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相态的影响（例如，二次有机气溶胶（SOA）的大气过程中在区域或全球尺度上的气体颗粒分配）。将开发的参数化可以帮助预测多相化学过程和气溶胶成分和浓度。本研究的最终目标是评估全球的相态对大气气溶胶过程的影响，以更好地预测气溶胶对气候，空气质量和公众健康的影响。该项目将评估在何种条件下以及在何种程度上这些假设在全球大气中可能成立或不成立。实现这一目标的主要任务是：（1）在GEOS-Chem模型中实现一种方法来预测SOA的玻璃化转变温度和粘度，（2）利用动力学多层模型推导SOA在全球大气中分配和水分吸收的平衡时间尺度，（3）应用一种考虑相态影响的SOA动力学分配方案，并考虑有效质量调节系数，（4）利用该方案计算SOA在全球大气中分配和水分吸收的平衡时间尺度。和（4）根据观测结果评估SOA预算和相态的模型预测。新的气溶胶相态开发将有助于改进GEOS-Chem模型的公共版本，并将向所有用户开放。该奖项反映了NSF的法定使命，并被认为值得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来支持。