Integrating Observational Constraints and Modeling of Atmospheric Reactive Organic Carbon

该项目旨在改进大气中活性有机碳的建模。活性有机碳在控制对流层的整体组成中起着核心作用。有机碳的氧化最终导致有机气溶胶、臭氧和二氧化碳的形成，因此对了解空气污染的形成和气候变化的原因至关重要。本研究旨在提高对反应性有机碳在对流层化学中的作用的认识，并为GEOS-Chem模型提供重大改进，从而为有关空气质量和气候的政策决策提供更准确的信息。本项目的两个首要目标是评估观察和模型中影响活性有机碳（ROC）质量和反应性的关键因素，并改进ROC的模型描述，并根据观察结果进行测试。该项目将综合过去和正在进行的现场测量，以探索新的概念，并作为测试模型方案的手段。修订后的研究计划包括以下任务：(1)在美国最近两次实地活动中观察到的ROC质量浓度和OH反应性的观测特征和对比；(2)改进ROC处理的全球模型描述，重点关注有机气溶胶的光化学损失；(3)改进ROC化学的全局模型描述，重点关注单萜氧化化学；(4)评估全球模型所代表的OH和NO3反应性特征；(5)使用齐柏林测量来检验欧洲地区ROC和OH反应性的模型表征。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project is designed to improve the modeling of reactive organic carbon in the atmosphere. Reactive organic carbon species play a central role in controlling the overall composition of the troposphere. The oxidation of organic carbon ultimately leads to the formation of organic aerosol, ozone, and carbon dioxide, and is therefore of critical importance to understanding the formation of air pollution and the causes of climate change. This research is designed to improve the understanding of the role of reactive organic carbon in tropospheric chemistry, and to provide significant improvements to the GEOS-Chem model, leading to more accurate information for policy decisions regarding air quality and climate. The two overarching goals for this project are to assess the key contributors to reactive organic carbon (ROC) mass and reactivity in both observations and models, and to improve model descriptions of ROC and test these against observations. This project will synthesize past and on-going field measurements to explore new concepts and as a means of testing model schemes.The revised research plan includes the following tasks: (1) Observationally characterize and contrast the ROC mass concentrations and OH reactivity observed during two recent field campaigns in the United States; (2) Improve a global model description of ROC processing, with a focus on photochemical loss of organic aerosol; (3) Improve a global model description of ROC chemistry, with a focus on monoterpene oxidation chemistry; (4) Assess the characteristics of OH and NO3 reactivity as represented by a global model; and (5) Use Zeppelin measurements to test the model representation of ROC and OH reactivity over Europe.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.