Improved models of West Antarctic glacial isostatic adjustment through new crustal motion data

通过新的地壳运动数据改进南极西部冰川均衡调整模型

• 批准号: NE/F01452X/1
• 负责人: Michael Bentley
• 金额: $ 16.41万
• 依托单位: Durham University
• 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%2FF01452X%2F1
• 关键词: Improved; models; West; Antarctic; glacial

This project addresses the current uncertainty in the present-day contribution of the West Antarctic Ice Sheet to global sea level rise. These estimates are primarily derived from space geodetic (altimetry or time-variable gravity) measurements, with time-variable gravity data from the Gravity Recovery and Climate Experiment (GRACE) satellite mission the only technique capable of determining ice mass balance for the entire ice sheet. Estimates of ice mass change from the total mass change (observed by GRACE) are, however, severely limited due to the large discrepancies between contemporary models of Antarctic glacial isostatic adjustment (GIA). Indeed, recent published estimates of ice mass change for West Antarctica are swamped by this uncertainty. Global Positioning System (GPS) time series offer important constraints on GIA and, indeed, GPS have been installed in a few of the critical locations. However, the current network of GPS sites in West Antarctica, whilst useful in discriminating between major differences in contemporary GIA models, is too sparse to provide the constraints required to significantly reduce the GIA uncertainty in the GRACE signal / for that a high spatial resolution of GPS sites is required. In particular, the southern Antarctic Peninsula/Ronne Ice Shelf contains a very large GRACE signal, but the current GPS station density there is too sparse to unambiguously determine the origin of the gravity change. Further rock outcrops suitable for additional data collection are available in this region and installing new, more densely spaced, continuous sites would provide the required constraints. Here, we propose to develop improved models of West Antarctic GIA through newly collected long-term GPS data, thereby allowing us to compute new accurate and precise estimates of ice mass contributions to sea level rise from West Antarctica. These results are of direct relevance to NERC's draft strategy (2007-2012) to expand on existing knowledge of the fundamental driving forces and feedbacks of the Earth system through prioritising plans to investigate how the cryosphere responds to global change.

该项目解决了目前西南极冰盖对全球海平面上升的影响的不确定性。这些估计主要来自空间大地测量(测高或时变重力)测量，重力恢复和气候实验卫星飞行任务的时变重力数据是能够确定整个冰盖冰质量平衡的唯一技术。然而，由于当代南极冰川均衡调整(GIA)模型之间的巨大差异，根据总质量变化(GRACE)估计冰量变化的方法受到严重限制。事实上，最近公布的对南极洲西部冰量变化的估计被这种不确定性淹没了。全球定位系统(GPS)的时间序列对GIA提供了重要的限制，事实上，GPS已经安装在几个关键地点。然而，目前南极洲西部的GPS站点网络虽然有助于区分当代GIA模型中的主要差异，但过于稀疏，无法提供显著降低GRACE信号中GIA不确定性所需的约束条件，因此需要GPS站点的高空间分辨率。特别是，南极半岛南部/罗恩冰架含有非常大的GRACE信号，但目前那里的GPS站密度太稀疏，无法明确确定重力变化的原点。该地区还有更多适合收集更多数据的岩石露头，安装新的、更密集的、连续的地点将提供所需的限制。在这里，我们建议通过新收集的长期GPS数据来开发改进的西南极GIA模型，从而使我们能够计算出新的准确和精确的冰块对西南极海平面上升的贡献估计。这些结果与国家环境研究中心的战略草案(2007-2012年)直接相关，该战略草案旨在通过确定冰冻圈如何对全球变化作出反应的计划的优先次序，扩大现有的关于地球系统基本驱动力和反馈的知识。

项目成果

Antarctic ice rises and rumples: Their properties and significance for ice-sheet dynamics and evolution

• DOI: 10.1016/j.earscirev.2015.09.004
• 发表时间: 2015-11
• 期刊: Earth-Science Reviews
• 影响因子: 12.1
• 作者: K. Matsuoka;R. Hindmarsh;G. Moholdt;M. J. Bentley;H. Pritchard;Joel Brown;H. Conway;R. Drews;G. Durand;D. Goldberg;T. Hattermann;J. Kingslake;J. Lenaerts;C. Martín;R. Mulvaney;K. Nicholls;F. Pattyn;N. Ross;T. Scambos;P. Whitehouse

Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet readvance

• DOI: 10.1016/j.epsl.2014.12.039
• 发表时间: 2015-03-01
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Bradley, Sarah L.;Hindmarsh, Richard C. A.;King, Matt A.
• 通讯作者: King, Matt A.

Increased ice loading in the Antarctic Peninsula since the 1850s and its effect on glacial isostatic adjustment

• DOI: 10.1029/2012gl052559
• 发表时间: 2012-09
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: G. Nield;P. Whitehouse;Matt A. King;P. Clarke;M. J. Bentley

Exploring the Last Continent - An Introduction to Antarctica

探索最后的大陆——南极洲简介

• DOI: 10.1007/978-3-319-18947-5_25
• 发表时间: 2015
• 作者: Bentley M

Late Holocene relative sea levels near Palmer Station, northern Antarctic Peninsula, strongly controlled by late Holocene ice-mass changes

南极半岛北部帕尔默站附近的晚全新世相对海平面，受到晚全新世冰块变化的强烈控制

• DOI: 10.1016/j.quascirev.2018.09.017
• 发表时间: 2018
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: Simms, Alexander R.;Whitehouse, Pippa L.;Simkins, Lauren M.;Nield, Grace;DeWitt, Regina;Bentley, Michael J.
• 通讯作者: Bentley, Michael J.