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

合作研究：将气相前体与新颗粒形成中的气溶胶尺寸、数量和成分联系起来

• 批准号: 1649719
• 负责人: Murray Johnston
• 金额: $ 44.27万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-15 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1649719&HistoricalAwards=false
• 关键词: Collaborative; research; Linking; gas; phase

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?

这项研究将提高对大气中非常小的颗粒的形成和增长的理解。 本实验室研究将评估温度、相对湿度和气相物质浓度对小颗粒形成和生长速率的影响。研究生将参加该项目，并将接触到使用最先进的仪器在大气化学。 该研究将适用于改进预测大气中云凝结核形成的模型。该项目围绕三个主要主题组织：硫酸成核和生长，生物新粒子形成（NPF），特别是异戊二烯的作用，以及特定氧化剂在NPF中的作用。 将解决以下科学问题：（1）温度和RH如何影响硫酸成核速率，特别是在高温和/或RH等环境NPF不太可能观察到的条件下？(2)胺和氨在颗粒形成和生长中的作用是什么，特别是在颗粒酸性方面？(3)2-10 nm尺寸范围内的生长速率如何受到存在的生长蒸汽类型的影响，特别是冷凝与分配有机物质？(4)异戊二烯在生物成核和生长中的作用是什么？它会抑制NPF过程吗(5)光化学和氧化过程对生物NPF的影响是什么，特别是低与高NOx混合比的作用？

项目成果

Growth of Aitken mode ammonium sulfate particles by α-pinene ozonolysis

α-蒎烯臭氧分解法生长艾特肯模式硫酸铵颗粒

• DOI: 10.1080/02786826.2019.1568381
• 发表时间: 2019
• 期刊: Aerosol Science and Technology
• 影响因子: 5.2
• 作者: Krasnomowitz, Justin M.;Apsokardu, Michael J.;Stangl, Christopher M.;Tiszenkel, Lee;Ouyang, Qi;Lee, Shanhu;Johnston, Murray V.
• 通讯作者: Johnston, Murray V.

Nanoparticle growth by particle-phase chemistry

• DOI: 10.5194/acp-18-1895-2018
• 发表时间: 2018-02-09
• 期刊: ATMOSPHERIC CHEMISTRY AND PHYSICS
• 影响因子: 6.3
• 作者: Apsokardu, Michael J.;Johnston, Murray V.
• 通讯作者: Johnston, Murray V.

Molecular Characterization of Atmospheric Organic Aerosol by Mass Spectrometry

• DOI: 10.1146/annurev-anchem-061516-045135
• 发表时间: 2019-01-01
• 期刊: ANNUAL REVIEW OF ANALYTICAL CHEMISTRY, VOL 12
• 作者: Johnston, Murray V.;Kerecman, Devan E.
• 通讯作者: Kerecman, Devan E.

Sulfur Dioxide Modifies Aerosol Particle Formation and Growth by Ozonolysis of Monoterpenes and Isoprene

• DOI: 10.1029/2018jd030064
• 发表时间: 2019-04
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: C. Stangl;J. Krasnomowitz;Michael J. Apsokardu;L. Tiszenkel;Ouyang Qi;Shan-Yuan Lee;M. Johnston

Temperature effects on sulfuric acid aerosol nucleation and growth: initial results from the TANGENT study

• DOI: 10.5194/acp-19-8915-2019
• 发表时间: 2019-07
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: L. Tiszenkel;C. Stangl;J. Krasnomowitz;Q. Ouyang;Huan Yu;Michael J. Apsokardu;M. Johnston;Shan‐Hu Lee