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

摘要：该项目将重建劳伦斯斜坡上三个岩芯的全新世千年尺度上NADW特性的变化，这三个岩芯形成了1035米至1854米水深之间的横断面。将对底栖有孔虫进行氧同位素、镁/钙、镉/钙和锌/钙测量，以确定深水特性，包括温度和盐度估计。年表将受AMS 14C日期的限制。初步数据表明，岩心的累积速率为20-50 cm/Kyr。抽样间隔从40-60年不等。通过对拉布拉多海入海口附近全新世岩心浮游有孔虫大泡有孔虫的氧同位素和镁钙比的测定，将深水变化与表层水变化联系起来。

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.