Quantifying West Antarctic mantle viscosity via precise GPS measurement of Earth's response to surface mass balance anomalies
通过精确的 GPS 测量地球对表面质量平衡异常的响应来量化西南极地幔粘度
基本信息
- 批准号:NE/R002029/1
- 负责人:
- 金额:$ 80.07万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2018
- 资助国家:英国
- 起止时间:2018 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Satellite measurements of ice sheet change are necessary to understand and help predict sea level rise, but are contaminated by a phenomenon known as Glacial Isostatic Adjustment (GIA). GIA is a form of ongoing solid Earth deformation in response to previous ice sheet mass changes. It can in principle be measured wherever we have access to bedrock, but this is not the case for much of Antarctica and therefore (and also for reasons of practicability) we require physically-based mathematical models of GIA. These models must be calibrated and validated, which can be done with the aid of precise measurements of Earth deformation made using continuous GPS receivers sited on bedrock.Continuous GPS data are therefore crucial to the determination of past and present ice mass change across Antarctica and the quantification of feedbacks between ice dynamics and solid Earth deformation. A fundamental property that must be quantified in such studies is the rheology of the solid Earth (its deformational response to forces acting on it). The Earth's mantle shows viscous behaviour over longer timescales but behaves elastically in the short term (as observed e.g. by the passage of seismic waves), a phenomenon known as viscoelasticity. Recent studies have demonstrated that there are large spatial variations in mantle viscosity across Antarctica, but at present the magnitude of such variations is not known. We propose to pioneer a new approach to determining spatially-variable mantle viscosity that involves analysing the viscoelastic response of the solid Earth to episodic surface mass balance (SMB) anomalies across Antarctica. Our approach makes use of the fact that in regions where the magnitude of surface mass change is well known, observations of the accompanying solid Earth response allow the quantification of the rheological properties of the Earth.In order to achieve our goal we require access to high-precision, long-duration GPS records. Fortunately there is already an extensive GPS network in West Antarctica, which although erected piecemeal via a series of NERC-funded projects (and equivalent overseas grants), now has the potential to deliver such records over the next few years. We therefore propose to overhaul the existing GPS network that lies within the remit of UK logistical support in Antarctica; we will extend the time series at a strategic subset of the existing sites, and transmit all data to open access servers via satellite. The resulting step change in precision and data accessibility will enable us to achieve our scientific goals and at the same time will benefit the international scientific community: the provision of open access GPS time series for West Antarctica will contribute to emerging data inversion activities and make it possible to ground-truth ice mass balance estimates delivered by the multi-million-dollar Gravity Recovery and Climate Experiment (GRACE) Follow-on mission, which is due for launch in 2017.
冰盖变化的卫星测量对于了解和帮助预测海平面上升是必要的,但被称为冰川均衡调整(GIA)的现象所污染。GIA是一种持续的固体地球变形形式,以响应先前的冰盖质量变化。原则上,只要我们能接触到基岩,就可以测量它,但南极大部分地区的情况并非如此,因此(也是出于实用性的原因)我们需要基于物理的GIA数学模型。必须对这些模型进行校准和验证,这可以借助安放在基岩上的连续全球定位系统接收器对地球变形进行的精确测量来完成,因此,连续的全球定位系统数据对于确定南极洲过去和现在的冰量变化以及量化冰动力学和固体地球变形之间的反馈至关重要。在这种研究中必须量化的一个基本性质是固体地球的流变学(其对作用于其上的力的变形反应)。地幔在较长的时间尺度上表现出粘性行为,但在短期内表现出弹性行为(如通过地震波的通过所观察到的),这种现象称为粘弹性。最近的研究表明,整个南极洲的地幔粘度存在很大的空间变化,但目前尚不清楚这种变化的幅度。我们建议开拓一种新的方法来确定空间可变的地幔粘度,包括分析固体地球的粘弹性响应,情节表面质量平衡(SMB)异常整个南极洲。我们的方法利用这样一个事实,即在地区的表面质量变化的幅度是众所周知的,伴随着固体地球响应的观测允许量化的流变学性质的地球。为了实现我们的目标,我们需要访问高精度,长时间的GPS记录。幸运的是,在南极洲西部已经有了一个广泛的GPS网络,虽然通过一系列NERC资助的项目(以及同等的海外赠款)建立了一个零碎的网络,但现在有可能在未来几年内提供这样的记录。因此,我们建议彻底改革属于联合王国在南极后勤支助范围内的现有全球定位系统网络;我们将在现有地点的一个战略子集延长时间序列,并通过卫星将所有数据传输到开放访问服务器。由此产生的精度和数据可访问性的阶跃变化将使我们能够实现我们的科学目标,同时将使国际科学界受益:为西南极洲提供开放获取的GPS时间序列将有助于新兴的数据反演活动,并使数百万美元的重力恢复和气候实验(GRACE)提供的地面实况冰质量平衡估计成为可能。执行使命,定于2017年发射。
项目成果
期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Supplementary material to "Antarctic ice sheet paleo-constraint database"
“南极冰盖古约束数据库”的补充材料
- DOI:10.5194/essd-2022-398-supplement
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Lecavalier B
- 通讯作者:Lecavalier B
A commercial finite element approach to modelling Glacial Isostatic Adjustment on spherical self-gravitating compressible earth models
在球形自重力可压缩地球模型上模拟冰川等静压调整的商业有限元方法
- DOI:10.1093/gji/ggad354
- 发表时间:2023
- 期刊:
- 影响因子:2.8
- 作者:Huang P
- 通讯作者:Huang P
The Influence of Sediments, Lithosphere and Upper Mantle (Anelastic) With Lateral Heterogeneity on Ocean Tide Loading and Ocean Tide Dynamics
- DOI:10.1029/2022jb025200
- 发表时间:2022-11
- 期刊:
- 影响因子:0
- 作者:Pingping Huang;R. Sulzbach;V. Klemann;Yoshiyuki Tanaka;H. Dobslaw;Z. Martinec;Maik Thomas
- 通讯作者:Pingping Huang;R. Sulzbach;V. Klemann;Yoshiyuki Tanaka;H. Dobslaw;Z. Martinec;Maik Thomas
Antarctic ice sheet paleo-constraint database
南极冰盖古约束数据库
- DOI:10.5194/essd-2022-398
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Lecavalier B
- 通讯作者:Lecavalier B
A global, spherical finite-element model for post-seismic deformation using <i>Abaqus</i>
用于震后变形的全局球形有限元模型
- DOI:10.5194/gmd-15-2489-2022
- 发表时间:2022
- 期刊:
- 影响因子:5.1
- 作者:Nield G
- 通讯作者:Nield G
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Michael Bentley其他文献
Educational utility of observational workplace-based assessment modalities in Australian vocational general practice training: a cross-sectional study
- DOI:
10.1186/s12909-025-07328-y - 发表时间:
2025-05-23 - 期刊:
- 影响因子:3.200
- 作者:
Alison Fielding;Benjamin Mundy;Amanda Tapley;Sarah Gani;Rula Ali;Michael Bentley;Rachael Boland;Lina Zbaidi;Elizabeth Holliday;Jean Ball;Mieke van Driel;Linda Klein;Parker Magin - 通讯作者:
Parker Magin
Pruners: Providing reproducibility for uncovering non-deterministic errors in runs on supercomputers
Pruners:提供可重现性,以发现超级计算机上运行中的非确定性错误
- DOI:
- 发表时间:
2019 - 期刊:
- 影响因子:0
- 作者:
Kento Sato;I. Laguna;Gregory L. Lee;M. Schulz;C. Chambreau;Simone Atzeni;Michael Bentley;G. Gopalakrishnan;Zvonimir Rakamaric;G. Sawaya;Joachim Protze;D. Ahn - 通讯作者:
D. Ahn
FLiT: Cross-platform floating-point result-consistency tester and workload
FLiT:跨平台浮点结果一致性测试器和工作负载
- DOI:
10.1109/iiswc.2017.8167780 - 发表时间:
2017 - 期刊:
- 影响因子:0
- 作者:
G. Sawaya;Michael Bentley;Ian Briggs;G. Gopalakrishnan;D. Ahn - 通讯作者:
D. Ahn
Social wasps as models to study the major evolutionary transition to superorganismality.
社会黄蜂作为模型来研究向超有机体的主要进化转变。
- DOI:
- 发表时间:
2018 - 期刊:
- 影响因子:5.3
- 作者:
Daisy Taylor;Michael Bentley;S. Sumner - 通讯作者:
S. Sumner
Companion to Historiography
史学的伴侣
- DOI:
10.4324/9780203991459 - 发表时间:
2006 - 期刊:
- 影响因子:0
- 作者:
Michael Bentley - 通讯作者:
Michael Bentley
Michael Bentley的其他文献
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{{ truncateString('Michael Bentley', 18)}}的其他基金
AGATA: Precision Spectroscopy of Exotic Nuclei
AGATA:奇异核的精密光谱学
- 批准号:
ST/T000546/1 - 财政年份:2020
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
Nuclear Physics Consolidated Grant
核物理综合拨款
- 批准号:
ST/P003885/1 - 财政年份:2017
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
Reducing the uncertainty in estimates of the sea level contribution from the westernmost part of the East Antarctic Ice Sheet
减少东南极冰盖最西端海平面贡献估计的不确定性
- 批准号:
NE/K003674/1 - 财政年份:2014
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
Dating and modelling fast ice-sheet grounding-line retreat over the last 4000 years in the SW Weddell Sea, Antarctica
南极洲威德尔海西南部过去 4000 年来冰盖接地线快速退缩的年代测定和建模
- 批准号:
NE/J008176/1 - 财政年份:2013
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
iSTAR-D: The contribution to sea-level rise from the Amundsen Sea sector of Antarctica
iSTAR-D:南极洲阿蒙森海区对海平面上升的贡献
- 批准号:
NE/J005673/1 - 财政年份:2012
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
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 - 财政年份:2009
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
MRI: Acquisition of a Scanning Electron Microscope for a Multi-User Core Facility in Science, Engineering, and Technology
MRI:为科学、工程和技术领域的多用户核心设施采购扫描电子显微镜
- 批准号:
0923435 - 财政年份:2009
- 资助金额:
$ 80.07万 - 项目类别:
Standard Grant
Nuclear Structure, Astrophysics and Reactions at FAIR
FAIR 的核结构、天体物理学和反应
- 批准号:
ST/G000670/1 - 财政年份:2009
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
DIRECT MEASUREMENT & SAMPLING OF SUBGLACIAL LAKE ELLSWORTH: A multidisciplinary investigation of life in extreme environments & ice sheet history
直接测量
- 批准号:
NE/G00336X/1 - 财政年份:2009
- 资助金额:
$ 80.07万 - 项目类别:
Research Grant
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