Diffusion Coefficients of Dissolved Carbonate Species and CaCO 3 Dissolution in Deep-Sea Sediments

研究正在进行中，以研究碳酸钙的溶解 海底的微粒。 实验室扩散池研究 的有效扩散系数， 溶解的碳酸盐物质沉积。 这项工作将有助于 为了确定溶解速率是否受到扩散性的限制， 海水和孔隙沃茨之间的交换或通过反应动力学。 现场实验旨在确定回收率的 底栖有机碳和碳酸钙碳 赤道大西洋西部的方解石饱和层 海洋 研究的主要目标是确定 有机物的氧化促进溶解的程度 表层沉积物中的物质。 原位高分辨率孔隙 pH值和pCO2的水剖面将使用新完善的 微电极技术 实地工作计划于 塞阿拉海隆面积与海底室流量 测量R。Jaknke和现场整体岩心挤压机 方法由马丁和塞尔斯。 初步测试和 美国东南部正在进行各种方法的相互比较。 大陆边缘

Research is underway to study the dissolution of calcium carbonate particles on the ocean floor. The laboratory diffusion-cell study is designed to determine the effective diffusion coefficients of the dissolved carbonate species sediments. This effort will help to determine whether the dissolution rates are limited by diffusive exchange between seawater and pore waters or by reaction kinetics. The field experiment is designed to determine rates of recycling of benthic organic carbon and calcium carbonate carbon above and below the calcite saturation horizon in the western equatorial Atlantic Ocean. A primary goal of the research is to determine to what extent the dissolution is enhanced by the oxidation of organic matter within surface sediments. In situ high resolution pore water profiles of pH and pCO2 will be made using newly perfected microelectrode techniques. The field work is planned for the Ceara Rise area in conjunction with benthic chamber flux measurements by R. Jaknke and with in situ whole core squeezer methods by Martin and Sayles. Preliminary testing and intercomparison of methods is being done in the southeastern U.S. continental margin.