title: Obliquity pacing of the western Pacific Intertropical Convergence Zone over the past 282,000 years.
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.
authors.affiliation: CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China.|High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.|State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Li
authors.initials: L
authors.lastname: Lo
authors.affiliation: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China.|CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China.
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Shi
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Kuo-Yen
authors.initials: KY
authors.lastname: Wei
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Chien-Ju
authors.initials: CJ
authors.lastname: Chou
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Yi-Chi
authors.initials: YC
authors.lastname: Chen
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Chih-Kai
authors.initials: CK
authors.lastname: Chuang
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Chung-Che
authors.initials: CC
authors.lastname: Wu
authors.affiliation: Department of Earth Sciences, National Taiwan Normal University, Taipei 11677, Taiwan ROC.
authors.forename: Horng-Sheng
authors.initials: HS
authors.lastname: Mii
authors.affiliation: CAS Key Laboratory of Crust-Mantle Material and Environment, School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Zicheng
authors.initials: Z
authors.lastname: Peng
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Amakawa
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.|Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: George S
authors.initials: GS
authors.lastname: Burr
authors.affiliation: Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan ROC.
authors.forename: Shih-Yu
authors.initials: SY
authors.lastname: Lee
authors.affiliation: Department of Geography and Anthropology, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: Kristine L
authors.identifier: http://orcid.org/0000-0001-6320-421X
authors.initials: KL
authors.lastname: DeLong
authors.affiliation: Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK.
authors.forename: Henry
authors.initials: H
authors.lastname: Elderfield
authors.affiliation: High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan ROC.
authors.forename: Chuan-Chou
authors.initials: CC
authors.lastname: Shen