EAGER: Exploring the Ground-Level and Elevated Sources of New Particle Formation Using Aerosol Size- and Hygroscopicity-Resolved Turbulent Flux Measurement Technique

EAGER：利用气溶胶尺寸和吸湿性分辨湍流测量技术探索新颗粒形成的地面和高架来源

• 批准号: 1946340
• 负责人: Nicholas Meskhidze
• 金额: $ 10万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-15 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1946340&HistoricalAwards=false
• 关键词: EAGER; Exploring; Ground; Level; Elevated

This EAGER project is a "proof of concept" effort to evaluate a new method for assessing new particle formation events in the atmosphere. A method has been developed to distinguish between ground-based and elevated sources of ultrafine particles by measuring the vertical fluxes of size-resolved particles and their ability to absorb water. Understanding new particle formation is critical to estimating ground level particle concentrations and designing effective air quality control strategies in urban areas.The objectives of the study are to evaluate if: (1) measurements of eddy covariance and size-selected and hygroscopicity-resolved relaxed eddy accumulation (Hy-RES REA) vertical fluxes of particles can be used to separate ground-level and elevated sources of new particle formation; and (2) residual layer new particle formation events can be unambiguously linked to observed Class B nucleation events (during Class B events the smallest detected particle diameters are larger than about 10 nm in size) detected at the surface. During May of 2020, measurements will be made of size- and hygroscopicity-resolved vertical turbulent aerosol fluxes during 4 different time periods over the day at the Department of Energy's Southern Great Plains (SGP) site in Oklahoma, where a wealth of ancillary data are available, including long-term statistics of the diurnal boundary layer dynamics and diurnal profiles of aerosol number and hygroscopicity.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.

这个 EAGER 项目是一项“概念验证”工作，旨在评估一种评估大气中新粒子形成事件的新方法。 已经开发出一种方法，通过测量尺寸分辨颗粒的垂直通量及其吸水能力来区分地面和高架超细颗粒源。了解新颗粒的形成对于估计地面颗粒浓度和设计城市地区有效的空气质量控制策略至关重要。该研究的目的是评估：(1) 涡流协方差的测量以及尺寸选择和吸湿性解析的松弛涡流颗粒的累积（Hy-RES REA）垂直通量可用于分离新颗粒形成的地面和高架源； (2)残余层新颗粒形成事件可以明确地与在表面检测到的观察到的B类成核事件（在B类事件期间，检测到的最小颗粒直径大于约10nm）明确相关。 2020 年 5 月，将在俄克拉荷马州能源部南部大平原 (SGP) 站点对一天中 4 个不同时间段的尺寸和吸湿性解析垂直湍流气溶胶通量进行测量，那里有大量的辅助数据可用，包括昼夜边界层动态以及气溶胶数量和吸湿性的日剖面的长期统计数据。该奖项反映了 NSF 的法定使命和通过使用基金会的智力价值和更广泛的影响审查标准进行评估，该项目被认为值得支持。