Holocene Variations in Upper North Atlantic Deep Water(Labrador Sea Water) Properties

摘要：该项目将重建Laurentian斜坡上三个岩心的全新世千年尺度的NADW属性变化，这些岩心形成了1035至1854米水深之间的样带。将对底栖有孔虫进行氧同位素、Mg/Ca、Cd/Ca和Zn/Ca测量，以表征深水特性，包括温度和盐度估计。年表将受到AMS 14C日期的限制。初步数据表明，岩心的积累速率为20-50cm/kyr。采样间隔为40-60年。拉布拉多海口附近全新世岩心浮游有孔虫G. bulloides的氧同位素和Mg/Ca测定与深水变化与地表水变化的关系

Summary: The project will reconstruct Holocene millennial-scale changes in upper NADW properties in three cores on the Laurentian Slope that form a transect between 1035 and 1854m water depth. Oxygen isotope, Mg/Ca, Cd/Ca and Zn/Ca measurements will be done on benthic foraminifers to characterize deep water properties including temperature and salinity estimates. Chronology will be constrained by AMS 14C dates. Preliminary data indicate the cores have accumulation rates of 20-50cm/kyr. Sampling intervals will range from 40-60 years. Oxygen isotope and Mg/Ca measurements of the planktic foraminifer G. bulloides in the Holocene section of a core near the mouth of the Labrador sea to relate the deep water changes to surface water changes.