Planktonic Foraminiferal Mg/Ca as Indicator of Seawater Carbonate-Ion Saturation

浮游有孔虫 Mg/Ca 作为海水碳酸盐离子饱和度的指标

• 批准号: 136723532
• 负责人: Dr. Marcus Regenberg
• 金额: --
• 依托单位: Arbeitsgruppe Marine Mikropaläontologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/136723532?language=en
• 关键词: Planktonic; Foraminiferal; Mg; Ca; Indicator

Understanding how the carbonate-saturation state of seawater affects the geochemistry of foraminiferal tests is still in an elementary phase. Our primary goals are to investigate how dissolution affects the primary stable oxygen isotope and Mg/Ca signals in eight shallow-, thermocline-, and deep-dwelling planktonic foraminifera from 47 sediment-surface samples of the South China Sea. Using an integrated approach (Mg/Ca ratios, δ18O values, test weights, scanning-electron micrographs), we will determine the onset of partial dissolution with depth and quantify the dissolution bias in Mg/Ca ratios in relation to changes in the carbonate-ion concentration of bottom waters. Our work will also provide an opportunity to evaluate the sensitivity of Mg/Ca ratios as a proxy for seawater corrosiveness and assess the applicability for past climate reconstructions.

了解海水的碳酸盐饱和状态如何影响有孔虫测试的地球化学仍处于初级阶段。我们的主要目标是调查溶解如何影响主要的稳定氧同位素和Mg/Ca信号在8个浅，温跃层，和深居的浮游有孔虫从47个沉积物表面样品的南海。使用综合方法（Mg/Ca比、δ 18 O值、测试重量、扫描电子显微照片），我们将确定部分溶解随深度的开始，并量化Mg/Ca比与底层沃茨碳酸盐离子浓度变化相关的溶解偏差。我们的工作还将提供一个机会，以评估作为海水腐蚀性的代理Mg/Ca比的敏感性，并评估过去的气候重建的适用性。

项目成果

Indo-Pacific Warm Pool variability during the Holocene and Last Glacial Maximum

• DOI: 10.1029/2010pa001934
• 发表时间: 2010-12
• 期刊: Paleoceanography
• 作者: Xu, Jian;Kuhnt, Wolfgang;Holbourn, Ann;Regenberg, Marcus;Andersen, Nils
• 通讯作者: Andersen, Nils

Morphological, geochemical, and ecological differences of the extant menardiform planktonic foraminifera Globorotalia menardii and Globorotalia cultrata

现存甲藻类浮游有孔虫 Globorotalia menardii 和 Globorotalia cultrata 的形态、地球化学和生态差异

• DOI: 10.1016/j.marmicro.2010.01.002
• 发表时间: 2010
• 期刊: Marine Micropaleontology
• 影响因子: 1.9
• 作者: M. Regenberg;S. N. Nielsen;W. Kuhnt;A. Holbourn;D. Garbe-Schonberg ;N. Andersen
• 通讯作者: N. Andersen