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/F01466X/1
• 负责人: Peter Clarke
• 金额: $ 58.2万
• 依托单位: Newcastle 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%2FF01466X%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.

该项目旨在解决目前南极西部冰盖对全球海平面上升的影响方面的不确定性。这些估计数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（GRACE）卫星使命任务提供的时变重力数据是能够确定整个冰盖冰量平衡的唯一技术。然而，由于当代南极冰川均衡调整（GIA）模型之间的巨大差异，从总质量变化（GRACE观测）估计冰质量变化受到严重限制。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所淹没。全球定位系统的时间序列对全球影响评估提供了重要的限制，而且实际上，全球定位系统已经安装在一些关键地点。然而，目前在南极洲西部的GPS站点网络，而在当代GIA模型中的主要差异之间的区别是有用的，是太稀疏，提供所需的限制，以显着减少GIA的不确定性的GRACE信号/的高空间分辨率的GPS站点是必需的。特别是，南极南部的半岛/伦讷冰架包含一个非常大的GRACE信号，但目前的GPS站密度太稀疏，无法明确地确定重力变化的起源。在该区域有更多的岩石露头，适合于额外的数据收集，安装新的、间隔更密集的连续站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数据开发改进的西南极GIA模型，从而使我们能够计算新的准确和精确的估计冰质量的贡献，从西南极海平面上升。这些结果与NERC的战略草案（2007-2012年）直接相关，该战略草案旨在通过优先计划来研究冰冻圈如何响应全球变化，从而扩大对地球系统基本驱动力和反馈的现有知识。

项目成果

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.

Modelling quasi-periodic signals in geodetic time-series using Gaussian processes

• DOI: 10.1093/gji/ggab168
• 发表时间: 2021-05
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: A. Koulali;P. Clarke

Effect of antenna snow intrusion on vertical GPS position time series in Antarctica

南极洲天线积雪入侵对垂直GPS位置时间序列的影响

• DOI: 10.1007/s00190-020-01403-6
• 发表时间: 2020
• 期刊: Journal of Geodesy
• 影响因子: 4.4
• 作者: Koulali A

Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data.

• DOI: 10.1002/2015jf003550
• 发表时间: 2016-02
• 期刊: Journal of geophysical research. Earth surface
• 作者: Martín-Español A;Zammit-Mangion A;Clarke PJ;Flament T;Helm V;King MA;Luthcke SB;Petrie E;Rémy F;Schön N;Wouters B;Bamber JL
• 通讯作者: Bamber JL

An assessment of forward and inverse GIA solutions for Antarctica.

• DOI: 10.1002/2016jb013154
• 发表时间: 2016-09
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
• 影响因子: 3.9
• 作者: Martin-Espanol, Alba;King, Matt A.;Zammit-Mangion, Andrew;Andrews, Stuart B.;Moore, Philip;Bamber, Jonathan L.
• 通讯作者: Bamber, Jonathan L.