Quantifying the Effect of Vapor Wall Deposition on Chamber-Derived Yields of Secondary Organic Aerosol

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项目编号	1523500
	Quantifying the Effect of Vapor Wall Deposition on Chamber-Derived Yields of Secondary Organic Aerosol
	John Seinfeld
主持机构	California Institute of Technology
项目开始年	2015
	2015-07-15
项目结束日期	2018-06-30
资助机构	US-NSF
项目类别	Standard Grant
项目经费	524889(USD)
国家	美国
语种	英语
英文摘要	This research is focused on the study of secondary organic aerosol (SOA), very small particles condensed from the gas phase, in environmental chambers and the effects of gas and particle deposition onto the chamber walls. Modeling studies generally utilize fundamental data from environmental chambers in predicting ambient aerosol concentrations in the atmosphere. Currently a discrepancy exists between model predictions and atmospheric measurements of SOA. The reanalysis of historical chamber experiments indicates that prior reported SOA yields may have been underpredicted. The information from this research is critical for understanding aerosol-induced health effects and contributions to global aerosol radiative forcing. The proposed work includes: (1) Measurements of the wall deposition rates of individual organic species on the Teflon walls of a chamber and correlation of those rates to molecular properties of the species; (2) Chamber experiments with a wide range of important biogenic and anthropogenic volatile organic compounds in which the competition between vapor transport to particles and the walls is modulated; and (3) Development of a comprehensive model of chamber vapor dynamics that allows quantitative assessment from data on individual species of the impact of vapor wall deposition and extrapolation to atmospheric "wall-less" conditions.
来源学科分类	Geosciences - Atmospheric and Geospace Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/68292
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	John Seinfeld.Quantifying the Effect of Vapor Wall Deposition on Chamber-Derived Yields of Secondary Organic Aerosol.2015.