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首页> 外文期刊>Paleoceanography >Cocos (Keeling) Corals Reveal 200 Years of Multidecadal Modulation of Southeast Indian Ocean Hydrology by Indonesian Throughflow
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Cocos (Keeling) Corals Reveal 200 Years of Multidecadal Modulation of Southeast Indian Ocean Hydrology by Indonesian Throughflow

机译：Cocos（Keeling）珊瑚揭示了200年的东南印度洋水文的多型调制印度尼西亚流行

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摘要

The only low latitude pathway of heat and salt from the Pacific Ocean to the Indian Ocean, known as Indonesian Throughflow (ITF), has been suggested to modulate Global Mean Surface Temperature (GMST) warming through redistribution of surface Pacific Ocean heat. ITF observations are only available since ~1990s, and thus, its multidecadal variability on longer time scales has remained elusive. Here we present a 200 year bimonthly record of geochemical parameters (δ~(18)O-Sr/Ca) measured on Cocos (Keeling) corals tracking sea surface temperature (SST; Sr/Ca) and sea surface salinity (SSS; seawater- δ~(18)O═δ~(18)O_(sw)) in the southeastern tropical Indian Ocean (SETIO). Our results show that SETIO SSS and δ~(18)O_(sw) were impacted by ITF transport over the past 60 years, and therefore, reconstructions of Cocos δ~(18)O_(sw) hold information on past ITF variability on longer time spans. Over the past 200 years ITF leakage into SETIO is dominated by the interannual climate modes of the Pacific Ocean (El Ni?o-Southern Oscillation) and Indian Ocean (Indian Ocean Dipole). Pacific decadal climate variability (represented by the Pacific Decadal Oscillation) significantly impacted ITF strength over the past 200 years determining the spatiotemporal SST and SSS advection into the Indian Ocean on multidecadal time scales. A comparison of our SETIO δ~(18)O_(sw) record to GMST shows that ITF transport varied in synchrony with global warming rate, being predominantly high/low during GMST warming slowdown/acceleration, respectively. This hints toward an important role for the ITF in global warming rate modulation.
机译：已经建议通过表面太平洋热量再分布调节印度洋的唯一被称为印度洋的热量和盐的唯一低纬度自1990年代以来，ITF观察仅适用，因此，在较长时间尺度上的多个变化仍然是难以捉摸的。在这里，我们展示了200年的地球化学参数（δ〜（18）o-sr / ca）的双月纪录（Δ〜（18）o-sr / ca）跟踪海表面温度（sst; sr / ca）和海表面盐度（sss;海水 - Δ〜（18）O═δ〜（18）O_（SW））在东南热带印度洋（Setio）。我们的结果表明，Setio SSS和δ〜（18）O_（SW）受到过去60年来的ITF运输影响，因此，COCOSΔ〜（18）O_（SW）的重建于超过ITF可变性的信息更长时间跨度。在过去的200年里，ITF进入Setio泄露是由太平洋的营制气候模式（El Ni？O-Southern振荡）和印度洋（印度洋海洋偶极）的统治。太平洋截止解局气候变异性（由太平洋横跨振荡代表）在过去200年中明显影响了ITF强度，从而确定了时尚SST和SSS对印度洋对多型时间尺度的平流。我们的SetioΔ〜（18）O_（SW）记录到GMST的比较表明，ITF传输在全球变暖率的同步变化，PMST温度放缓/加速期间主要高/低。这提示了在全球变暖率调制中对ITF的重要作用。

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  • 来源
    《Paleoceanography》 |2018年第1期|共13页
  • 作者

    Rick Hennekam; Jens Zinke; Erik van Sebille; Malou ten Have; Geert-Jan A. Brummer; Gert-Jan Reichart;

  • 作者单位

    NIOZ Royal Netherlands Institute for Sea Research Department of Ocean Systems and Utrecht University Texel Netherlands;

    Paleontology Section Freie Universit?t Berlin Berlin Germany;

    GranthamInstitute and Department of Physics Imperial College London London UK;

    NIOZ Royal Netherlands Institute for Sea Research Department of Ocean Systems and Utrecht University Texel Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Ocean Systems and Utrecht University Texel Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Ocean Systems and Utrecht University Texel Netherlands;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    Cocos (Keeling) Corals Reveal; 200 Years; Multidecadal Modulation;

    机译：Cocos（Keeling）珊瑚揭示;200年;多型调制;

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