Reconstructing millennial-scale variability in deep-water circulation of the North Atlantic during the early Pleistocene

重建早更新世期间北大西洋深水环流的千年尺度变化

基本信息

  • 批准号:
    NE/G015260/1
  • 负责人:
  • 金额:
    $ 3.25万
  • 依托单位:
  • 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

项目摘要

Summary: The observation of repeated, large and abrupt climatic shifts during the last glacial and deglacial periods has raised current concern over the possibility of abrupt climate change in the future. Yet there is still considerable uncertainty concerning the mechanisms of such changes in the past, even to the extent that we do not fully understand how their effects are transmitted throughout the climate system. Records from Greenland ice cores and North Atlantic sediments suggest that high latitudes in the Northern Hemisphere were repeatedly subjected to very large and abrupt fluctuations in temperature during the last glaciation, commonly referred to as Dansgaard-Oeschger (D-O) oscillations. A single D-O oscillation comprised an abrupt warming event (typically >10 degrees C rise in mean annual temperature over Greenland) within just a few decades, followed by a few centuries of more gradual cooling before an abrupt return to cold conditions. These transitions have been linked to variations in the strength of the deep ocean circulation, which may have affected marine heat transports to the North Atlantic and Nordic Seas. It is increasingly recognised that to understand the processes of abrupt climate change it is necessary to document the variability of the climate system during a wide range of different boundary conditions (e.g. insolation, global ice volume, atmospheric CO2 levels). Here we propose to use marine sediment cores from the sup-polar North Atlantic obtained during Ocean Drilling Programme Leg 164, Site 982, to examine the nature of millennial-scale variability in deep ocean flow speeds of Iceland Scotland Overflow Water (a precursor of North Atlantic Deep Water, the watermass responsible for initiating the global thermohaline circulation) in response to the changing orbital and sub-orbital climate regimes immediately prior to, and across the so called 'mid-Pleistocene climate transition' (MPT; ~1.2-0.7 million years ago). During this transition the dominant influence of orbital forcing changed from obliquity forcing (41,000 years) to eccentricity (100,000 years) modulated precession (23,000 years) thereafter. The palaeocurrrent data generated within this project will be integrated with existing high-resolution records of deep ocean ventilation (based on benthic carbon isotopes) and surface ocean variability (ice rafted debris, stable isotopes) to establish a detailed view of the relationships among these important climate components and further our understanding of how their millennial-scale variability evolved through changing boundary conditions of the mid-Pleistocene. Such palaeo-observations are important for providing input to climate models and evaluating numerical simulations of climate and ice-sheet behaviours.
总结:在末次冰期和冰消期观察到的反复、大规模和突然的气候变化引起了目前对未来气候突变可能性的关注。然而,关于过去这种变化的机制仍然存在相当大的不确定性,甚至到了我们不完全了解其影响如何在整个气候系统中传播的程度。来自格陵兰冰芯和北大西洋沉积物的记录表明,在末次冰期期间,北方半球高纬度地区反复遭受非常大的突然温度波动,通常被称为Dansgaard-Oeschger(D-O)振荡。单一的D-O振荡包括在短短几十年内突然变暖的事件(通常格陵兰岛年平均温度上升>10摄氏度),随后是几个世纪的逐渐冷却,然后突然回到寒冷的条件。这些转变与深海环流强度的变化有关,这可能影响到向北大西洋和北欧海的海洋热量输送。人们越来越认识到,要了解气候突变的过程,有必要记录气候系统在各种不同边界条件(如日照、全球冰量、大气CO2水平)下的变率。在这里,我们建议使用大洋钻探计划第164航次982号站点期间获得的北大西洋超极区海洋沉积物岩心,以研究冰岛苏格兰溢流水深海流速千年尺度变化的性质。(北大西洋深水的前身,负责启动全球温盐环流的水团),以响应不断变化的轨道和亚在所谓的“中更新世气候过渡”(MPT; ~ 120 - 70万年前)之前和之后的轨道气候状况。在这一转变过程中,轨道强迫的主要影响从偏心率强迫(41,000年)转变为偏心率(100,000年)调制岁差(23,000年)。该项目产生的古水流数据将与现有的深海通风(基于海底碳同位素)和表层海洋变化(冰筏碎片,稳定同位素)的高分辨率记录相结合,以详细了解这些重要气候组成部分之间的关系,并进一步了解它们的千年尺度变化如何通过中更新世边界条件的变化而演变。这种古观测对于为气候模型提供投入和评价气候和冰盖行为的数值模拟十分重要。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Abrupt changes in deep Atlantic circulation during the transition to full glacial conditions
  • DOI:
    10.1002/palo.20025
  • 发表时间:
    2013-06
  • 期刊:
  • 影响因子:
    0
  • 作者:
    D. Thornalley;S. Barker;Julia Becker;I. Hall;G. Knorr
  • 通讯作者:
    D. Thornalley;S. Barker;Julia Becker;I. Hall;G. Knorr
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Ian Hall其他文献

The English school and the classical approach: Between modernism and interpretivism
英国学派与古典方法:现代主义与解释主义之间
  • DOI:
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M. Bevir;Ian Hall
  • 通讯作者:
    Ian Hall
The scapegoating of mothers: a call for change.
母亲的替罪羊:呼吁变革。
The English School’s Histories and International Relations
英语学校的历史和国际关系
Check your assumptions: Further scrutiny of basic model frameworks of antimicrobial resistance.
检查您的假设:进一步审查抗菌素耐药性的基本模型框架。
  • DOI:
    10.1016/j.jtbi.2022.111277
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    2
  • 作者:
    Martin Grunnill;Ian Hall;T. Finnie
  • 通讯作者:
    T. Finnie
BxDF material acquisition, representation, and rendering for VR and design
用于 VR 和设计的 BxDF 材质采集、表示和渲染

Ian Hall的其他文献

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{{ truncateString('Ian Hall', 18)}}的其他基金

UKIODP Moratorium Award - IODP Expedition 361, Southern African Climates - Ian Hall
UKIODP 暂停奖 - IODP 361 探险队,南部非洲气候 - Ian Hall
  • 批准号:
    NE/P000037/1
  • 财政年份:
    2016
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Research Grant
Climate of the LAst Millennium (CLAM): An Integrated Data-Model Approach to Reconstruct and Interpret Annual Variability in North Atlantic Circulation
上个千年的气候(CLAM):重建和解释北大西洋环流年度变化的综合数据模型方法
  • 批准号:
    NE/N001176/1
  • 财政年份:
    2015
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Research Grant
Study of common and rare genetic variants in respiratory health: the UK Biobank Lung Exome Evaluation (UK BiLEVE) consoertium
呼吸系统健康中常见和罕见遗传变异的研究:英国生物银行肺外显子组评估 (UK BiLEVE) 联盟
  • 批准号:
    MC_PC_12010
  • 财政年份:
    2012
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Intramural
Defining the genetic contribution and functional role to altered lung function of genes identified by GWAS meta-analysis
定义 GWAS 荟萃分析确定的基因对改变肺功能的遗传贡献和功能作用
  • 批准号:
    G1000861/1
  • 财政年份:
    2011
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Research Grant
Doctoral Training Grant (DTG) to provide funding for 2 PhD studentships
博士培训补助金 (DTG) 为 2 名博士生提供资助
  • 批准号:
    NE/I52787X/1
  • 财政年份:
    2010
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Training Grant
ULTRA-HIGH-RESOLUTION PROXY RECORD OF LAST MILLENNIUM NORTH ATLANTIC TEMPERATURE ANOMALIES ('ULTRA')
上个千年北大西洋温度异常的超高分辨率代理记录(“ULTRA”)
  • 批准号:
    NE/H020357/1
  • 财政年份:
    2010
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Research Grant
DEEP WESTERN BOUNDARY CURRENT VARIABILITY IN THE SUBTROPICAL NORTHWEST ATLANTIC OCEAN DURING THE PAST 450 KYR
过去 450 KYR 期间副热带西北大西洋深西边界海流变化
  • 批准号:
    NE/F007558/1
  • 财政年份:
    2008
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Research Grant
What controls calcium homeostasis in human airway smooth muscle?
什么控制人气道平滑肌中的钙稳态?
  • 批准号:
    G0701390/1
  • 财政年份:
    2008
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Research Grant
US-Turkey Cooperative Research: Wave Propagation in Multi-Layered Materials
美国-土耳其合作研究:多层材料中的波传播
  • 批准号:
    0242772
  • 财政年份:
    2003
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Standard Grant
Improvement to an Undergraduate Materials Science Teaching Laboratory
本科生材料学教学实验室的改进
  • 批准号:
    9051471
  • 财政年份:
    1991
  • 资助金额:
    $ 3.25万
  • 项目类别:
    Standard Grant

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