Suppression of New Particle Formation by Isoprene in Non-Pristine Mixed Forest Environments

非原始混合森林环境中异戊二烯对新颗粒形成的抑制

• 批准号: 2107916
• 负责人: Shan-Hu Lee
• 金额: $ 59.97万
• 依托单位: University of Alabama in Huntsville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2107916&HistoricalAwards=false
• 关键词: Suppression; New; Particle; Formation; Isoprene

With support from the Environmental Chemical Sciences Program in the Division of Chemistry at NSF, Shanhu Lee and Bernhard Vogler at the University of Alabama in Huntsville (UAH) and their graduate students will conduct laboratory kinetics studies to investigate chemical mechanisms related to the suppression of new particle formation (NPF) by isoprene, a very important biogenic hydrocarbon, in the atmosphere in forested areas. NPF contributes significantly to global cloud condensation nuclei production, impacting clouds and climate. Recent laboratory studies have demonstrated that isoprene suppresses biogenic new particle formation, but these studies were mostly limited to the conditions that mimic pristine forest conditions. This study focuses on conditions that are closely relevant to the mixed deciduous forests in the United States and include both biogenic terpenes and various pollutants. The scientific findings will be incorporated into outreach programs at UAH to communicate climate and environmental issues to multiple age groups ranging from K-12 to the general public.This project will employ a dual-flow tube system known as the TANGENT (Tandem Aerosol Nucleation and Growth ENvironment Tubes) system developed by the Lee and Vogler team to conduct multi-component nucleation and growth involving terpene-produced HOMs (highly oxygenated organic molecules), sulfuric acid, ammonia, amines, and NOx. The TANGENT system will allow the team to study nucleation and the subsequent growth of new particles independently under controlled experimental conditions. Gas-phase nucleation precursors, aerosol size, and particle-phase chemical composition will be measured with a series of state-of-the art chemical and aerosol instruments. These studies are will represent one of the most comprehensive laboratory observations yet made to study the role of isoprene on nucleation vs. growth of new particles under conditions representative of non-pristine mixed deciduous forests and at a wide range of temperature and relative humidity conditions. This fundamental research is expected to provide new insight into the role of this important biogenic volatile organic compound-isoprene-upon particle formation relevant to cloud condensation and hence climate conditions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在 NSF 化学部环境化学科学项目的支持下，阿拉巴马大学亨茨维尔分校 (UAH) 的 Shanhu Lee 和 Bernhard Vogler 及其研究生将进行实验室动力学研究，以研究与抑制新的化学物质相关的化学机制。异戊二烯是一种非常重要的生物碳氢化合物，在森林地区的大气中形成颗粒（NPF）。 NPF 对全球云凝结核的产生做出了重大贡献，影响着云和气候。 最近的实验室研究表明，异戊二烯抑制生物新颗粒的形成，但这些研究大多局限于模拟原始森林条件的条件。 这项研究的重点是与美国混合落叶林密切相关的条件，包括生物萜烯和各种污染物。 这些科学发现将被纳入 UAH 的推广计划，向从 K-12 到普通公众的多个年龄段传达气候和环境问题。该项目将采用称为 TANGENT（串联气溶胶成核和生长环境管 (Growth ENvironment Tubes) 系统由 Lee 和 Vogler 团队开发，用于进行多组分成核和生长，涉及萜烯产生的 HOM（高氧化有机分子）、硫酸、氨、胺和氮氧化物。 TANGENT 系统将使团队能够在受控实验条件下独立研究成核和随后新粒子的生长。 气相成核前体、气溶胶尺寸和颗粒相化学成分将通过一系列最先进的化学和气溶胶仪器进行测量。这些研究将代表迄今为止最全面的实验室观察之一，旨在研究异戊二烯在代表非原始混合落叶林的条件下以及在广泛的温度和相对湿度条件下对新颗粒成核与生长的作用。这项基础研究预计将为这种重要的生物挥发性有机化合物异戊二烯在与云凝结和气候条件相关的颗粒形成中的作用提供新的见解。该奖项反映了 NSF 的法定使命，并通过使用评估结果被认为值得支持。基金会的智力价值和更广泛的影响审查标准。

项目成果

Synergetic Effects of Isoprene and HO x on Biogenic New Particle Formation

异戊二烯和 HO x 对生物新颗粒形成的协同作用

• DOI: 10.1029/2023gl103545
• 发表时间: 2023-07
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Tiszenkel, Lee;Lee, Shan‐Hu
• 通讯作者: Lee, Shan‐Hu

Perspective on the Recent Measurements of Reduced Nitrogen Compounds in the Atmosphere

对最近大气中还原氮化合物测量的展望

• DOI: 10.3389/fenvs.2022.868534
• 发表时间: 2022-04
• 期刊: Frontiers in Environmental Science
• 影响因子: 4.6
• 作者: Lee; S.
• 通讯作者: S.

Indoor Particulate Matters Measured in Residential Homes in the Southeastern United States: Effects of Pandemic Lockdown and Holiday Cooking

美国东南部住宅的室内颗粒物测量：流行病封锁和假日烹饪的影响

• DOI: 10.4209/aaqr.210302
• 发表时间: 2022-01
• 期刊: Aerosol and Air Quality Research
• 影响因子: 4
• 作者: Laltrello, Sierra;Amiri, Azita;Lee, Shan
• 通讯作者: Lee, Shan