Evolution of vegetation and climate variability on the Tibetan Plateau over the past 1.74 million years
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. Resul...
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| Veröffentlicht in: | Science advances 2020-05, Vol.6 (19), p.eaay6193 |
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| creator | Zhao, Yan Tzedakis, Polychronis C Li, Quan Qin, Feng Cui, Qiaoyu Liang, Chen Birks, H John B Liu, Yaoliang Zhang, Zhiyong Ge, Junyi Zhao, Hui Felde, Vivian A Deng, Chenglong Cai, Maotang Li, Huan Ren, Weihe Wei, Haicheng Yang, Hanfei Zhang, Jiawu Yu, Zicheng Guo, Zhengtang |
| description | 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 ~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 ~20,000- and ~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. |
| doi_str_mv | 10.1126/sciadv.aay6193 |
| format | Article |
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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 ~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 ~20,000- and ~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.</description><identifier>ISSN: 2375-2548</identifier><identifier>EISSN: 2375-2548</identifier><identifier>DOI: 10.1126/sciadv.aay6193</identifier><identifier>PMID: 32494698</identifier><language>eng</language><publisher>United States: American Association for the Advancement of Science</publisher><subject>Agriculture ; Climatology ; SciAdv r-articles</subject><ispartof>Science advances, 2020-05, Vol.6 (19), p.eaay6193</ispartof><rights>Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).</rights><rights>Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. 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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 ~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 ~20,000- and ~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. 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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 ~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 ~20,000- and ~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.</abstract><cop>United States</cop><pub>American Association for the Advancement of Science</pub><pmid>32494698</pmid><doi>10.1126/sciadv.aay6193</doi><orcidid>https://orcid.org/0000-0002-2855-0894</orcidid><orcidid>https://orcid.org/0000-0002-2458-4544</orcidid><orcidid>https://orcid.org/0000-0002-4569-2915</orcidid><orcidid>https://orcid.org/0000-0003-1848-3170</orcidid><orcidid>https://orcid.org/0000-0003-2259-9715</orcidid><orcidid>https://orcid.org/0000-0002-5891-9859</orcidid><orcidid>https://orcid.org/0000-0001-6072-1166</orcidid><orcidid>https://orcid.org/0000-0003-1693-9795</orcidid><orcidid>https://orcid.org/0000-0001-8621-6467</orcidid><orcidid>https://orcid.org/0000-0001-9824-3315</orcidid><orcidid>https://orcid.org/0000-0003-2358-2712</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Agriculture Climatology SciAdv r-articles |
| title | Evolution of vegetation and climate variability on the Tibetan Plateau over the past 1.74 million years |
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