4.8 Article

Evolution of vegetation and climate variability on the Tibetan Plateau over the past 1.74 million years

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SCIENCE ADVANCES
卷 6, 期 19, 页码 -

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AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay6193

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资金

  1. National Natural Science Foundation of China [41690113, 41888101, 41330105]
  2. National Key Research and Development Program of China [2016YFA0600501]
  3. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA20070101]
  4. Natural Environment Research Council [NE/R000204/1]
  5. European Research Council [741413]
  6. VISTA (Norwegian Academy of Science and Letters and Equinor) project IGNEX-eco [6166]
  7. NERC [NE/R000204/1] Funding Source: UKRI

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The Tibetan Plateau exerts a major influence on Asian climate, but its long-term environmental history remains largely unknown. We present a detailed record of vegetation and climate changes over the past 1.74 million years in a lake sediment core from the Zoige Basin, eastern Tibetan Plateau. Results show three intervals with different orbital- and millennial-scale features superimposed on a stepwise long-term cooling trend. The interval of 1.74-1.54 million years ago is characterized by an insolation-dominated mode with strong similar to 20,000-year cyclicity and quasi-absent millennial-scale signal. The interval of 1.54-0.62 million years ago represents a transitional insolation-ice mode marked by similar to 20,000- and similar to 40,000-year cycles, with superimposed millennial-scale oscillations. The past 620,000 years are characterized by an ice-driven mode with 100,000-year cyclicity and less frequent millennial-scale variability. A pronounced transition occurred 620,000 years ago, as glacial cycles intensified. These new findings reveal how the interaction of low-latitude insolation and high-latitude ice-volume forcing shaped the evolution of the Tibetan Plateau climate.

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