurements (e.g., O3, NOx, and CO) and meteorological observations, we will identify the major amine and OA species, quantify their ambient concentrations, investigate their spatial and temporal variations, and categorize individual source profile and source distributions. The data sets obtained from this work will be used to establish OA and amine emission inventories for model simulations so that the model can accurately capture the chemical evolutions of OA and amines and SOA formations in the atmosphere.