Cooperative Studies of Southern Ocean Biogeochemistry

拟议的工作将获得一个广泛的海洋数据集，该数据集将确定南大洋大部分地区混合层深度的净产量、总产量、铁的充分性、营养物质浓度和辐照度。研究结果将用于研究净生产量和总生产量之间的关系以及影响这些变量的因素，并将对南大洋真光层带营养物质和碳浓度的演变、高营养低叶绿素水体的生物地球化学、南大洋生物化学过程对大气二氧化碳的影响以及全球海洋的肥力产生影响。观测到的数据集将包括溶解氧/Ar比率和氧的三重同位素组成，前者是生物氧过饱和度的量度，后者是光合作用产生的溶解氧池的分数。地表水样本将在古尔德号和机遇号船上采集，并在本国机构进行分析。这项工作将在与研究南大洋生物地球化学的其他独立和已建立的国际项目的合作研究中开展。其中包括一个在霍巴特以南的Astrolabe上工作的法国-澳大利亚小组，一个在西太平洋南极光上工作的澳大利亚小组，以及一个在德雷克海峡和南奥克尼群岛上Irizar工作的阿根廷小组。

The proposed work will obtain an extensive oceanic data set that will define net production, gross production, iron sufficiency, nutrient concentrations, and irradiance at mixed layer depths over a large part of the Southern Ocean. The results will be used to investigate the relationship between net and gross production and factors influencing these variables, and will have implications for the evolution of the nutrient and carbon concentrations in the Southern Ocean euphotic zone, the biogeochemistry of high nutrient-low chlorophyll water bodies, the influence of Southern Ocean biochemical processes on atmospheric carbon dioxide, and the fertility of the global oceans. The observed data set will consist of the dissolved oxygen/argon ratio, a measure of biological oxygen supersaturation, and the triple isotope composition of oxygen, a measure of the fraction of the dissolved oxygen pool derived from photosynthesis. Surface water samples will be collected on the L.M. Gould and on ships of opportunity, and analyzed at the home institution. The work will be carried out in collaborative studies with other independent and established international projects studying Southern Ocean biogeochemistry. These include a French-Australian group working south of Hobart on Astrolabe, an Australian group working in the western Pacific on Aurora Australis, and an Argentine group working between the Drake Passage and South Orkney Islands on Irizar.