Foraminiferal Barium as a Palechemical Tracer of the Oceans

钡在海洋中的分布与 耐火成分、二氧化硅和碱度。 因此 基于Ba的古水团Ba的重建 有孔虫壳的含量可以用来探测 过去海洋的循环和化学。 先前的工作已经 表明Ba在大脑中的分布发生了显著变化， 冰川海洋不能用气候变化来解释 在海洋循环中。 本研究将1）确定如何 忠实的浮游和底栖有孔虫记录器 海水钡通过进一步的核心顶部研究以及培养 直接测定对 （2）扩大和增加细节， 在18 kyr冰川最大期的海洋Ba测量; 3） 获得赤道海底Ba的长期（220 kyr）记录 太平洋;以及，4）使用碳酸钡作为融水的示踪剂 在最后一次冰消期流入墨西哥湾

The distribution of Ba in the ocean is similar to the refractory components, silica and alkalinity. Therefore reconstructions of Ba in ancient water masses based on the Ba content of foraminifera shells can be used to probe the circulation and chemistry of past oceans. Previous work has shown that the dramatically altered distribution of Ba in the glacial oceans ban be explained by climatically driven changes in ocean circulation. This research will 1) ascertain how faithfully planktonic and benthic foraminifera recorder seawater Ba via further core top studies as well as culturing of planktonic foraminifera to directly determine the uptake of Ba into their shells; 2) broaden and increase the detail of oceanic Ba measurements at the 18 kyr Glacial Maximum; 3) acquire a long (220 kyr) record of benthic Ba in the equatorial Pacific; and, 4) use planktonic Ba as a tracer of meltwater influx to the Gulf of Mexico at the last deglaciation.