Collaborative Research: Flow Reactor Simulations of the Evolution of Atmospheric Organic Aerosol

合作研究：大气有机气溶胶演化的流动反应器模拟

• 批准号: 1244918
• 负责人: Paul Davidovits
• 金额: $ 15.8万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1244918&HistoricalAwards=false
• 关键词: Collaborative; Research; Flow; Reactor; Simulations

The focus of this project is to investigate the yields of secondary organic aerosol (SOA) in an environmental chamber as a function of VOC/NOx levels and oxidant exposure. SOA formed from the OH oxidation of organic precursors happens mostly during the daytime. However, NO3 radicals are abundant at night. These elevated NO3 levels can also coincide with elevated levels of VOCs/IVOCs due to lower nighttime boundary layer heights, which may result in significant nighttime SOA formation. The chamber results will be used to model the underlying oxidation mechanisms and to relate them to atmospheric photochemical processes.This research will provide new insight into the formation of secondary organic particles in the atmosphere and the oxidative aging of these particles. The results are important for understanding how aerosols influence the cooling and heating of the atmosphere and alter climate.

本项目的重点是调查环境舱中二次有机气溶胶(SOA)的产量与VOC/NOx水平和氧化剂暴露的函数关系。有机前体的羟基氧化生成的SOA主要发生在白天。然而，3号自由基在夜间是丰富的。由于夜间边界层高度较低，这些升高的NO3水平也可能与VOCs/IVOCs水平升高相一致，这可能会导致夜间SOA的显著形成。该实验室的结果将用于模拟潜在的氧化机制，并将其与大气光化学过程联系起来。这项研究将为大气中二次有机颗粒的形成和这些颗粒的氧化老化提供新的见解。这些结果对于理解气溶胶如何影响大气的冷却和加热以及改变气候是很重要的。