Complete Isotopic Analysis of Aerosol Sulfate and Nitrate in Long-Term Samplings from the Tropical Atlantic

热带大西洋长期采样中气溶胶硫酸盐和硝酸盐的完整同位素分析

• 批准号: 0431483
• 负责人: Mark Thiemens
• 金额: $ 41.59万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0431483&HistoricalAwards=false
• 关键词: Complete; Isotopic; Analysis; Aerosol; Sulfate

This project investigates the impacts of anthropogenic activities on tropospheric sulfur and nitrogen cycling in the atmosphere. Existing daily aerosol samples acquired by University of Miami (UM) during a several decade long program will be used to study the mass-independent (oxygen, nitrogen and sulfur) isotope effects in sulfates and nitrates occurring in these samples. Specifically, the Mass Independent Fractionation (MIF) of 17O in sulfate and nitrate components of selected aerosol samples, as well as more traditional sulfur and nitrogen isotope analyses will be used to characterize atmospheric oxidative processes with a view to identifying unique reaction pathways occurring in the ambient environment downwind of anthropogenic and natural sources of sulfate and nitrate precursors. Results from this study will further understanding of aerosol formation and atmospheric transport, particularly with respect to elucidating long term changes in aerosol source signatures and production pathways and the potential of these to impact climate. Support is included for a postdoctoral researcher and one graduate student to gain research experience under the mentorship of the principal investigator.

该项目研究人类活动对大气中对流层硫和氮循环的影响。 迈阿密大学 (UM) 在长达数十年的计划中获取的现有日常气溶胶样本将用于研究这些样本中硫酸盐和硝酸盐中与质量无关的（氧、氮和硫）同位素效应。 具体而言，选定气溶胶样品中硫酸盐和硝酸盐成分中 17O 的质量独立分馏 (MIF) 以及更传统的硫和氮同位素分析将用于表征大气氧化过程，以识别发生在气溶胶中的独特反应途径。硫酸盐和硝酸盐前体的人为和天然来源的下风向周围环境。 这项研究的结果将进一步了解气溶胶的形成和大气输送，特别是阐明气溶胶来源特征和产生途径的长期变化及其影响气候的潜力。 支持一名博士后研究员和一名研究生在首席研究员的指导下获得研究经验。