インド洋の海底コアからみたモンスーンの消長 The History of Monsoons Recorded in Marine Sediments of the Indian Ocean

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The deep sea sediments off Oman contain records of the history of the Southwest Monsoon, as seen from lithology, paleontology, isotopes, geochemistry and magnetostratigraphy.<BR>Glacial-interglacial fluctuations in upwelling related to the Southwest Monsoon can be traced back 250ka. In contrast, from 450 to 250ka, carbon isotope differences indicating upwelling strength did not show such distinct cyclicity. Upwelling was strong during interglacial stages and had less fluctuation, and was weak during glacial stages with large fluctuation. This upwelling and climate can be traced back to the late Miocene. The strongest upwelling is estimated to have occurred in the Pliocene-Pleistocene time, based on calcareous nannofossil assemblages, isotopic indicators, and organic carbon content.<BR>During glacial stages several factors suggest that the Arabian Peninsula was <I>humid</I>, including a very high calculated rate of sedimentation based on oxygen isotope stratigraphy, several to ten times that of interglacial stages, and an increase in the absolute flux of fluvial sediments and variability of lithofacies. The Arabian Peninsula was separated by high mountains along its southwest margin from east Africa, which was <I>arid</I> during glacial stages.

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各種コード

  • NII論文ID(NAID)
    10002235400
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    4203642
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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