Tracing Tasman Leakage since the middle Miocene

追踪中新世中期以来的塔斯曼泄漏

基本信息

项目摘要

The southern hemisphere oceans are strongly coupled. The exchange of water and heat between the South Pacific, Indian and South Atlantic oceans is fundamental to the global thermohaline circulation. However, the relevance of interocean exchange at intermediate water depths between the Pacific and Indian oceans has only recently been established for the present-day. Different contemporary oceanographic models identify significant transport from the Pacific into the Indian Ocean at ~1000 m water depth, originating in the Tasman Sea. The so-called Tasman Leakage has however never been identified in a paleoceanographic context. This proposal aims to evaluate the onset of this pathway of interocean exchange, and is designed to constrain Tasman Leakage variability in response to climatic (north-south migration of climate belts) as well as to tectonic processes (northward movement of the Australian continent). Ocean Drilling Program (ODP) Sites 752 and 754 on Broken Ridge (eastern Indian Ocean) provide well-suited sedimentary archives to address these questions: Both sites are situated within the Tasman Leakage flow path, at a present-day intermediate water depth of ~1070 m. Their late Oligocene to recent intervals consist of sub-horizontal pelagic carbonate-rich sequences that allow for the use of different isotopic and elemental proxies. When compared to a series of existing sedimentary archives in the southern Indian Ocean and southwest Pacific, the newly-generated proxy records for Site 752 and 754 will provide a unique opportunity to evaluate the role of Tasman Leakage in regulating Pacific-Indian Ocean exchange since the late Oligocene.
南半球的海洋是紧密相连的。南太平洋、印度洋和南大西洋之间的水热交换对全球温盐环流至关重要。然而,直到最近才确定太平洋和印度洋之间中间水深的海洋间交换对当今的意义。不同的现代海洋学模型确定了从太平洋到印度洋的重要运输,水深约1 000米,起源于塔斯曼海。然而,所谓的塔斯曼泄漏从未在古海洋学背景下被确定。本提案旨在评估这一海洋间交换路径的开始,并旨在限制塔斯曼泄漏变化对气候(气候带南北迁移)以及构造过程(澳大利亚大陆向北移动)的响应。位于Broken Ridge(东印度洋)的大洋钻探计划(ODP)752和754号站点提供了非常适合解决这些问题的沉积档案:这两个站点都位于塔斯曼泄漏流路径内,目前的中间水深约为1070 m。它们的渐新世晚期到最近的间隔由次水平的远洋碳酸盐丰富的序列,允许使用不同的同位素和元素代理。与南印度洋和西南太平洋的一系列现有沉积档案相比,新生成的752和754号站点的代理记录将提供一个独特的机会来评估塔斯曼泄漏在调节太平洋-印度洋交换中的作用,因为晚渐新世。

项目成果

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Professor Dr. David De Vleeschouwer, Ph.D.其他文献

Professor Dr. David De Vleeschouwer, Ph.D.的其他文献

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{{ truncateString('Professor Dr. David De Vleeschouwer, Ph.D.', 18)}}的其他基金

Marine isotope stage M2 (~3.3 Ma) in the southern hemisphere: constraining the climatic drivers of a short-term glaciation event during the mid-Pliocene warm Period.
南半球海洋同位素阶段M2(~3.3 Ma):限制上新世中期温暖期短期冰川事件的气候驱动因素。
  • 批准号:
    319497259
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Astronomical signatures in Late Devonian black shales of the Rhenish Massif.
莱茵地块晚泥盆世黑色页岩的天文特征。
  • 批准号:
    451461400
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
SCATTER - Investigating a potential systematic link between the flux of cosmic material and Earth’s orbital eccentricity throughout the Phanerozoic.
散射 - 研究整个显生宙宇宙物质通量与地球轨道偏心率之间潜在的系统联系。
  • 批准号:
    531055721
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
A Big Data approach to reconstruct Australia’s hydroclimate (Neogene - Quaternary)
重建澳大利亚水文气候的大数据方法(新第三纪 - 第四纪)
  • 批准号:
    527307807
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes

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OCE-PRF Unraveling Southern Hemisphere westerly wind variability through the last ~150 ky using Tasman Sea sediments
OCE-PRF 利用塔斯曼海沉积物揭示了过去约 150 ky 的南半球西风变化
  • 批准号:
    2126500
  • 财政年份:
    2021
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    --
  • 项目类别:
    Standard Grant
The Impact of Tasman Gateway Opening on Early Paleogene Oceans and Climate
塔斯曼门户开放对古近纪早期海洋和气候的影响
  • 批准号:
    NE/R012490/1
  • 财政年份:
    2018
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    --
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    Research Grant
Landscapes of production and punishment: The Tasman Peninsula 1830-77
生产与惩罚的景观:塔斯曼半岛 1830-77
  • 批准号:
    DP170103642
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Discovery Projects
Iron sources and cycling in the Tasman Sea
塔斯曼海的铁源和循环
  • 批准号:
    DP110100108
  • 财政年份:
    2011
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    --
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    Discovery Projects
Trans Tasman Radiation Oncology Group (TROG)
跨塔斯曼放射肿瘤学组 (TROG)
  • 批准号:
    nhmrc : 351217
  • 财政年份:
    2005
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    --
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Completion of the Tasman International Geospace Environment Radar (TIGER)
塔斯曼国际地​​球空间环境雷达(TIGER)完成
  • 批准号:
    LE0451713
  • 财政年份:
    2004
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    --
  • 项目类别:
    Linkage Infrastructure, Equipment and Facilities
Plaeoceanographic and paleoclimatic evolution in the southwestern Tasman Sea during Pleistocene to Quaternary - implications for paleoproductivity, paleo sea surface temperature and terrigenous flux from geochemical proxy data.
塔斯曼海西南部更新世至第四纪的古海洋和古气候演化——地球化学代理数据对古生产力、古海表面温度和陆源通量的影响。
  • 批准号:
    5267956
  • 财政年份:
    2000
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    --
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Measurement and Interpretation of Chlorofluorocarbon Distributions in the Tasman Sea (WOCE Hydrographic Section P6W)
塔斯曼海氟氯烃分布的测量和解释(WOCE 海道剖面 P6W)
  • 批准号:
    9206169
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    1992
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    --
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    Standard Grant
Structural and Tectonic Evolution of the Tasman Orogenic Zone in Northern Tasmania
塔斯马尼亚北部塔斯曼造山带的结构和构造演化
  • 批准号:
    8996295
  • 财政年份:
    1989
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    --
  • 项目类别:
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Structural and Tectonic Evolution of the Tasman Orogenic Zone in Northern Tasmania
塔斯马尼亚北部塔斯曼造山带的结构和构造演化
  • 批准号:
    8820084
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