Discrepant Ca and Alkalinity Distributions in the Oceans - Its Relevance to Deep Ocean Chemistry and a Test of the Hydrothermal Hypothesis

海洋中不同的钙和碱度分布 - 与深海化学的相关性和热液假说的检验

• 批准号: 9529749
• 负责人: Bruce Nelson
• 金额: $ 17.66万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-12-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529749&HistoricalAwards=false
• 关键词: Discrepant; Ca; Alkalinity; Distributions; Oceans

9529749 Nelson The chemistry of calcium and the carbon dioxide-carbonate system of the world ocean are intimately related by processes of production and dissolution of calcium carbonate. The calcium carbonate- carbon dioxide system is in fact one of the major geochemical features of the marine environment. Recent data strongly suggest that variations in calcium concentrations in the ocean are not quite equal to those one would expect based on the corresponding variations in alkalinity. This means that there is something about this major marine geochemical system that we do not understand. In this project, scientists at the University of Washington will carry out a detailed study of calcium and alkalinity variations in the oceanic water column with two ends in mind. First they will characterize the calcium-alkalinity discrepancy on a global basis by surveying waters of the Northwest Pacific, Northeast Pacific, Southeast Pacific, and the North Indian Ocean. Secondly, they will also make high-precision measurements of magnesium and lithium concentrations and lithium isotope distributions on a global scale to test the hypothesis that the Ca- alkalinity discrepancy can be explained by hydrothermal input of ocean ridges.

9529749纳尔逊钙的化学和世界海洋的二氧化碳-碳酸盐体系与碳酸钙的生产和溶解过程密切相关。碳酸钙-二氧化碳体系实际上是海洋环境的主要地球化学特征之一。最近的数据有力地表明，海洋中钙浓度的变化并不完全等同于人们根据相应的碱度变化而预期的结果。这意味着，关于这个主要的海洋地球化学系统，有一些我们不了解的东西。在这个项目中，华盛顿大学的科学家将在考虑到两端的情况下，对海洋水柱中的钙和碱度变化进行详细的研究。首先，他们将通过调查西北太平洋、东北太平洋、东南太平洋和北印度洋的水域来表征全球范围内的钙碱度差异。其次，他们还将对全球范围内的镁、锂浓度和锂同位素分布进行高精度测量，以验证可以用洋脊的热液输入解释钙碱度差异的假设。