CAREER: Spectroscopic Measurements of Secondary Organic Aerosol (SOA) Precursor Gases through Laboratory and Aircraft Studies

二次有机气溶胶(SOA)通过气体化合物的化学反应在大气中形成，构成有机气溶胶的很大一部分。观测到的SOA量比大气模型预测的大一到两个数量级，这引发了一些基本问题：SOA前体的来源和化学特性是什么，它们是如何形成SOA的？这些问题将通过使用首席调查员(PI)开发的仪器进行实地研究和在模拟室内进行实验室实验来解决。将建立一台机载多轴差动光学吸收光谱仪(AMAX-DOAS)，用于测量乙二醛(CHOCHO)和其他气体的柱状数据，并限制它们在边界层和自由对流层中的水平和垂直分布。一种基于LED的腔增强型DOAS(LED-CE-DOAS)将被开发用于对痕量气体的灵敏和选择性测量。该仪器将用于在实验室实验中测量Chocho，以探索其来源和光化学增强的汇反应，并研究相关前体挥发性有机化合物(例如，异戊二烯、乙炔、芳香族VOCs)形成的SOA。该项目的教育部分将包括提高数学和科学职业中代表性不足的学生的大学准备程度。两位说一口流利的西班牙语的PI和博尔德高中科学项目的主任将联手支持大学前在科学方面代表性不足的学生，届时仍然可以确定并纠正研究生学习成功所需的关键技能-或缺乏这些技能。还将建立与K-12教师的工作关系。编写的材料将在地球科学教育数字图书馆(DLESE)中编目，并提交给DLESE社区审查系统进行同行审查。

Secondary Organic Aerosol (SOA) forms in the atmosphere through chemical reactions of gaseous compounds and comprises a large fraction of the organic aerosol. Observed SOA amounts are one to two orders of magnitude larger than predicted by atmospheric models, leading to the fundamental questions: What are the sources and chemical identities of SOA precursors and how do they form SOA? These questions will be addressed through field studies with instrumentation developed by the principal investigator (PI) and laboratory experiments in simulation chambers. An Airborne Multi-Axis Differential Optical Absorption Spectrometer (AMAX-DOAS) will be built and used to measure column data for glyoxal (CHOCHO) and other gases, and to constrain their horizontal and vertical distributions in the boundary layer and the free troposphere. An LED-based Cavity Enhanced DOAS (LED-CE-DOAS) will be developed for the sensitive and selective measurement of trace gases. This instrument will be used to measure CHOCHO in laboratory experiments to explore its sources and photochemically-enhanced sink reactions, and to study SOA formation from relevant precursor volatile organic compounds (VOCs) (e.g., isoprene, acetylene, aromatic VOCs).The project's educational component will consist of enhancing the college readiness of students underrepresented in math and science-based careers. Two fluent Spanish speakers, the PI, and the director of the Science Program at Boulder High School will team up to support students underrepresented in science prior to college, when critical skills needed to succeed in graduate studies - or the lack thereof - can still be identified and corrected. Working relationships with K-12 teachers will also be established. The materials developed will be catalogued in the Digital Library for Earth Science Education (DLESE) and submitted for peer review to the DLESE Community Review System.