Onset and modifications in intensity and pathways of water mass exchange between the Southeast Pacific and the South Atlantic with focus on the Falkland Plateau

东南太平洋和南大西洋之间水体交换强度和路径的开始和变化，重点关注福克兰高原

• 批准号: 427451853
• 负责人: Dr. Gabriele Uenzelmann-Neben
• 金额: --
• 依托单位: British Antarctic Survey
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/427451853?language=en
• 关键词: Onset; modifications; intensity; pathways; water

The opening of Drake Passage and the Scotia Sea enabled the exchange of water masses between the southern Pacific and the South Atlantic. In this way heat and energy could be transferred between the two oceans. Together with the opening of the Tasman Gateway this allowed the establishment of the Antarctic Circumpolar Current (ACC) thermally isolating Antarctica, which has been considered as one of the major causes for the onset of widespread glaciation. Both tectonic movements within Drake Passage and the Scotia Sea as well as modifications in climate have led to changes in intensity and pathway of the ACC and the water masses flowing within it. The onset of the ACC and those changes have been documented in sedimentary structures deposited on the Falkland Plateau. A study of the sediment drifts shaped by Circumpolar Deepwater, Weddell Sea Deepwater and Antarctic Bottomwater using high-resolution seismic reflection data collected during cruise MSM81 with RV Maria S Merian provides information on modifications of the circulation resulting from tectonic movements and changes in climate. Additionally, the data are used as site survey data for an IODP proposal set on studying the earliest phase of water mass exchange via Drake Passage.

德雷克海峡和斯科舍海的开通使南太平洋和南大西洋之间的水团得以交换。通过这种方式，热量和能量可以在两个大洋之间转移。再加上塔斯曼门的开放，这使得南极绕极洋流(ACC)热隔离南极洲得以建立，这被认为是大范围冰川形成的主要原因之一。德雷克海峡和斯科舍海内的构造运动以及气候的变化都导致了ACC和其中流动的水团的强度和路径的变化。ACC的开始和这些变化已经在福克兰高原沉积的沉积构造中得到了记录。用高分辨率地震反射数据研究了环极深水、韦德尔海深水和南极底水形成的沉积物漂移，提供了构造运动和气候变化导致的环流变化的信息。此外，这些数据还被用作IODP提案的现场勘测数据，该提案旨在研究通过Drake Passage进行水团交换的最早阶段。