Stable Isotopic Constraints on Benthic Carbonate Dissolution

该项目将确定浓度和碳同位素 深海溶解无机碳（DIC）的组成（d13 C） 孔隙水，以提供一个直接衡量的比例， 沉积物中有机碳氧化为CaCO3溶解。 这些数据将被用来检验假设， 物质氧化驱动沉积物中CaCO3溶解， 相对于方解石过饱和的底层水。 这些研究将在两个单独供资的航行中进行 重点是海底碳循环。 这一协作 努力将使现有的孔隙水d13 C数据的限制 与此同时，d13C的结果将使 为这些研究做出了宝贵贡献，提供了独立的 底栖CaCO 3的速率和垂直分布估计 解散

This project will determine the concentration and carbon isotopic composition (d13C) of dissolved inorganic carbon (DIC) in deep-sea pore water, in order to provide a direct measure of the ratio of organic carbon oxidation to CaCO3 dissolution in the sediments. These data will be used to test the hypothesis that benthic organic matter oxidation drives CaCO3 dissolution in sediments overlain by bottom water which is supersaturated with respect to calcite. These study will be carried out in two separately-funded cruises which are focused on the benthic carbon cycle. This collaborative effort will enable limitations in the existing pore water d13C data to be overcome; at the same time, the d13C results will make a valuable contribution to these studies, by providing independent estimates of the rate and vertical distribution of benthic CaCO3 dissolution.