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

Liu, Yi and Lo, Li and Shi, Zhengguo and Wei, Kuo-Yen and Chou, Chien-Ju and Chen, Yi-Chi and Chuang, Chih-Kai and Wu, Chung-Che and Mii, Horng-Sheng and Peng, Zicheng and Amakawa, Hiroshi and Burr, George S. and Lee, Shih-Yu and DeLong, Kristine L. and Elderfield, Henry and Shen, Chuan-Chou (2015) Obliquity pacing of the western Pacific Intertropical Convergence Zone over the past 282,000 years. Nature Communications, 6. p. 10018. ISSN 2041-1723 DOI 10.1038/ncomms10018

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Official URL: http://www.nature.com/ncomms/2015/151125/ncomms100...

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.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA70; weekly list
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Nature Communications
Volume: 6
Page Range: p. 10018
Identification Number: 10.1038/ncomms10018
Depositing User: Sarah Humbert
Date Deposited: 17 Jan 2016 02:13
Last Modified: 27 Apr 2016 17:26
URI: http://eprints.esc.cam.ac.uk/id/eprint/3549

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