Biogeochemical Cycling of Dimethylsulfide in Seawater

二甲基硫是挥发性还原硫的主要形式， 从海洋排放到大气中。 DMS的通量具有 对大气化学和可能的全球性影响 气候 控制DMS的地球化学过程 海水中的浓度很复杂，人们对此知之甚少。 DMS 由B-二甲基磺基丙酸酯降解而成 （DMSP），某些海洋浮游植物的天然产物。 然而，最近的调查表明，只有一小部分。 海水中的DMSP-硫总量的70%可能会逃逸到 气氛 本研究将探讨几个关键方面， 海水DMS循环：1）DMS的机制和速率 海水中的降解，主要集中在生物 过程，以及在较小程度上的光化学过程;以及2） 从DMSP生产DMS，并测试两种不同的 途径参与DMSP降解。

Dimethyl sulfide is the major form of volatile reduced sulfur which is emitted form the oceans to the atmosphere. The flux of DMS has an important impact on atmospheric chemistry and possibly global climate. The biogeochemical processes which control DMS concentrations in seawater are complex and poorly understood. DMS is produced from the degradation of B-dimethylsulfoniopropionate (DMSP), a natural product of certain marine phytoplankton. However, recent investigations, suggest that only a small fraction. of the total DMSP-sulfur in seawater is likely to escape to the atmosphere. This research will investigate several key aspects of the seawater DMS cycle; 1) The mechanisms and rates of DMS degradation in seawater, concentrating mainly upon biological processes, and to a lesser extent photochemical processes; and 2) The production of DMS from DMSP and testing whether two different pathways are involved in DMSP degradation.