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

EAGER项目是一个“概念验证”项目，旨在评估一种评估大气中新粒子形成事件的新方法。 已经开发了一种方法来区分地面和高架源的超细颗粒物，通过测量尺寸分辨颗粒物的垂直通量和它们的吸水能力。研究目的是评价：（1）涡度相关测量和尺度选择及吸湿性分辨的松弛涡度累积，以及（2）涡度相关测量和尺度选择的松弛涡度累积，以及（3）涡度相关测量和尺度选择和吸湿性分辨的松弛涡度累积（Hy-RES REA）粒子的垂直通量可用于区分地面和高架新粒子形成源;以及（2）残留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，最小的检测到的颗粒直径在尺寸上大于约10 nm）相关联。在2020年5月期间，将在俄克拉荷马州的能源部南部大平原（SGP）站点的4个不同时间段内测量尺寸和吸湿性分辨的垂直湍流气溶胶通量，该站点提供了丰富的辅助数据，包括长-周日边界层动力学和气溶胶数量和吸湿性的周日剖面的术语统计。该奖项反映了NSF的法定使命，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，认为值得支持。

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.