二次有机气溶胶估算方法研究进展

我国区域复合污染日趋严重,二次有机气溶胶(SOA)是细颗粒物PM2.5的重要组成之一.本研究总结了当前国内外定量估算SOA的主要方法,包括EC示踪法、WSOC法、受体模型法、示踪物产率法、数值模拟法等.通过对各种方法的原理介绍与比较,指出1)EC示踪法、WSOC法、受体模型法简单易行,与在线连续观测数据结合可估算高时间分辨率的SOA浓度,但受限于对当地源谱和特定物种的了解;2)示踪物产率法虽分析技术难度高,但可针对不同来源的SOA估算;3)数值模拟可获得大尺度SOA的空间分布.针对国内外的最新研究成果进行简单概述,不同方法的研究表明中国二次有机气溶胶是总有机气溶胶的重要部分,人为源VOCs对二次有机气溶胶发挥着重要贡献.本文旨在为未来我国二次有机气溶胶的研究提供基础信息和研究思路.

A review of methods for quantifying secondary organic aerosol

Regional air pollution is complex and becomes increasingly important in China. Among many others, secondary organic aerosol (SOA) is one of the most important components of PM2.5. This paper discusses various methods for quantifying SOA in the atmosphere (including methods based on the EC tracer, WSOC, receptor model, the SOA tracers, and air quality model), presents the basic principle of each method and points out that 1) the EC-tracer method, the WSOC method and the receptor model method are relatively simple and convenient, but limited by the availability of local source profiles and some specific tracers; 2) the SOA-tracer method is analytically challenging but can supply source-specific SOA information; and 3) the air quality model method can provide large scale spatial distribution of SOA. This paper also summarizes the most recent results of SOA research in China and abroad and indicates that SOA is important in organic aerosol, and anthropogenic VOCs play a significant role in SOA formation in China. The primary purpose of this review is to provide basic and integrated information and suggestion for future directions of SOA study in China.