Climate and geodynamic control of past changes in thermohaline circulation and faunal exchange through the Denmark Strait

气候和地球动力学对丹麦海峡过去温盐环流和动物群交换变化的控制

• 批准号: 5345013
• 负责人: Professor Dr. Michael Sarnthein
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2001
• 资助国家: 德国
• 起止时间: 2000-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5345013?language=en
• 关键词: Climate; geodynamic; control; past; changes

The Denmark Strait and Iceland-Scotland Ridge serve as gateways for giant currents of intermediate water flowing from the European Nordic Seas into the North Atlantic. This 'Overflow' forms a main deepwater source for the global ocean. At the same time it leads to the advection of warm and highly saline surface water from the Atlantic into the Nordic Seas and thus, to todays fairly warm, but highly variable climate in Europe. It is the objective of this study to trace the variablity of the thermohaline circulation system focussed in the Denmark Strait at multidecadal resolution over geological times, specifically for the last 80.000 years and for some of the major warm interglacial stages in the Pleistocene and Late Pliocene. This especially implies the reconstruction of the paleosalinity and density gradients in the surface layer and of the differential quality and paleo-14C ages of the Overflow water in the deep ocean... Global teleconnections of centennial-to-millennialscale climate change between high and low-latitude sites will be reconstucted together with Themes B and C, using a joint ultrahigh-resolution time scale bases onD-0 and Milankovitch cycles.

丹麦海峡和冰岛-苏格兰海脊是从欧洲北欧海流入北大西洋的中间水流的门户。这种“溢出”形成了全球海洋的主要深水来源。与此同时，它导致温暖和高盐度的地表水从大西洋平流进入北欧海，从而导致今天欧洲相当温暖，但气候多变。本研究的目的是跟踪变化的温盐环流系统集中在丹麦海峡在几十年的分辨率超过地质时代，特别是在过去的80.000年和一些主要的温暖间冰期在更新世和上新世晚期。这尤其意味着表层古盐度和密度梯度的重建以及深海溢流水的质量差和古~（14）C年龄的重建。利用D-0和Milankovitch旋回的超高分辨率时间尺度，结合主题B和C，重建高纬度和低纬度地区百年至千年尺度气候变化的全球遥相关。