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

目前，在热带海洋边界层内二甲基硫化物(DMS)的氧化途径以及生物来源相对于全球硫收支的相对强度方面存在重大不确定性。研究人员通过开发最先进的快速响应大气压力电离质谱仪(APIMS)仪器，在实验上确定DMS和二氧化硫(SO2)化学预算中的所有项，从而扩展了他们之前在大气硫化物大气化学方面的工作。二甲基亚砜(DMSO)和二甲基亚砜(DMSO2)是二甲基亚砜氧化损失的重要途径。调查人员将使用APIMS技术来测量这些物种，为此目的改装更多的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最终将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有关的硫磺气体产生更受观测限制的预算。这项研究的更广泛影响包括新的工具来描述大气中硫循环的特征，以及通过支持博士后学者、研究人员和研究人员，以及为职业生涯早期的地球科学家提供培训经验。在该奖项的支持下，研究人员将通过外部研究人员的合作组建一个研究小组，以计划和执行在不久的将来进行的全面的热带海洋边界层硫生物地球化学循环实验。

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.