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Millennial-scale oscillations of the westerly jet path during the last glacial period

机译：上一个冰川期西风射流路径的千年尺度振荡

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摘要

It has been established that East Asian summer monsoon intensity varies with Dansgaard-Oeschger cycles, suggesting a connection between the climates of East Asia and the North Atlantic on a millennial timescale. However, the dynamics of such a connection are still unsolved. Here we demonstrate that temporal changes in the provenance of aeolian dust in Japan Sea sediments, which we interpret to reflect changes in the westerly jet path over East Asia, exhibit variations in harmony with Dansgaard-Oeschger cycles. The dominance of dust with a Mongolian Gobi provenance during stadials suggests a westerly jet axis located to the south of the Himalaya-Tibetan Plateau throughout most of the year, whereas the co-dominance of dust from both the Taklimakan Desert and the Mongolian Gobi during interstadials suggests that the westerly jet axis jumped to the north of the Tibetan Plateau at latest in summer. As the shift of the westerly jet axis to the north of the Tibetan Plateau is closely related to the onset of the East Asian summer monsoon, changes of the westerly jet path apparently critically affect the teleconnection between the climates of Asia and North Atlantic on a millennial timescale.
机译：已经确定，东亚夏季风强度随Dansgaard-Oeschger循环而变化，这表明东亚和北大西洋的气候在千禧年尺度上存在联系。但是，这种连接的动态性仍未解决。在这里，我们证明了日本海沉积物中风沙尘源的时间变化（我们解释为反映东亚西风急流路径的变化）表现出与Dansgaard-Oeschger周期一致的变化。季风中尘埃占主导地位的是蒙古戈壁，这表明一年中大部分时间都位于喜马拉雅山-西藏高原南部的西风急流轴上，而塔克拉玛干沙漠和蒙古戈壁的尘埃占主导地位这表明最晚在夏季，西风急流轴跳到了青藏高原的北部。由于西风急流轴向青藏高原北部的偏移与东亚夏季风的爆发密切相关，因此，西风急流路径的变化显然严重影响了亚洲与北大西洋气候之间的遥相关。时间尺度。

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  • 来源
    《Journal of Asian earth sciences》 |2011年第6期|p.1214-1220|共7页
  • 作者

    Kana Nagashima; Ryuji Tada; Atsushi Tani; Youbin Sun; Yuko Isozaki; Shin Toyoda; Hitoshi Hasegawa;

  • 作者单位

    Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan;

    Department of Earth and Planetary Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan;

    Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan;

    State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710054, China;

    Department of Earth and Planetary Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan;

    State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710054, China;

    Department of Applied Physics, Faculty of Science, Okayama University of Science, 1-1 Ridai, Okayama 700-0005, Japan;

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  • 正文语种 eng
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  • 关键词

    dansgaard-oeschger cycles; aeolian dust; westerly jet; east asian summer monsoon; japan sea; esr;

    机译：dansgaard-oeschger周期;风尘;西风;东亚夏季风;日本海;esr;

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