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.

Drake Passage和Scotia Sea的开放使南太平洋和南大西洋之间的水产交换。这样，可以在两个海洋之间传递热量和能量。加上塔斯曼门户的开放，这允许建立南极圆极电流（ACC）热隔离南极，这被认为是广泛冰川发作的主要原因之一。 Drake Passage和Scotia Sea内的构造运动以及气候的修改都导致ACC的强度和途径变化，以及在其中流动的水质量。 ACC的发作和这些变化已记录在福克兰高原上沉积的沉积结构中。一项对通过巡航MSM81期间收集的高分辨率地震反射数据来对沉积物漂移，韦德尔海深水和南极底部水的塑造，并提供了RV Maria S Merian，提供了有关由构造运动和气候变化而导致的循环修饰的信息。此外，这些数据还用作IODP提案的站点调查数据，以通过Drake通道研究最早的水质量交换阶段。