Sensitivity of Quaternary West Antarctic Ice Sheet advances and retreats in Pine Island Bay

松岛湾第四纪西南极冰盖进退的敏感性

• 批准号: 44661160
• 负责人: Professor Dr. Karsten Gohl
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/44661160?language=en
• 关键词: Sensitivity; Quaternary; West; Antarctic; Ice

The West Antarctic Ice-Sheet (WAIS) has experienced dramatic volume changes within short time periods since the last glacial maximum. The Pine Island Bay in the southern Amundsen Sea forms the third-largest outflow area for the West Antarctic ice-sheet next to the ice drainage basins of the Weddell Sea and the Ross Embayment. The main ice streams from the WAIS into Pine Island Bay flow through the Pine Island and Thwaites Glacier systems, through which most of the glacial-marine sediments onto the shelf of Pine Island Bay and across the continental slope into the deep sea have been transported. Detailed seismic and other geophysical surveys as well as geological sampling of the glacial-marine sedimentary sequences over large areas from the shelf and slope of Pine Island Bay and its adjacent continental rise were conducted during RV Polarstern expedition ANT-XXIII/4 and RV James C. Ross expedition JR141 of the British Antarctic Survey in early 2006 (Fig. 1). The aim of the subsequent data analysis is to reconstruct the cyclicity of the ice-sheet advances and retreats in the area of Pine Island Bay, the long-term dynamics of the WAIS and the relationship of WAIS dynamics with the global glacial-interglacial cycles of the Late Quaternary. A particular emphasis is placed on the chronological and spatial retreat history in Pine Island Bay since the last glacial maximum (LGM). Furthermore, studies of the potential relation between the supposed accelerated ice-sheet retreat since the last glacial maximum and suggested oceanographic and/or volcanic conditions in Pine Island Bay will complement the project.

自末次盛冰期以来，南极西部冰盖（WAIS）在短时间内经历了巨大的体积变化。阿蒙森海南部的松岛湾形成了仅次于威德尔海和罗斯海湾冰流盆地的西南极冰盖第三大流出区。从WAIS流入松岛湾的主要冰流流经松岛和思韦茨冰川系统，大部分冰川-海洋沉积物通过该系统被输送到松岛湾陆架上，并穿过大陆坡进入深海。 2006 年初，英国南极调查局的 RV Polarstern 探险队 ANT-XXIII/4 和 RV James C. Ross 探险队 JR141 期间，对松岛湾的陆架和斜坡及其邻近大陆隆起的大面积冰川-海洋沉积序列进行了详细的地震和其他地球物理调查以及地质采样（图 1）。后续数据分析的目的是重建松岛湾地区冰盖进退的周期性、WAIS的长期动态以及WAIS动态与晚第四纪全球冰期-间冰期旋回的关系。特别强调自末次盛冰期（LGM）以来松岛湾的时间和空间退缩历史。此外，对自末次盛冰期以来假定的冰盖加速退缩与松岛湾建议的海洋和/或火山条件之间潜在关系的研究将补充该项目。