Instrumentation for Atmospheric Sulfur Compounds

该项目支持继续开发几种大气压电离质谱仪（APIMS），用于对一系列硫化合物（包括二甲基硫醚（DMS）及其几种氧化产物）进行空中测量。其目的是在不久的将来部署这些仪器在硫化学和气溶胶的实地研究。海洋是二甲硫醚的主要来源，二甲硫醚在大气中通过仍然知之甚少的途径被氧化。二甲基硫醚氧化的产物包括硫酸和其他低蒸汽压硫化合物，这可能导致新颗粒的形成，或现有大气气溶胶的生长和转化，包括云凝结核。这些过程的重要性在于它们在气溶胶和云的形成中的作用，而气溶胶和云又对气候产生重大的直接和间接影响。该项目将支持大气化学领域的重要基础设施，并将为一名本科生提供培训机会。

This project supports the continued development of several atmospheric pressure ionization mass spectrometers (APIMS) for airborne measurements of a suite of sulfur compounds, including dimethyl sulfide (DMS) and several of its oxidation products. The intent is to deploy these instruments in the near future in a field study of sulfur chemistry and aerosols. The oceans are the main source of DMS, which is oxidized in the atmosphere through pathways that are still poorly understood. Among the products of DMS oxidation are sulfuric acid and other low vapor pressure sulfur compounds, which can lead to the formation of new particles, or growth and transformation of existing atmospheric aerosols, including cloud condensation nuclei. The importance of these processes is in their role in aerosol and cloud formation, which in turn have significant direct and indirect impacts on climate.This project will support important infrastructure in the field of atmospheric chemistry, and will also provide a training opportunity for an undergraduate student.