Interactions of Mn, Fe, N and S Cycles in Suboxic/Anoxic Zones

来自特拉华大学的一名研究人员将参加两次前往黑海的邮轮，对亚氧海洋区域还原硫化合物与Mn(III，IV)和Fe(III)相反应以及化学反硝化反应(NO3-与Mn2+，NH4+与Mn3+，Mn4+)的化学计量、速率和微生物参与进行生物地球化学研究。PI还将在切萨皮克湾进行类似的实验，以评估在亚缺氧/缺氧环境中的这些反应，在这种环境中，Fe浓度与Mn值相当，因此可以与Mn/N/S的相互作用竞争。这项研究将使用可同时测量氧化还原物种的现场伏安分析仪，在黑海和切萨皮克湾的亚缺氧区和缺氧区产生高分辨率的营养物质、锰/铁和硫物种数据。此外，与华盛顿大学和斯克里普斯大学的研究人员合作，PI将通过确定硫氧化、硝化、反硝化和厌氧氨氧化细菌的分布，将化学参数的存在与现场微生物联系起来。

A researcher from the University of Delaware will participate in two cruises to the Black Sea to conduct a biogeochemical study of the stoichiometries, rates and microbial involvement for reactions of reduced sulfur compounds with Mn (III, IV) and Fe (III) phases and for chemo-denitrification reactions (NO3- with Mn2+ and NH4+ with Mn3+, Mn4+) in suboxic ocean regions. The PI also will carry out similar experiments in Chesapeake Bay to evaluate these reactions in a suboxic/anoxic environment where Fe concentrations are comparable with Mn values and thus can compete with Mn/N/S interactions. Research from this study will result in high resolution nutrient, Mn/Fe and sulfur species data in suboxic and anoxic zones of the Black Sea and Chesapeake Bay using an in-situ voltammetric analyzer that can measure the redox species simultaneously. In addition, in collaboration with researchers from the University of Washington and from Scripps, the PI will link the presence of chemical parameters to in-situ microbes by determining the distributions of sulfur oxidizing, nitrifying, denitrifying and anaerobic ammonium oxidizing bacteria.