Holocene Changes in the Gulf Stream and Western Sargasso Sea

科学摘要：这项研究将获得并分析在哈特拉斯角附近的北大西洋西部亚热带沉积物岩心。将对岩心进行多代理研究，以确定海洋表面温度梯度和深度温度梯度和营养成分含量。地表水指标将包括浮游有孔虫的氧同位素和Mg/Ca测量。底水指标包括底栖有孔虫的氧、碳同位素、Mg/Ca、Cd/Ca和Ba/Ca。整个全新世选定的时间序列研究的样本分辨率将解决千年尺度的变异性。将在几个岩心中对过去3000年进行更详细的采样，以研究全新世晚期的世纪尺度变化。年龄模型将基于大约500年间隔的AMS 14C日期空间。

Science Summary: This study will obtain and analyze sediment cores recovered in the subtropical western North Atlantic off Cape Hatteras. Multiproxy study of the cores will be done to determine gradients in sea surface temperature and depth gradients in temperature and nutrient content. Surface water proxies will include oxygen isotope and Mg/Ca measurements of planktic foraminifers. Bottom water proxies will include oxygen and carbon isotope, Mg/Ca, Cd/Ca, and Ba/Ca of benthic foraminifers. Sample resolution of selected time-series studies for the entire Holocene will resolve millennial scale variability. More detailed sampling of the last 3,000 years will be done in several cores to study century scale variability of the late Holocene. Age models will be based on AMS 14C dates space at about 500 yr intervals.