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THINNING HISTORY OF THE FOUNDATION-THIEL TROUGH ICE STREAM: A KEY CONTROL ON DEGLACIATION OF THE WEST ANTARCTIC ICE SHEET, WEDDELL SEA EMBAYMENT

基金会-蒂尔槽冰流的变薄历史：威德尔海海湾西南极冰盖消融的关键控制因素

基本信息

批准号：
NE/F014228/1
负责人：
Stewart Freeman
金额：
$ 7.35万
依托单位：
Scottish Universities Environmental Research Centre
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FF014228%2F1
关键词：
THINNING HISTORY FOUNDATION THIEL TROUGH

项目摘要

The Antarctic ice sheet is the largest on earth and any instability is likely to dominate global sea level change. We therefore require models of the ice sheet to make more reliable and robust predictions of future change. One problem in meeting this challenge is the lack of past data on deglaciation with which to initialize and calibrate the models. This problem has been particularly acute in the Weddell Sea embayment and in particular its eastern part where the Foundation - Thiel Trough has been a principal drainage route for the West Antarctic Ice Sheet (WAIS), and its southern extension may be a potential location for future instability. We propose here an integrated field and modelling study that will exploit the opportunity of several emerging field datasets from a range of different disciplines, collect fresh data from a crucial location, and investigate past and future deglaciation using sophisticated ice sheet models. To understand the history of ice thinning and retreat along the trough we will adopt a dipstick approach to survey the Foundation Ice Stream, an upstream extension of the ice stream that occupied the trough during the last ice age. We will determine the thinning history of this Foundation-Thiel Trough Ice Stream from geomorphology and exposure age dating: techniques that have been used effectively to provide insight into ice sheet history in other regions of Antarctica. We will apply a 3D model - incorporating significant recent theoretical advances - to the whole of the WAIS in order to understand the forcing mechanisms for the ice stream history we measure. We will go on to use this model to predict the likely future stability of the WAIS in terms of both long-term trajectory and any response to climate change scenarios, and in particular whether it will retreat further along the Foundation-Thiel Trough.

南极冰盖是地球上最大的冰盖，任何不稳定都可能主导全球海平面变化。因此，我们需要冰盖模型来对未来的变化做出更可靠、更稳健的预测。应对这一挑战的一个问题是缺乏过去的冰消数据来初始化和校准模型。这个问题在威德尔海海湾尤其严重，尤其是其东部，那里的基金会 - 泰尔海槽一直是西南极冰盖 (WAIS) 的主要排水路线，其南部延伸可能是未来不稳定的潜在地点。我们在此提出一项综合的现场和建模研究，该研究将利用来自一系列不同学科的几个新兴现场数据集的机会，从关键位置收集新数据，并使用复杂的冰盖模型研究过去和未来的冰川消融。为了了解冰沿海槽变薄和退缩的历史，我们将采用量油尺方法来调查基础冰流，这是上一个冰河时代占据海槽的冰流的上游延伸。我们将通过地貌学和暴露年龄测定来确定该基金会-蒂尔槽冰流的变薄历史：这些技术已被有效地用于深入了解南极洲其他地区的冰盖历史。我们将把 3D 模型（结合了最新的重大理论进展）应用于整个 WAIS，以了解我们测量的冰流历史的强迫机制。我们将继续使用该模型来预测 WAIS 未来可能的稳定性，包括长期轨迹和对气候变化情景的任何响应，特别是它是否会沿着基金会-蒂尔海槽进一步后退。