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

基本信息

  • 批准号:
    NE/F007558/1
  • 负责人:
  • 金额:
    $ 4.1万
  • 依托单位:
  • 依托单位国家:
    英国
  • 项目类别:
    Research Grant
  • 财政年份:
    2008
  • 资助国家:
    英国
  • 起止时间:
    2008 至 无数据
  • 项目状态:
    已结题

项目摘要

One of the most controversial issues in environmental research today relates to the stability of the present-day climate regime and, in particular, whether human induced changes are sufficient to result in a significant restructuring of climate. An important development has been the identification of abrupt and intense climate changes in the recent geological past, illustrating that climate events originating from natural forcing may also occur on the timescales of relevance to humanity. These abrupt climate shifts are widely believed to involve changes in the behaviour of the global system of surface and subsurface ocean currents, the oceanic thermohaline circulation (THC). In order to understand the natural variability of the THC it is necessary to generate from key locations long (several 100,000 years) continuous palaeoclimate records with high millennial-scale (1000 years) temporal resolution. However, such long continuous records with sufficient temporal resolution are not always available due to the generally low sedimentation in marine environments (commonly ~2-3 cm/1000 years). Only cores from sediment drifts, where sedimentation rates are often increased up to ~40 cm/1000 years, present the possibility to create such records. These sediment drifts are produced by strong bottom currents, which erode material from one location and deposit it at another. The disadvantage of drift sediments is that they may contain little biogenic material, such as foraminifera that are commonly used to reconstruct surface water properties and the lateral distribution of deep water masses. A potential way around this problem is to investigate physical parameters related to deep ocean flow, such as the sortable silt mean proxy (SS-mean), which is the mean grain size of the 10-63 micron terrigenous sediment sub-fraction. In contrast to the foraminiferal stable isotope record, which might be patchy due to the lack of foraminifera, the SS-mean record is generally uninterrupted, since terrigenous sediments are deposited continuously. Furthermore, the sorting of the sediment is directly related to the physical flow speed of the deep ocean current in which the sediment grains are transported and deposited, which allows the generation of high-resolution record of palaeocurrent speed throughout the past. Sediment drift deposits at the Blake-Bahama Outer Ridge (BBOR) in the sub-tropical Northwest Atlantic Ocean present an archive for changes in the Deep Western Boundary Current (DWBC) flow at very high resolution. As a major component of the THC, the DWBC carries recently ventilated waters (i.e. North Atlantic Deep Water) equatorward. Previous studies have utilised grain size analyses in combination with foraminiferal stable isotope analysis in order to reconstruct strength and flow characteristics of the DWBC on millennial to Milankovitch timescales. However, no continuous record yet exists of the temporal variability and timing of DWBC flow variability in greater detail over the past few 100,000 year glacial-interglacial cycles. Here we propose to focus on changes in the near bottom flow speed and hydrography of the DWBC recorded at ODP Leg 172, Site 1061 (4047 m water depth) on the deep BBOR. We will generate high resolution (sample spacing of ~800 years) SS-mean and foraminiferal stable isotope records for the past 450,000 years, or the interval between Marine Isotope Stage 12 to the Holocene. In order to identify dominant periodic changes in the DWBC through this interval we will use spectral analysis. Non-stationarity in these statistics, i.e variation of the signals in both amplitude and frequency over long periods of time, will be investigated using wavelet analysis. The findings will further increase our understanding of the connections between variability in deep ocean circulation and the boundary conditions of the climate system, thus reducing current uncertainties surrounding the prediction of climate variability.
当今环境研究中最具争议的问题之一涉及当今气候制度的稳定性,特别是人类引起的变化是否足以导致气候的重大重组。一个重要的发展是查明了最近地质历史中突然和剧烈的气候变化,这表明源于自然强迫的气候事件也可能发生在与人类有关的时间尺度上。人们普遍认为,这些突然的气候变化涉及全球表层和次表层洋流系统-海洋温盐环流-的行为变化。为了了解THC的自然变化,有必要从关键地点产生长(几十万年)的连续古气候记录,具有高千年尺度(1000年)的时间分辨率。然而,由于海洋环境中的沉积作用一般较低(通常约为2-3厘米/1000年),并不总是能够获得具有足够时间分辨率的这种长时间连续记录。只有沉积物漂移的岩心才有可能创造这样的记录,因为沉积速率通常增加到约40厘米/1000年。这些沉积物漂移是由强大的底流造成的,底流从一个地方侵蚀物质,然后在另一个地方存款。漂流沉积物的缺点是,它们可能含有很少的生物物质,如通常用于重建地表水性质和深水水体横向分布的有孔虫。解决这个问题的一个可能办法是调查与深海水流有关的物理参数,如可分选的泥沙平均代用指标(SS-平均值),这是10-63微米陆源沉积物亚组分的平均粒度。与有孔虫稳定同位素记录相反,由于缺乏有孔虫,有孔虫稳定同位素记录可能是不完整的,SS平均记录通常是不间断的,因为陆源沉积物是连续沉积的。此外,沉积物的分选与沉积物颗粒在其中运输和沉积的深洋流的物理流速直接相关,这使得能够生成过去古水流速度的高分辨率记录。在亚热带西北大西洋的布莱克-巴哈马外脊(BBOR)的沉积物漂移沉积提出了一个档案的变化,在深西部边界流(DWBC)流在非常高的分辨率。作为THC的主要组成部分,DWBC将最近通风的沃茨(即北大西洋深水)向赤道输送。以前的研究利用粒度分析结合有孔虫稳定同位素分析,以重建千年米兰科维奇时标的强度和流动特性的DWBC。然而,还没有连续的记录存在的时间变化和时间的DWBC流量变化更详细地在过去的几个10万年的冰川间冰期循环。在这里,我们建议把重点放在深水BBOR上ODP 172航段1061(水深4047 m)记录的DWBC近底流速和水文地理的变化上。我们将生成过去450,000年或海洋同位素阶段12至全新世之间的高分辨率(样本间隔约800年)SS平均值和有孔虫稳定同位素记录。为了确定DWBC在此期间的主要周期性变化,我们将使用频谱分析。这些统计的非平稳性,即在长时间内的振幅和频率的信号的变化,将使用小波分析进行研究。这些发现将进一步增进我们对深海环流的变异性与气候系统边界条件之间的联系的了解,从而减少目前围绕气候变异性预测的不确定性。

项目成果

期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

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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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 项目类别:
    Research Grant
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
  • 批准号:
    NE/G015260/1
  • 财政年份:
    2009
  • 资助金额:
    $ 4.1万
  • 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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 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:
    $ 4.1万
  • 项目类别:
    Standard Grant

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Collaborative Research: U.S. Crossroads—Connectivity of the North Atlantic Deep Western Boundary Current through the Subpolar-Subtropical Transition Zone
合作研究:美国十字路口——北大西洋深西边界流通过副极地-副热带过渡区的连通性
  • 批准号:
    2318948
  • 财政年份:
    2023
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Continuing Grant
Collaborative Research: U.S. Crossroads—Connectivity of the North Atlantic Deep Western Boundary Current through the Subpolar-Subtropical Transition Zone
合作研究:美国十字路口——北大西洋深西边界流通过副极地-副热带过渡区的连通性
  • 批准号:
    2318947
  • 财政年份:
    2023
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Continuing Grant
Oxygen pathways into the deep ocean: investigating boundary current ventilation in the western Irminger Sea
进入深海的氧气通道:调查伊尔明格海西部的边界流通风
  • 批准号:
    2122579
  • 财政年份:
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Collaborative Research: Completing a 10-Year Record of Deep Western Boundary Current Observations at Line W: A Contribution to the Atlantic Meridional Overturning Circulation Study
合作研究:完成W线西部深边界流观测10年记录:对大西洋经向翻转环流研究的贡献
  • 批准号:
    1332667
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Collaborative Research: Completing a 10-Year Record of Deep Western Boundary Current Observations at Line W; A Contribution to the Atlantic Meridional Overturning Circulation Study
合作研究:完成W线西部深边界海流观测10年记录;
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    1332834
  • 财政年份:
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Holocene reconstructions of Iceland-Scotland Overflow and the Deep Western Boundary Current
冰岛-苏格兰溢流和西部深边界流的全新世重建
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Denmark Strait Overflow Water: A New Paradigm for the Origin of the Deep Western Boundary Current
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    0959381
  • 财政年份:
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Line W: A Sustained Measurement Program Sampling the North Atlantic Deep Western Boundary Current and Gulf Stream at 39oN
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  • 批准号:
    0726720
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Millennial-scale changes in position and intensity of the Deep Western Boundary Current (DWBC) during the last glacial period
末次冰期深西部边界流(DWBC)位置和强度的千年尺度变化
  • 批准号:
    5434877
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    2004
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    $ 4.1万
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Investigating the Characteristics and Consequences of Interannual Variations in the Northwest Atlantic's Deep Western Boundary Current
西北大西洋深西边界流年际变化特征及后果研究
  • 批准号:
    0241354
  • 财政年份:
    2003
  • 资助金额:
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  • 项目类别:
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