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Intensification of the East Asian winter monsoon during the late Miocene
编号：1529 访问权限：仅限参会人 更新：2026-09-01 01:14:36 浏览：0次 张贴报告

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摘要
The late Miocene (~11.6–5.3 million years ago) represents a key interval within the long-term Cenozoic cooling trend toward the Pleistocene ice ages. During this time, drastic climatic and ecological changes occurred in both terrestrial and marine environments. The most spectacular landscape change was probably the spread of C4 grasslands at the expense of C3-dominated ecosystems in large areas of the tropics and subtropics. Here we present upper ocean hydrographic reconstructions, i.e., the depth of the mixed layer, at Ocean Drilling Program (ODP) Site 1146 in the northern South China Sea during the late Miocene (~8–6.5 Ma). Surface/mixed layer and thermocline water temperatures were reconstructed using Mg/Ca-derived temperature estimates of surface/mixed layer-dwelling planktic foraminifera species Trilobatus sacculifer and Globigerinoides extremus and the thermocline-dwelling planktic foraminifera species Neogloboquadrina acostaensis, respectively, in order to estimate the upper ocean thermal gradient (ΔT). The upper ocean thermal gradient (ΔT) allows to study changes in the upper surface water column structure, i.e., mixed layer depth (MLD) and thus EAM wind strength variability. The reconstructed ΔT(˚C) between surface/mixed-layer dwelling planktic foraminifera T. sacculifer and G. extremus and thermocline-dwelling planktic foraminifera species N. acostaensis reveal a deeper mixing and a less stratified water column after ~7.5 Ma, most likely indicating a strengthening of the East Asian winter monsoon (EAWM).
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报告人
Yu Ma
Xiamen University

稿件作者
Yu Ma Xiamen University
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重要日期

  • 会议日期

    01月12日

    2027

    至

    01月15日

    2027

  • 07月21日 2026

    初稿截稿日期

  • 01月15日 2027

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University (MEL)
Department of Earth Sciences, National Natural Science Foundation of China (NSFC)
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