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

自上一次冰盛期以来，西南极冰盖(WAIS)在很短的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西南极冰盖的第三大流出区，仅次于韦德尔海和罗斯湾的冰川流域。从WAIS流入Pine Island Bay的主要冰流流经Pine Island和Thwaites冰川系统，大部分冰川-海洋沉积物进入Pine Island Bay陆架并穿过大陆斜坡进入深海。在2006年初英国南极调查的极地探险队ANT-XXIII/4号和詹姆斯·C·罗斯探险队JR141号期间，对松岛湾及其邻近大陆隆起的陆架和斜坡进行了详细的地震和其他地球物理调查以及对大片冰川-海洋沉积序列进行了地质采样(图1)。随后的数据分析的目的是重建松岛湾地区冰盖进退的旋回性、WAIS的长期动力学以及WAIS动力学与第四纪晚期全球冰川-间冰期旋回的关系。特别强调了松岛湾自上一次冰川盛期(LGM)以来的时间和空间退缩历史。此外，对自上一次冰川盛期以来所谓的冰盖加速消退与松岛湾所建议的海洋和/或火山条件之间的潜在关系的研究将是对该项目的补充。

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.