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

基本信息

批准号：
NE/F01550X/1
负责人：
Richard Hindmarsh
金额：
$ 5.04万
依托单位：
British Antarctic Survey
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%2FF01550X%2F1
关键词：
Improved models West Antarctic glacial

项目摘要

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 GRACE satellite mission the only technique capable of determining ice mass balance for the entire ice sheet. Accurate correction of total mass change (measured by GRACE) to obtain ice mass change is, however, complicated by a lack of confidence in accurately correcting for glacial isostatic adjustment (GIA). Indeed, recent published estimates of ice mass change for West Antarctica are swamped by the present uncertainty in GIA models. Global Positioning System (GPS) time series offer important constraints on GIA and, indeed, have been installed in many of the critical locations. However, the current network of GPS sites, whilst allowing separation of wildly different GIA models, is too sparse to provide the tight constraints required for producing improved models / 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 station density there is too sparse to unambiguously determine the origin of the gravity change. Further suitable rock outcrops are available in this region for additional data collection and situating there new, more densely spaced, continuous sites would provide the required constraints. Here, we propose to place improved constraints on an Antarctic GIA model through newly collected GPS-data, thereby allowing us to compute new accurate and precise estimates of ice mass contributions to sea level rise from West Antarctica.

该项目解决了西南极冰盖对全球海平面上升的当前不确定性。这些估计值主要源自空间大地测量（高度法或时间变化的重力）测量，并具有来自Grace卫星任务的时间变量重力数据，这是唯一能够确定整个冰盖冰质量平衡的技术。然而，由于缺乏准确校正冰川等静态调节（GIA）的信心，准确校正总质量变化（通过宽限期衡量）以获得冰质量变化是复杂的。实际上，最近发表的对南极西部冰块变化的估计值被GIA模型中的当前不确定性所淹没。全球定位系统（GPS）时间序列对GIA提供了重要的限制，并且实际上已安装在许多关键位置。但是，当前的GPS站点网络允许分离出大不同的GIA模型，而不是稀疏，无法提供产生改进的模型所需的紧密约束，则需要对GPS站点的高空间分辨率。特别是，南极南极/罗恩冰架包含一个非常大的宽限信号，但是当前的站点密度太稀疏，无法明确确定重力变化的起源。该区域中提供了进一步的合适岩石露头，可用于其他数据收集，并在那里置于新的，更密集的连续位点的位置，将提供所需的约束。在这里，我们建议通过新收集的GPS-DATA对南极GIA模型进行改进的约束，从而使我们能够计算出对从南极西部的海平面上升的新的准确和精确的冰量贡献。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

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
通讯作者：
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

Getting around Antarctica: new high-resolution mappings of the grounded and freely-floating boundaries of the Antarctic ice sheet created for the International Polar Year