Biogeochemical Cycling of Dimethylsulfide in Seawater

海水中二甲硫醚的生物地球化学循环

• 批准号: 9203728
• 负责人: Ronald Kiene
• 金额: $ 9.8万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1993-01-07
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9203728&HistoricalAwards=false
• 关键词: Biogeochemical; Cycling; Dimethylsulfide; Seawater

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.

二甲基硫化物是挥发性还原硫的主要形式，从海洋排放到大气中。二甲基硫的通量对大气化学乃至全球气候都有重要影响。控制海水中DMS浓度的生物地球化学过程是复杂的，人们对此知之甚少。DMS是由某些海洋浮游植物的天然产物--B-二甲基磺酸丙酸酯(DMSP)降解而成。然而，最近的调查表明，只有一小部分。在总DMSP中，海水中的硫可能会逃逸到大气中。这项研究将研究海水DMS循环的几个关键方面：1)DMS在海水中的降解机制和速率，主要集中在生物过程，其次是光化学过程；2)从DMSP产生DMS，并测试是否有两种不同的途径参与DMSP的降解。