Reconstructing paleoclimate and ice-sheet dynamics from continental slope deposits

从大陆坡沉积物重建古气候和冰盖动力学

• 批准号: NE/R018189/1
• 负责人: Jenny Gales
• 金额: $ 4.7万
• 依托单位: Plymouth University
• 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: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FR018189%2F1
• 关键词: Reconstructing; paleoclimate; ice; sheet; dynamics

The aim of the project is to determine the different sediment types on the eastern Ross Sea continental slope, Antarctica. This will help to understand how the Ross Sea shelf and slope developed over time, and the different processes that operated there. This will allow us to reconstruct how the West Antarctic Ice Sheet and climate changed in the past, for example, how far ice extended from the Antarctic continent, how the ice fluctuated, and when these changes occurred. This is important in order for us to understand how ice may change around Antarctica in the future, and the effects this will have on global sea level. Understanding these changes is of significant global importance because Antarctica is experiencing rapid ice loss. This ice loss has doubled in recent years in places. This is due to changes in ocean and atmospheric circulation, with increased observations of warm water masses on the Antarctic shelf. Ocean warming is understood to be one of the main factors causing rapid ice-sheet retreat and instability, leading to potentially irreversible effects. There have also been changes in deep ocean currents in recent years. These currents have global importance as they transfer cold, salty waters to the deep ocean which eventually feed into global ocean currents. This ultimately affects global climate. Oceanographic measurements over the last three decades show significant changes in temperature, salinity, density and depth of the currents, impacting the supply of dense water to the deep ocean. To understand the record of past processes over millions of years, we will collect sediment samples by drilling up to 1 km beneath the seafloor using the drill ship JOIDES Resolution during the International Ocean Discovery Program (IODP) Expedition 374. The expedition is scheduled for January 2018. The main scientific objective is to identify what processes were operating on the continental slope over millions of years and how these processes were influenced by glacial / climate cycles. We will use a range of sampling techniques including obtaining sediment samples and downhole logging data, collected by lowering specialised logging equipment down the drilled holes in the seafloor. We will identify the different slope processes by analysing the sediment core material. This will help us to understand the occurrence, characteristics, frequency and timing of the different sediment deposits which will shed light on what processes were operating in the region. We will look at how the sediment deposits relate to glacial / climate cycles, based on analysis carried out during IODP Expedition 374. We will combine this with regional geophysical data, including information on the seafloor bathymetry and structure beneath the seafloor, to provide information about the shape of the seafloor surface and sub-surface. This will allow recent processes to be identified from seafloor morphology.

该项目的目的是确定东罗斯海洋大陆斜坡（南极）的不同沉积物类型。这将有助于了解Ross Sea架子和坡度如何随着时间的流逝而发展，以及在那里运作的不同过程。例如，这将使我们能够重建过去的南极冰盖和气候如何变化，例如，冰与南极大陆延伸了多远，冰的波动以及这些变化发生了。这对于我们了解未来南极周围可能会发生变化以及这将对全球海平面产生的影响很重要。理解这些变化具有重要的全球重要性，因为南极正在经历快速的冰丢失。近年来，这种冰的损失增加了一倍。这是由于海洋和大气循环的变化，随着南极架子上温水质量的观察增加。海洋变暖被认为是引起快速冰层静修和不稳定的主要因素之一，导致潜在的不可逆影响。近年来，深洋流也发生了变化。这些电流在将寒冷的咸水转移到深海时具有全球重要性，最终进入全球洋流。这最终影响了全球气候。在过去的三十年中，海洋学测量表明，温度，盐度，密度和深度的变化显着变化，影响了深海的浓水供应。为了了解数百万年来过去过程的记录，我们将通过在国际海洋发现计划（IODP）374中使用钻头在海底下方进行1公里的钻探来收集沉积物样品。该探险计划定于2018年1月进行。主要科学目标是确定在跨越千里市场的过程中，这些进程是在跨越这些过程中的流行过程和这些年龄段的流行过程。我们将使用一系列的采样技术，包括获取沉积物样品和下井记录数据，该数据通过将专用的伐木设备降低到海底的钻孔。我们将通过分析沉积物核心材料来确定不同的斜率过程。这将有助于我们了解不同沉积物沉积物的发生，特征，频率和时机，这将阐明该地区的哪些过程。我们将根据IODP Expedition 374期间进行的分析来研究沉积物与冰川 /气候周期之间的关系。我们将将其与区域地球物理数据结合在一起，包括有关海底测深的信息的信息和海底下面的结构，以提供有关海面表面和地下表面和地下层面的信息。这将使最近的过程从海底形态中识别出来。

项目成果

Timing, frequency and nature of sedimentary processes operating on the eastern Ross Sea continental slope during the Pleistocene- a record from IODP Expedition 374

更新世期间罗斯海东部大陆坡沉积过程的时间、频率和性质——IODP 374号探险队的记录

• DOI: 10.5194/egusphere-egu21-3009
• 发表时间: 2021
• 作者: King M

Assessing the influence of climate on Antarctic submarine gully evolution

评估气候对南极海底沟壑演化的影响

• DOI: 10.5194/egusphere-egu24-8780
• 发表时间: 2024
• 作者: Gales J

Bottom current control on sediment deposition between the Iselin Bank and the Hillary Canyon (Antarctica) since the late Miocene: An integrated seismic-oceanographic approach

• DOI: 10.1016/j.dsr.2021.103606
• 发表时间: 2021-09-22
• 期刊: DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
• 影响因子: 2.4
• 作者: Conte, R.;Rebesco, M.;Lucchi, R. G.
• 通讯作者: Lucchi, R. G.

Role of cold, dense water in the development of submarine canyon morphology

寒冷、稠密的水在海底峡谷形态发展中的作用

• 发表时间: 2019
• 作者: J.A Gales

Data report: Site U1523 composite section and stratigraphic splice based on X-ray fluorescence data, IODP Expedition 374

数据报告：基于 X 射线荧光数据的 U1523 站点复合剖面和地层拼接，IODP Expedition 374

• DOI: 10.14379/iodp.proc.374.202.2022
• 发表时间: 2022
• 期刊: Proceedings of the International Ocean Discovery Program
• 作者: Kulhanek, D.K.;Prunella, C.;McLaughlin, J.R.;Griffin, B.;McKay, R.M.;Patterson, M.O.;Gales, J.;Shevenell, A.E.;van Peer, T.E.
• 通讯作者: van Peer, T.E.