The Calcium Cycle and Sea Surface Temperatures: An Investigation Using Ca Isotopes

钙循环和海面温度：利用 Ca 同位素进行的研究

• 批准号: 0116185
• 负责人: J. Douglas Macdougall
• 金额: $ 27.74万
• 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: 2001
• 资助国家: 美国
• 起止时间: 2001-10-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0116185&HistoricalAwards=false
• 关键词: Calcium; Cycle; Sea; Surface; Temperatures

ABSTRACTOCE-0116185A researcher from the University of California-San Diego proposes to continue his studies on the calcium (Ca) cycle in the ocean by making additional measurements of Ca inputs and outputs. Initially, the PI will measure the Ca isotopic composition of additional river water samples to increase the available database and help constrain the present-day river input of Ca. In addition, results from these samples will be used to assess whether the lithology and maturity of the drainage basin affects the Ca isotopic composition of river samples and if adsorption of Ca onto clays influences the isotopic signal. Next, Dr. Macdougall plans to collaborate with Dr. Paytan at Stanford to ascertain if barite samples record the Ca isotopic composition of seawater without the fractionation observed in biogenic carbonate. Lastly, the PI will analyze samples of a single foraminifera (Globigerinoides sacculifer) in downcore sediments from ODP Site 806 in the western Equatorial Pacific which document the Quaternary oxygen isotopic record, to determine whether Ca isotopes can be used as a paleo-temperature proxy.

加利福尼亚大学圣地亚哥分校的一位研究人员建议通过对钙的输入和输出进行额外的测量来继续他对海洋中钙（Ca）循环的研究。 最初，PI将测量额外的河水样本的钙同位素组成，以增加可用的数据库，并帮助限制目前的河流输入的钙。 此外，从这些样品的结果将被用来评估流域的岩性和成熟度是否影响河流样品的钙同位素组成，如果钙吸附到粘土影响同位素信号。 接下来，麦克杜格尔博士计划与斯坦福大学的佩坦博士合作，确定重晶石样本是否记录了海水中钙的同位素组成，而没有在生物碳酸盐中观察到的分馏。 最后，PI将分析来自赤道西太平洋ODP 806站点的钻孔沉积物中的单一有孔虫（Globigerinoides sacculifer）样品，这些样品记录了第四纪氧同位素记录，以确定Ca同位素是否可以用作古温度代用指标。