Millenial-Scale Climate and Ocean Changes in the Western North Atlantic

本提案要求支持一项研究，以便联合收割机结合布莱克-巴哈马外脊和邻近斜坡中（~ 1500 m）至深海（~ 4700 m）许多岩心的数据，从而沿大西洋西部边界沿着一幅古水文图。这一点，结合附近的数据，从深度范围400米至1500米的小巴哈马银行，将形成最详细和广泛的古水文任何海洋盆地。 在本项目中，底栖有孔虫中的碳同位素将是古营养素的主要示踪剂，配对的底栖和浮游放射性碳分析之间的年龄差将是通气示踪剂。 这些示踪剂将应用于核心收集中的末次冰期最大值（LGM）水平，以确定深水和中深水水团之间锋面变化的程度 它们也将被应用于大约11，000年前的千年尺度事件（称为新仙女木），以比较千年尺度与轨道尺度（LGM）水文变化。 最后，千年尺度的水文变化的程度将在同位素阶段3（~30至60 kyr之前），当气候循环迅速，反复评估。

AbstractThis proposal requests support for a study to combine data from many cores from the Blake-Bahama Outer Ridges and the adjacent slope, within the intermediate (~l500m) to deep (~4700m) ocean, in order to assemble a paleohydrography along the western boundary of the Atlantic. This, combined with nearby data from the depth range 400m to 1500m at Little Bahama Bank, will form the most detailed and extensive paleohydrography for any ocean basin. For this project, carbon isotopes in benthic foraminifera will be the main tracer for paleonutrients, and the age difference between paired benthic and planktonic radiocarbon analyses will be a ventilation tracer. These tracers will be applied to the Last Glacial Maximum (LGM) level in the core collection to determine the extent of frontal changes between deep and intermediate depth water masses They will also be applied to the millennial-scale event of about 11,000 14C yrs ago (known as the Younger Dryas) to compare millennial-scale with orbital-scale (LGM) hydrographic changes. Finally, the extent of millennial scale hydrographic changes will be evaluated during isotope Stage 3 (~30 to 60 kyr before present) when climate cycled rapidly and repeatedly.