Marine Biogeochemistry of Dissolved DMSP and its Sulfur Containing Degradation Products

溶解DMSP及其含硫降解产物的海洋生物地球化学

• 批准号: 9530378
• 负责人: Ronald Kiene
• 金额: $ 30.87万
• 依托单位: University of South Alabama
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-04-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9530378&HistoricalAwards=false
• 关键词: Marine; Biogeochemistry; Dissolved; DMSP; its

9530378 Kiene This three year study will increase our fundamental understanding of the role played by dissolved DMSP in the biogeochemistry of reduced sulfur in surface seawater. The specific objectives of the project are 1) to test whether the dissolved DMSP pool measured by conventional filtration techniques is truly dissolved; 2) to measure the kinetics of uptake for dissolved DMSP by natural microbial assemblages using 14C and 35S DMSP and to determine in situ turnover rates for DMSP (d); 3) to measure the sulfur products formed during DMSP degradation and to determine how the branching ratio between the lyase (DMS forming) and demethylation (methanethiol forming) pathways vary in different waters; 4) to determine mechanisms of methanethiol production in aerobic seawater and finally, to determine the loss kinetics of MeSH in seawater and the factors which affect these. The work will be carried out using primarily coastal and shelf water samples from the Northern Gulf of Mexico, but 2 oceanographic cruises are planned to provide complementary information from warm oligotrophic and cool mesotrophic ocean waters. The resulting data should greatly advance our knowledge of how DMSP is processed in the sea and how it impacts the chemistry of surface waters through production of important reduced sulfur compounds like DMS and methanethiol.

小行星9530378 这项为期三年的研究将增加我们对溶解的DMSP在表层海水中还原硫的生物地球化学中所起作用的基本理解。该项目的具体目标是：1）测试通过常规过滤技术测量的溶解的DMSP池是否真正溶解; 2）使用14 C和35 S DMSP测量天然微生物组合对溶解的DMSP的吸收动力学，并确定DMSP的原位周转率（d）; 3）测量DMSP降解过程中形成的硫产物，并确定裂解酶之间的分支比如何变化，（DMS形成）和去甲基化不同沃茨中甲烷生成途径不同;（4）确定好氧海水中甲硫醇的产生机理，并确定其在海水中的损失动力学及其影响因素。这项工作将主要利用墨西哥湾北方沿海和大陆架水样本进行，但计划进行两次海洋学考察，以提供温暖贫营养和凉爽中营养海洋沃茨的补充信息。由此产生的数据应大大推进我们的知识，DMSP是如何在海洋中处理，以及它如何影响表面沃茨的化学通过生产重要的还原硫化合物，如二甲基硫和甲硫醇。