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.
ASJC Scopus subject areas
- 化學 (全部)
- 生物化學、遺傳與分子生物學 (全部)
- 物理與天文學 (全部)
指紋深入研究「Obliquity pacing of the western Pacific Intertropical Convergence Zone over the past 282,000 years」主題。共同形成了獨特的指紋。
Age model and Nd/Ca ratio of planktonic foraminifera from sediment core MD05-2925 off the Solomon Sea
Wu, C. (Contributor), Wei, K. (Contributor), Liu, Y. (Contributor), Chuang, C. (Contributor), Chou, C. (Contributor), Mii, H. (Contributor), Burr, G. S. (Contributor), Lee, S. (Contributor), Shi, Z. (Contributor), Amakawa, H. (Contributor), Peng, Z. (Contributor), Chen, Y. (Contributor), Lo, L. (Contributor), Delong, K. L. (Contributor), Shen, C. (Contributor) & Elderfield, H. (Contributor), Unknown Publisher, 2015 十一月 25