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

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 L. DeLong, Henry Elderfield and Chuan-Chou Shen ()
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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
Li Lo: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
Zhengguo Shi: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of 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
George S. Burr: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
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

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms10018

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