Continued obliquity pacing of East Asian summer precipitation after the mid-Pleistocene transition

Tao Li, Fei Liu, Hemmo A. Abels, Chen Feng You, Zeke Zhang, Jun Chen, Junfeng Ji, Laifeng Li, Le Li, Hou Chun Liu, Chao Ren, Renyuan Xia, Liang Zhao, Wenfang Zhang, Gaojun Li

研究成果: Article

17 引文 斯高帕斯(Scopus)

摘要

Records from natural archives show that the strength of the East Asian summer monsoon (EASM) strongly depends on the orbital configuration of the Earth. However, the dominant orbital cycles driving EASM have been found to be spatially different. Speleothem stable oxygen isotopic records from southern China, which are believed to reflect large-scale changes in the Asian monsoon system, are dominated by climatic precession cycles. Further north, on the Chinese Loess Plateau (CLP), loess-and-paleosol sequences, which are argued to be controlled by monsoon intensity, are in pace with global ice volume changes dominated by obliquity, and after the mid-Pleistocene transition by 100-kyr cycles. To understand these critical discrepancies, here we apply a novel proxy based on the trace metal compositions of pedogenic carbonate in the eolian deposits on the CLP to reconstruct summer precipitation over the last 1.5 million years. Our reconstructions show that summer precipitation on the CLP is dominantly forced by obliquity not in pace with the ice-volume-imprinted loess-paleosol sequences before and after the mid-Pleistocene transition or with the precession-paced speleothem oxygen isotopic records. Coupled with climate model results, we suggest that the obliquity-driven variations of summer precipitation may originate from the gradient of boreal insolation that modulates the thermal contrast between the Asian continent and surrounding oceans.

原文English
頁(從 - 到)181-190
頁數10
期刊Earth and Planetary Science Letters
457
DOIs
出版狀態Published - 2017 一月 1

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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    Li, T., Liu, F., Abels, H. A., You, C. F., Zhang, Z., Chen, J., Ji, J., Li, L., Li, L., Liu, H. C., Ren, C., Xia, R., Zhao, L., Zhang, W., & Li, G. (2017). Continued obliquity pacing of East Asian summer precipitation after the mid-Pleistocene transition. Earth and Planetary Science Letters, 457, 181-190. https://doi.org/10.1016/j.epsl.2016.09.045