基于外场观测的大气二次有机气溶胶研究

被引:16
作者
郭松 [1 ,2 ]
胡敏 [1 ,2 ]
尚冬杰 [1 ,2 ]
郭庆丰 [1 ,2 ]
胡伟伟 [1 ,2 ]
机构
[1] 北京大学环境模拟与污染控制国家重点实验室
[2] 北京大学环境科学与工程学院
关键词
有机气溶胶; 二次有机气溶胶; 二次有机碳; 外场观测;
D O I
暂无
中图分类号
O648.18 [气溶胶(烟、雾)];
学科分类号
070304 ; 081704 ;
摘要
二次有机气溶胶(SOA)是指挥发性有机物在大气中发生光化学氧化进入到颗粒相的产物,由于其具有强烈的环境效应、气候效应和人体健康效应,因此成为大气化学研究的热点.然而由于SOA的复杂性和测量技术的限制,目前对SOA的研究还非常有限.总体来说,对SOA的研究手段主要有三种方法:实验室模拟、模式模拟和基于外场观测的SOA研究.由于SOA的研究非常广泛,本文仅综述了基于外场观测的SOA组成、来源和生成机制的研究,重点在于SOA组分的测量和总量的估算.基于外场观测的SOA研究是随着技术的发展而发展的,早期的研究仅仅能对SOA的少数物种进行测量,主要是一些有机酸和多羟基化合物;也有利用一些假设对SOA进行粗略的估算,如受体模型法、非生物质燃烧水溶性有机物法;随着SOA实验室模拟研究和示踪物测量技术的发展,二次有机示踪物法真正做到了对特定前体物VOC生成SOA的估算;随着在线测量技术的提高,EC示踪/CO示踪和OC/EC比值法和基于气溶胶质谱(AMS)-正交矩阵模型(PMF)的方法被广泛应用于SOA的估算.尤其是AMS-PMF联用方法的出现为SOA来源和生成机制的研究开拓了新的方向.对AMS技术和示踪物技术的进一步联合和开发有望成为未来SOA研究重要的方向.
引用
收藏
页码:145 / 157
页数:13
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