CAREER: Revitalizing aerosol-cloud-chemistry research at Whiteface Mountain

职业：振兴怀特菲斯山的气溶胶云化学研究

• 批准号: 1945563
• 负责人: Sara Lance
• 金额: $ 68.37万
• 依托单位: SUNY at Albany
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-02-01 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1945563&HistoricalAwards=false
• 关键词: CAREER; Revitalizing; aerosol; cloud; chemistry

A new measurement strategy is proposed at the Whiteface Mountain (WFM) summit research observatory in New York State that will enable a more complete characterization of the chemical processes occurring within the clouds. Multiphase chemical observations have been made at WFM since the mid-1970s, when there was particular interest in the conversion of gas-phase sulfur dioxide emissions to aerosol sulfate resulting in acidic rain. Subsequent to the implementation of federal and regional air quality standards, the chemistry occurring within the clouds at this location has changed substantially. These changes suggest the emergence of a new chemical regime dominated by organics and ammonium. This project is investigating this changing chemical regime.The central hypothesis of the proposed work is that cloud processing continues to alter the chemical composition of ambient aerosols in the northeastern U.S., in ways that fundamentally differ from the dominant inorganic processes in previous decades. More specifically, cloud processing increases secondary organic aerosol mass via condensation of soluble organic gases and subsequent aqueous reactions, yielding less volatile organic compounds that remain in the condensed phase upon droplet evaporation. The proposed research will investigate the following science questions: (1) What is driving the increasing trend in water soluble organic carbon (WSOC) at WFM? (2) What happens to the excess ammonia and WSOC vapor when the cloud droplets evaporate? and (3) Will increases in excess ammonia lead to increased WSOC in the future? The proposed research will build upon past and ongoing research at WFM and lead to a better understanding of multiphase chemical processes occurring within clouds.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.

在纽约州的Whiteface Mountain（WFM）峰会研究天文台提出了一种新的测量策略，该研究将对云中发生的化学过程进行更完整的表征。自1970年代中期以来，在WFM上进行了多相化学观测，当时对气相二氧化硫排放到硫酸气溶胶的转化引起了酸雨。在实施联邦和区域空气质量标准之后，该位置云中发生的化学反应发生了很大变化。这些变化表明出现了以有机物和铵为主的新化学状态。 该项目正在调查这种变化的化学状态。拟议工作的中心假设是，云处理继续改变了美国东北部的环境气溶胶的化学成分，其与过去几十年来主要不同的无机过程的方式有所不同。更具体地说，云加工通过凝结可溶性有机气体和随后的水反应来增加次级有机气溶胶质量，从而产生挥发性较小的有机化合物，这些化合物在液滴蒸发后仍保持在冷凝相中。拟议的研究将调查以下科学问题：（1）是什么推动了WFM上水溶性有机碳（WSOC）的日益增加的趋势？ （2）当云滴蒸发时，多余的氨和WSOC蒸气会发生什么？ （3）过量氨将来会导致WSOC增加吗？ 拟议的研究将基于WFM的过去和正在进行的研究，并使人们对云中发生的多相化学过程有了更好的了解。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估评估的评估来支持的。

项目成果

Changes in Atmospheric Aqueous Chemistry at Whiteface Mountain: Shifting focus from Acid rain

白脸山大气水化学的变化：将焦点从酸雨转移

• 发表时间: 2021
• 期刊: National Acid Deposition Program (NADP
• 作者: Christopher Lawrence, Sara Lance