NSFPLR-NERC: Geological history constraints on the magnitude of grounding line retreat in the Thwaites Glacier system

NSFPLR-NERC：地质历史对思韦茨冰川系统接地线后退幅度的限制

基本信息

批准号：
NE/S006753/1
负责人：
Dylan Rood
金额：
$ 66.8万
依托单位：
Imperial College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FS006753%2F1
关键词：
NSFPLR NERC Geological history constraints

项目摘要

We propose to obtain geological evidence from the Thwaites-Pine Island glacier system that will show whether glaciers were less extensive than they are at present, and, if so, when. Our goals are to: (i) determine whether previous grounding-line retreat-advance cycles, as suggested by existing geological evidence, occurred in the late Holocene, and (ii) establish under what climate and sea-level boundary conditions they took place. Determining the conditions under which the Thwaites and Pine Island Glacier grounding lines have retreated and re-advanced in the past is critically relevant to determining whether or not present-day grounding-line retreat is irreversible. We will utilize two approaches to achieve these goals. To obtain geological evidence for past grounding-line retreat episodes, we will apply cosmogenic-nuclide exposure-dating of subglacial bedrock. Using drill systems recently developed in the USA for subglacial bedrock recovery and proven in the 2016-17 Antarctic field season, we will obtain subglacial bedrock from sites where ice thickness is dynamically linked to grounding line position in the Thwaites system. The observation of significant cosmogenic-nuclide concentrations in these samples would provide direct, unambiguous evidence for past episodes of thinning linked to grounding line retreat as well as constraints on their timing and duration. To reconstruct Holocene relative sea level, we will map and date raised marine and shoreline deposits throughout Pine Island Bay.

我们建议从思韦茨-派恩岛冰川系统获取地质证据，以表明冰川是否比现在更小，如果是的话，是什么时候。我们的目标是：（i）确定现有地质证据表明的先前接地线后退-前进循环是否发生在全新世晚期，以及（ii）确定它们发生的气候和海平面边界条件。确定思韦茨和松岛冰川接地线过去后退和重新前进的条件对于确定当前接地线后退是否不可逆转至关重要。我们将利用两种方法来实现这些目标。为了获得过去接地线撤退事件的地质证据，我们将应用冰下基岩的宇宙成因核素暴露测年。使用美国最近开发的用于冰下基岩恢复并在 2016-17 南极野外季节得到验证的钻探系统，我们将从冰厚度与思韦茨系统中接地线位置动态相关的地点获取冰下基岩。对这些样本中显着宇宙成因核素浓度的观察将为过去与接地线撤退相关的变薄事件及其时间和持续时间的限制提供直接、明确的证据。为了重建全新世相对海平面，我们将绘制整个松岛湾凸起的海洋和海岸线沉积物的地图并确定日期。

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）

Review article: Existing and potential evidence for Holocene grounding-line retreat and readvance in Antarctica

DOI：
10.5194/tc-2021-360
发表时间：
2021-12
期刊：
影响因子：
0
作者：
Joanne S. Johnson;R. Venturelli;G. Balco;C. Allen;S. Braddock;S. Campbell;B. Goehring;B. Hall;P. Neff;K. Nichols;D. Rood;E. Thomas;J. Woodward
通讯作者：
Joanne S. Johnson;R. Venturelli;G. Balco;C. Allen;S. Braddock;S. Campbell;B. Goehring;B. Hall;P. Neff;K. Nichols;D. Rood;E. Thomas;J. Woodward

Volcanogenic fluxes of iron from the seafloor in the Amundsen Sea, West Antarctica

DOI：
10.1016/j.marchem.2023.104250
发表时间：
2023-06
期刊：
Marine Chemistry
影响因子：
3
作者：
L. Herbert;A. Lepp;Santiago Munevar Garcia;Arianne Browning;Lauren E. Miller;J. Wellner;S. Severmann;C. Hillenbrand;Joanne S. Johnson;R. Sherrell
通讯作者：
L. Herbert;A. Lepp;Santiago Munevar Garcia;Arianne Browning;Lauren E. Miller;J. Wellner;S. Severmann;C. Hillenbrand;Joanne S. Johnson;R. Sherrell

Stability of the Antarctic Ice Sheet during the pre-industrial Holocene

DOI：
10.1038/s43017-022-00309-5
发表时间：
2022-07
期刊：
Nature Reviews Earth & Environment
影响因子：
42.1
作者：
Richard S. Jones;Joanne S. Johnson;Yucheng Lin;A. Mackintosh;J. Sefton;James A. Smith;E. Thomas;P. Whitehouse
通讯作者：
Richard S. Jones;Joanne S. Johnson;Yucheng Lin;A. Mackintosh;J. Sefton;James A. Smith;E. Thomas;P. Whitehouse

Geological insights from the newly discovered granite of Sif Island between Thwaites and Pine Island glaciers

思韦茨冰川和松岛冰川之间新发现的锡夫岛花岗岩的地质见解

DOI：
10.1017/s0954102023000287
发表时间：
2024
期刊：
Antarctic Science
影响因子：
1.6
作者：
Marschalek, James W.;Thomson, Stuart N.;Hillenbrand, Claus-Dieter;Vermeesch, Pieter;Siddoway, Christine;Carter, Andrew;Nichols, Keir;Rood, Dylan H.;Venturelli, Ryan A.;Hammond, Samantha J.
通讯作者：
Hammond, Samantha J.

Review article: Existing and potential evidence for Holocene grounding line retreat and readvance in Antarctica