Secondary Organic Aerosol: A Comparison between Foggy and Nonfoggy Days

被引：140

作者：

Kaul, D. S. ^{[1
]}

Gupta, Tarun ^{[1
]}

Tripathi, S. N. ^{[1
]}

Tare, V. ^{[1
]}

Collett, J. L., Jr. ^{[2
]}

机构：

[1] Indian Inst Technol, Dept Civil Engn, Kanpur 208016, Uttar Pradesh, India

[2] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2011年 / 45卷 / 17期

关键词：

CARBONACEOUS AEROSOLS; PARTICULATE MATTER; CHEMICAL-COMPOSITION; FINE PARTICLES; URBAN; PM2.5; ACID; DEPENDENCE; COMPONENTS; CHEMISTRY;

D O I：

10.1021/es201081d

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Carbonaceous species, meteorological parameters, trace gases, and fogwater chemistry were measured during winter in the Indian city of Kanpur to study secondary organic aerosol (SOA) during foggy and clear (nonfoggy) days. Enhanced SOA production was observed during fog episodes. It is hypothesized that aqueous phase chemistry in fog drops is responsible for increasing SOA production. SOA concentrations on foggy days exceeded those on clear days at all times of day; peak foggy day SOA concentrations were observed in the evening vs peak clear day SOA concentrations which occurred in the afternoon. Changes in biomass burning emissions on foggy days were examined because of their potential to confound estimates of SOA production based on analysis of organic to elemental carbon (OC/EC) ratios. No evidence of biomass burning influence on SOA during foggy days was found. Enhanced oxidation of SO2 to sulfate during foggy days was observed, possibly causing the regional aerosol to become more acidic. No evidence was found in this study, either, for effects of temperature or relative humidity on SOA production. In addition to SOA production, fogs can also play an important role in cleaning the atmosphere of carbonaceous aerosols. Preferential scavenging of water-soluble organic carbon (WSOC) by fog droplets was observed. OC was found to be enriched in smaller droplets, limiting the rate of OC deposition by droplet sedimentation. Lower EC concentrations were observed on foggy days, despite greater stagnation and lower mixing heights, suggesting fog scavenging and removal of EC was active as well.

引用

页码：7307 / 7313

页数：7

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