Carbon Dioxide Controls: Pleistocene Carbonate Saturation Fluctuations in the West-Equatorial Pacific

二氧化碳控制：西赤道太平洋更新世碳酸盐饱和度波动

• 批准号: 8816167
• 负责人: Wolfgang Berger
• 金额: $ 5.33万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-01 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816167&HistoricalAwards=false
• 关键词: Carbon; Dioxide; Controls; Pleistocene; Carbonate

We have generated a quantitatively valid dissolution index for modern sediments in the west-equatorial Pacific, which is tied to carbonate saturation values. We wish to apply this index to a series of long cores, taken across the lysocline on the slope of Ontong-Java Plateau, in order to reconstruct the saturation history of deep waters in this region, for the last 450 kyr. The time scale will be provided by a fit of oxygen isotope stratigraphy to the Imbrie et al. (1984) standard. Absolute rates of dissolution will be derived from comparison of synchronous instantaneous accumulation rates of cores from above and below the lysocline, checked against dissolution indices. In conjunction with data on the isotopic compositions of benthic foraminifera, the calibrated saturation curves will allow determination of probable pCO2 of deep waters, and provide useful contraints on the reconstruction of the late Pleistocene carbon chemistry and circulation. Our focus is on the contrast between middle and late Brunhes time, and on that between the extreme states (glacial-interglacial) and the extreme rates of change (glacierization-deglaciation).

我们已经产生了一个定量有效的溶解指数 西赤道太平洋的现代沉积物， 与碳酸盐饱和度值有关。 我们希望将此应用于 索引到一系列的长核心，采取跨溶跃层上 Ontong-Java高原的斜坡，以重建 该地区深层沃茨的饱和历史， 45万 时间刻度将由氧气提供 根据Imbrie等人（1984）的标准进行同位素地层学研究。 通过比较得出绝对溶出速率 的同步瞬时积累率的核心， 溶跃层之上和之下，检查溶解 指数。 结合同位素组成的数据 底栖有孔虫，校准的饱和曲线将 允许确定深水沃茨的可能pCO 2，以及 为后期的重建提供了有用的约束 更新世碳化学与循环。 我们的重点是 布鲁赫中晚期的对比， 极端状态（冰川-间冰期）和 极端变化率（冰川化-冰川消退）。