Measurement of DiMethyl Sulfide (DMS) Air-Sea Exchange by Eddy Covariance

一个新开发的涡旋协方差通量系统将被用来量化二甲基硫(DMS)的通量，并阐明控制这些通量的因素。具有同位素标记标准的大气压电离质谱仪(APIMS-ILS)将在船上用于快速测量大气DMS，用于DMS通量的涡动协方差研究。将开展实验室工作，以改进错误的表征和提高仪器的灵敏度，并将升级软件，以便能够从实地仪器实时反馈。已经确定了在不同条件和不同总体目标下测量二甲基硫通量的几个船舶巡航。通过与其他邮轮参与者的合作，将提供辅助测量。该项目的目标包括研究控制DMS交换速度的因素，如地面风速、温度和生物变化；研究DMS的产生、海气交换、氧化为硫酸盐和颗粒物形成与气候强迫的关系。这一项目将促进我们对海洋气溶胶形成和海气交换的理解，从而提高我们对硫循环和气候之间的联系的理解。该项目将有助于培养一名研究生。

A newly developed eddy covariance flux system will be used to quantify fluxes of dimethyl sulfide (DMS) and elucidate the factors controlling these fluxes. An atmospheric pressure ionization mass spectrometer with an isotopically labeled standard (APIMS-ILS) will be used on ships to make fast measurements of atmospheric DMS for use in the eddy covariance studies of the flux of DMS. Laboratory work will be performed to improve characterization of the errors and improving the sensitivity of the instrument, and the software will be upgraded to allow real time feedback from the instrument in the field. Several ship cruises have been identified for measurements of DMS flux under different conditions and with differing overall objectives. Through collaborations with other cruise participants, ancillary measurements will be available. The objectives include investigating the factors controlling DMS exchange velocity, such as surface wind speed, temperature, and biological variations; and studying the relationship between DMS production, air-sea exchange, oxidation to sulfate, and particle formation to climate forcing.This project will lead to an improvement in our understanding of marine aerosol formation and air-sea gas exchange, which in turn will improve our understanding of the linkages between the sulfur cycle and climate. The project will contribute to the training of a graduate student.