Foraminiferal Barium as a Palechemical Tracer of the Oceans

Ba在海洋中的分布与难熔组分、二氧化硅和碱度相似。因此，基于有孔虫壳中Ba含量重建古代水体中的Ba含量可以用来探测过去海洋的循环和化学。先前的研究表明，冰川海洋中Ba分布的急剧变化可以用海洋环流中气候驱动的变化来解释。本研究将：(1)通过进一步的岩心顶部研究和浮游有孔虫的培养，确定浮游和底栖有孔虫对海水Ba的真实记录程度，从而直接确定Ba进入其壳的吸收率；2)扩大和增加了18kyr极盛期海洋Ba测量的细节；3)获得赤道太平洋底栖Ba的长（220 kyr）记录；4)利用浮游Ba作为最后一次消冰期流入墨西哥湾的融水的示踪剂。

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.