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Obliquity pacing of the western Pacific Intertropical Convergence Zone over the past 282,000 years

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  • Yi Liu

    (CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Science, University of Science and Technology of China
    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
    State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences)

  • Li Lo

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
    Present address: Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK)

  • Zhengguo Shi

    (State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences
    CAS Center for Excellence in Tibetan Plateau Earth Sciences)

  • Kuo-Yen Wei

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Chien-Ju Chou

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Yi-Chi Chen

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Chih-Kai Chuang

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Chung-Che Wu

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Horng-Sheng Mii

    (National Taiwan Normal University)

  • Zicheng Peng

    (CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Science, University of Science and Technology of China)

  • Hiroshi Amakawa

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
    Present address: Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 2370061, Japan)

  • George S. Burr

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
    University of Arizona)

  • Shih-Yu Lee

    (Research Center for Environmental Changes, Academia Sinica)

  • Kristine L. DeLong

    (Louisiana State University)

  • Henry Elderfield

    (University of Cambridge)

  • Chuan-Chou Shen

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

Abstract

The Intertropical Convergence Zone (ITCZ) encompasses the heaviest rain belt on the Earth. Few direct long-term records, especially in the Pacific, limit our understanding of long-term natural variability for predicting future ITCZ migration. Here we present a tropical precipitation record from the Southern Hemisphere covering the past 282,000 years, inferred from a marine sedimentary sequence collected off the eastern coast of Papua New Guinea. Unlike the precession paradigm expressed in its East Asian counterpart, our record shows that the western Pacific ITCZ migration was influenced by combined precession and obliquity changes. The obliquity forcing could be primarily delivered by a cross-hemispherical thermal/pressure contrast, resulting from the asymmetric continental configuration between Asia and Australia in a coupled East Asian–Australian circulation system. Our finding suggests that the obliquity forcing may play a more important role in global hydroclimate cycles than previously thought.

Suggested Citation

  • Yi Liu & Li Lo & Zhengguo Shi & Kuo-Yen Wei & Chien-Ju Chou & Yi-Chi Chen & Chih-Kai Chuang & Chung-Che Wu & Horng-Sheng Mii & Zicheng Peng & Hiroshi Amakawa & George S. Burr & Shih-Yu Lee & Kristine , 2015. "Obliquity pacing of the western Pacific Intertropical Convergence Zone over the past 282,000 years," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms10018
    DOI: 10.1038/ncomms10018
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