Global Impacts of Phase State on Secondary Organic Aerosol Partitioning

相态对二次有机气溶胶分配的总体影响

• 批准号: 2246502
• 负责人: Manabu Shiraiwa
• 金额: $ 57.09万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2246502&HistoricalAwards=false
• 关键词: Global; Impacts; Phase; State; Secondary

This project is focused on studying the effects of the phase state (e.g., gas-particle partitioning) of secondary organic aerosol (SOA) on atmospheric processes at regional or global scales. The parameterizations that will be developed can help to predict multiphase chemistry processes and aerosol composition and concentration. The ultimate goal of this research is to evaluate the global impacts of phase state on atmospheric aerosol processes to better predict the aerosol effects on climate, air quality and public health.Current large-scale SOA models represent aerosol physicochemical processes using highly simplified schemes with equilibrium gas-particle partitioning. This project will evaluate under which conditions and to what extent these assumptions may or may not hold in the global atmosphere. The tasks to accomplish this goal are as follows: (1) Implement a method in the GEOS-Chem model to predict glass transition temperatures and the viscosity of SOA; (2) Derive the equilibration timescales of SOA partitioning and water uptake in global atmosphere using kinetic multilayer modeling; (3) Apply a scheme of kinetic partitioning of SOA with effective mass accommodation coefficients to consider the effects of phase state; and (4) Evaluate model predictions of the SOA budget and phase state against observations.The new aerosol phase state developments will contribute to improvements of the public version of the GEOS-Chem model and will be openly available for all users.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.

该项目的重点是研究二次有机气溶胶（SOA）对区域或全球尺度大气过程的相位状态（例如气体粒子分配）的影响。将要开发的参数化可以帮助预测多相化学过程以及气溶胶组成和浓度。这项研究的最终目的是评估相位状态对大气气溶胶过程的全球影响，以更好地预测气候对气候，空气质量和公共卫生的影响。通用的大规模SOA模型代表使用具有平衡气体平衡气压分配的高度简化方案，代表气溶胶物理化学过程。该项目将评估这些假设可能会或可能不会在全球氛围中成立的条件以及在何种程度上进行评估。实现此目标的任务如下：（1）在Geos-Chem模型中实现一种方法来预测玻璃过渡温度和SOA的粘度； （2）使用动力学多层建模得出全球大气中SOA分配和吸水的平衡时间尺度； （3）应用有效的质量适应系数的SOA动力学分配方案来考虑相状的影响； and (4) Evaluate model predictions of the SOA budget and phase state against observations.The new aerosol phase state developments will contribute to improvements of the public version of the GEOS-Chem model and will be openly available for all users.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.