Changes in Surface Morphology of Calcite Exposed to the Oceanic Water Column
Changes in Surface Morphology of Calcite Exposed to the Oceanic Water Column
复制标题
暴露于海洋水柱中的方解石表面形态的变化
DOI：
10.1023/a:1009652821575
复制
发表时间：
1997
影响因子：
1.6
通讯作者：
F. Mackenzie
中科院分区：
文献类型：
--
作者：
P. J. Troy;Yuan;F. Mackenzie
生物成因碳酸盐矿物表面发生的反应对碳的地球化学循环有重要影响。在这项研究中，碳酸盐矿物与环境海水的表面反应进行了研究，原子力显微镜（AFM）。在北太平洋亚热带沃茨，方解石表面被悬挂在沉积物捕集器阵列线上的离散深度处，为期三天的部署期。在纳米分辨率的表面形态的变化进行了检查，并作为一个约束条件，在这些沃茨的方解石饱和度的深度分布进行评价。证据表明：（1）在暴露于浅海的碳酸盐表面上形成的有机膜可能是上层海洋水柱过饱和状态的原因;（2）在海洋浅暖层中碳酸盐矿物的溶解可能是北太平洋碱度异常的部分原因。
Reactions occurring on the surfaces of biogenic carbonate minerals can have important consequences for the biogeochemical cycle of carbon. In this study, carbonate mineral surface reactions with ambient seawater were investigated by atomic force microscopy (AFM). A sampling method was developed in which calcite surfaces were hung at discrete depths on a sediment trap array line for a three-day deployment period in subtropical North Pacific waters. Changes in surface morphologies were examined at nanometer resolution and evaluated using as a constraint the depth profile of calcite saturation in these waters. Evidence suggests that: (1) organic films which develop on carbonate surfaces exposed to shallow seawater may be responsible for the oversaturated state of the upper oceanic water column, (2) dissolution of carbonate minerals within the shallow warm layer of the ocean could be responsible for part of the alkalinity anomaly observed in the North Pacific.