Chemistry of Sulfur Dioxide and Dimethyl Sulfide in the Tropical Marine Boundary Layer

热带海洋边界层二氧化硫和二甲硫醚的化学性质

• 批准号: 0342672
• 负责人: Alan Bandy
• 金额: $ 24.86万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-02-01 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0342672&HistoricalAwards=false
• 关键词: Chemistry; Sulfur; Dioxide; Dimethyl; Sulfide

There is currently major uncertainty regarding the oxidation pathways of dimethyl sulfide (DMS) within the tropical marine boundary layer and in the relative strength of biogenic sources to the global sulfur budget. The investigators extend upon their previous work on the atmospheric chemistry of atmospheric sulfur compounds by developing state-of-the-art fast-response Atmospheric Pressure Ionization Mass Spectrometer (APIMS) instruments to experimentally determine all the terms in the chemical budgets of DMS and sulfur dioxide (SO2). Important DMS oxidative loss pathways produce dimethyl sulfoxide (DMSO) and dimethyl sulfone (DMSO2). The investigators will use APIMS technology to measure these species, modifying additional APIMS instruments to this purpose and evaluating them through laboratory studies. The measurements these instruments will ultimately provide ambient atmospheric data valuable for chemical model development and verification, as well as producing a more observationally constrained budget for climate-relevant sulfur gases in the marine boundary layer. Broader impacts of the research include new tools to characterize atmospheric sulfur cycling and through support for a postdoctoral scholar, research training experience for an early-career geoscientist. With support from this award the investigators will assemble a research team through external investigator collaborations to plan and execute a comprehensive tropical marine boundary layer sulfur biogeochemical cycling experiment to take place in the near future.

目前，关于热带海洋边界层内二甲基硫（DMS）的氧化途径以及生物源与全球硫收支的相对强度存在很大的不确定性。 研究人员通过开发最先进的快速响应大气压电离质谱仪（APIMS）仪器来扩展他们以前在大气硫化合物的大气化学方面的工作，以实验方式确定DMS和二氧化硫（SO2）化学预算中的所有条款。 重要的DMS氧化损失途径产生二甲基亚砜（DMSO）和二甲基砜（DMSO2）。 研究人员将使用APIMS技术来测量这些物种，为此目的修改额外的APIMS仪器，并通过实验室研究对其进行评估。 这些仪器的测量结果将最终为化学模型的开发和验证提供有价值的环境大气数据，并为海洋边界层中与气候相关的含硫气体提供更具观测约束力的预算。 该研究的更广泛影响包括表征大气硫循环的新工具，并通过对博士后学者的支持，为早期职业地球科学家提供研究培训经验。 在该奖项的支持下，研究人员将通过外部研究人员合作组建一个研究团队，计划并执行一项全面的热带海洋边界层硫地球化学循环实验，该实验将在不久的将来进行。