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.

纽约州白脸山 (WFM) 山顶研究天文台提出了一种新的测量策略，该策略将能够更全面地描述云层中发生的化学过程。自 20 世纪 70 年代中期以来，WFM 就进行了多相化学观测，当时人们对气相二氧化硫排放物转化为气溶胶硫酸盐导致酸雨特别感兴趣。随着联邦和地区空气质量标准的实施，该位置云层中的化学物质发生了巨大变化。这些变化表明出现了以有机物和铵为主的新化学体系。 该项目正在研究这种不断变化的化学状况。拟议工作的中心假设是，云处理继续改变美国东北部环境气溶胶的化学成分，其方式与过去几十年的主要无机过程根本不同。更具体地说，云处理通过可溶性有机气体的冷凝和随后的水反应增加二次有机气溶胶质量，产生较少的挥发性有机化合物，这些化合物在液滴蒸发时保留在冷凝相中。拟议的研究将调查以下科学问题：(1) 是什么推动了 WFM 中水溶性有机碳 (WSOC) 的增长趋势？ (2) 当云滴蒸发时，多余的氨和 WSOC 蒸气会发生什么？ (3) 过量氨的增加是否会导致未来 WSOC 增加？ 拟议的研究将建立在 WFM 过去和正在进行的研究的基础上，并有助于更好地理解云中发生的多相化学过程。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查进行评估，被认为值得支持标准。

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