Collaborative Research: Analyses, Measurements and Modeling in Support of the Asian Monsoon Chemical and Climate Impact Project (ACCLIP)

这项工作包括对亚洲夏季风（ASM）的化学和动力学进行飞机研究。这种大气环流发生在对流层上层和平流层下层，横跨亚洲以东的太平洋，向西至中东。大气中污染物的垂直输送对大气化学和辐射具有全球性的影响。该项目包括培养研究生和博士后科学家。该项目的四个主要目标是：(1)研究反气旋内部的ASM上升空气向全球对流层上层-平流层下层（UTLS）的输送路径；(2)通过对空气中化学成分的采样，确定其在UTLS臭氧化学中的作用，以及在活性物种和短期气候因子的再分布中的作用，以检验亚洲污染和季风强度在化学和气候中的各自作用，并了解化学和气候之间的双向耦合。不同寿命的化学示踪剂也有助于表征ASM隆升的时间尺度，这是模型难以估计的；(3)获取有关气溶胶大小、质量和化学成分的必要信息，以确定ASM的辐射影响，约束气溶胶形成模式，并将富含有机物的ASM UTLS气溶胶种群与富含硫酸盐的火山羽流和背景气溶胶种群进行对比；(4)测量与季风动力结构相关的水汽分布，以评估穿越对流层顶的输送，并确定ASM在水汽输送到平流层中的作用。该项目计划于2020年7月至8月进行，将建立和扩大几个学术机构、政府合作伙伴和国际机构之间的合作。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 effort involves an aircraft study of the chemistry and dynamics of the Asian Summer Monsoon (ASM). This atmospheric circulation takes place in the upper troposphere and lower stratosphere and spans the Pacific Ocean east of Asia westward to the Middle East. The vertical transport of pollutants within the ASM can have a global impact on atmospheric chemistry and radiation. This project includes the training of graduate students and post-doctoral scientists.The four main objectives of the project are: (1) Investigate the transport pathway of the ASM uplifted air from inside of the anticyclone to the global upper troposphere-lower stratosphere (UTLS); (2) Sample the chemical content of air processed in the ASM to ascertain its role in UTLS ozone chemistry, and in re-distributing active species and short-lived climate forcers to examine the respective roles of Asian pollution and the monsoon strength in chemistry and climate, and to understand two-way coupling between chemistry and climate. Chemical tracers of different lifetimes can also help characterize the ASM uplifting time scales, which are difficult for the models to estimate; (3) Obtain information on aerosol size, mass and chemical composition necessary for determining the radiative impact of the ASM, for constraining models of aerosol formation and for contrasting the organic-rich ASM UTLS aerosol population with that of sulfate-rich volcanic plumes and the background aerosol population; and (4) Measure the water vapor distribution associated with the monsoon dynamical structure to evaluate transport across the tropopause, and determine the role of the ASM in water vapor transport into the stratosphere.This project is scheduled to take place during July-August 2020 and will establish and expand collaborations between several academic institutions, government partners, and international institutions.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.