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

来自加州大学圣地亚哥分校的一名研究人员提议通过对Ca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将测量其他河流水样的钙同位素组成，以增加可用的数据库，并帮助限制当前河流的钙输入。此外，这些样品的结果将用于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，以及Ca在粘土上的吸附是否影响同位素信号。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的钙同位素组成，而没有在生物碳酸盐中观察到的分异。最后，PI将分析来自赤道太平洋西部ODP 806站点的沉积物中单个有孔虫（Globigerinoides sacculifer）的样本，该样本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的代用物。

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.