Collaborative research: Linking gas phase precursors with aerosol size, number and composition in new particle formation

GSTDTAP

项目编号	1649719
	Collaborative research: Linking gas phase precursors with aerosol size, number and composition in new particle formation
	Murray Johnston
主持机构	University of Delaware
项目开始年	2017
	2017-03-15
项目结束日期	2020-02-29
资助机构	US-NSF
项目类别	Continuing grant
项目经费	166192(USD)
国家	美国
语种	英语
英文摘要	This research will improve the understanding of the formation and growth of very small particles in the atmosphere. This laboratory study will assess the effects of temperature, relative humidity, and the concentrations of gas phase species to the formation and growth rates of small particles. Graduate students will participate in the project and will be exposed to the use of state-of-the-art instrumentation in atmospheric chemistry. The research will be applicable to improving models that predict the formation of cloud condensation nuclei in the atmosphere. The project is organized around three major themes: sulfuric acid nucleation and growth, biogenic new particle formation (NPF) particularly the role of isoprene, and the role of specific oxidants in NPF. The following scientific questions will be addressed: (1) How do temperature and RH affect sulfuric acid nucleation rates, especially under conditions such as high temperature and/or RH where ambient NPF is unlikely to be observed? (2) What are the roles of amines and ammonia in particle formation and growth, particularly with regard to particle acidity? (3) How are growth rates in the 2-10 nm size range affected by the types of growth vapors present, especially condensing vs. partitioning organic species? (4) What is the role of isoprene in biogenic nucleation and growth ? does it suppress the NPF process? (5) What are the effects of photochemical and oxidation processes on biogenic NPF, especially the role of low vs. high NOx mixing ratios?
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/70893
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Murray Johnston.Collaborative research: Linking gas phase precursors with aerosol size, number and composition in new particle formation.2017.