U.S.-Australia Cooperative Research: Biogeochemical Processes in the Subantarctic Zone

小行星9724919 南大洋亚南极带在过去和现在的全球气候变化中发挥着关键作用，因此引起了国际科学界的极大兴趣。该提案寻求资金，以支持与澳大利亚海洋科学家的独特合作，调查这一海洋区域的生物地球化学循环。 主要研究者是查尔斯顿大学地质系的贾科莫·迪·图里奥教授，他的同行是彼得·N.塔斯马尼亚大学南极和南大洋环境合作研究中心的Sedwick将对整个微生物群落的生理状态和对铁和主要营养素生长限制的反应进行跨学科研究。实验将研究的可能性，铁可能会控制硅：氮利用率的bioblasts（包括物种优势的影响），异养/自养竞争铁，铁和主要营养物质的影响，生产的辐射重要的气体二甲基硫醚（DMS）及其前体DMSP。澳大利亚船舶RSV Aurora Australis上的实地方案和研究巡航将涉及澳大利亚，新西兰和法国的研究人员以及该项目支持的美国研究人员。 结果将有助于我们了解影响全球碳循环的因素，并将进一步交流思想，鼓励美国，新西兰，法国和澳大利亚的海洋科学界之间的合作。

9724919 DiTullio The Subantarctic Zone of the Southern Ocean plays a critical role in both past and present global climate change, and is therefore of considerable interest to the international science community. This proposal seeks funds to support a unique collaboration with Australian marine scientists to investigate biogeochemical cycling in this oceanic region. The prinicipal investigator, Professor Giacomo Di Tullio, of the Department of Geology, University of Charleston, and his counterpart, Dr. Peter N. Sedwick, of the Cooperative Research Center for the Antarctic and Southern Ocean Environment, University of Tasmania, will conduct and interdisciplinary study of the physiological status and response of the whole microbial community to growth limitation by iron and major nutrients. Experiments will examine the possibility that iron may control Si:N utilization ratios by the biotas (including implications for species dominance), heterotrophic/autotrophic competition for iron, and iron and major nutrient effects on production of the radiatively important gas dimethylsulfide (DMS) and its precursor DMSP. The field program and research cruise on the Australian vessel RSV Aurora Australis will involve Australian, New Zealand, and French researchers as well as the American researchers supported under this project. Results will contribute to our understanding of factors affecting global carbon cycling, and will further the exchange of ideas and encourage cooperation between the marine science communities of the United States, New Zealand, France, and Australia.