Eccentricity-paced monsoon variability on the northeastern Tibetan Plateau in the Late Oligocene high CO2 world

Ao, H. et al. (2021) Eccentricity-paced monsoon variability on the northeastern Tibetan Plateau in the Late Oligocene high CO2 world. Science Advances, 7(51), eabk2318. (doi: 10.1126/sciadv.abk2318) (PMID:34910508) (PMCID:PMC8673770)

Abstract

Constraining monsoon variability and dynamics in the warm unipolar icehouse world of the Late Oligocene can provide important clues to future climate responses to global warming. Here, we present a ~4-thousand year (ka) resolution rubidium-to-strontium ratio and magnetic susceptibility records between 28.1 and 24.1 million years ago from a distal alluvial sedimentary sequence in the Lanzhou Basin (China) on the northeastern Tibetan Plateau margin. These Asian monsoon precipitation records exhibit prominent short (~110-ka) and long (405-ka) eccentricity cycles throughout the Late Oligocene, with a weak expression of obliquity (41-ka) and precession (19-ka and 23-ka) cycles. We conclude that a combination of eccentricity-modulated low-latitude summer insolation and glacial-interglacial Antarctic Ice Sheet fluctuations drove the eccentricity-paced precipitation variability on the northeastern Tibetan Plateau in the Late Oligocene high CO2 world by governing regional temperatures, water vapor loading in the western Pacific and Indian Oceans, and the Asian monsoon intensity and displacement.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Jonell, Dr Tara
• Authors: Ao, H., Liebrand, D., Dekkers, M. J., Zhang, P., Song, Y., Liu, Q., Jonell, T. N., Sun, Q., Li, X., Li, X., Qiang, X., and An, Z.
• College/School: College of Science and Engineering > School of Geographical and Earth Sciences
• Journal Name: Science Advances
• Publisher: American Association for the Advancement of Science
• ISSN: 2375-2548
• ISSN (Online): 2375-2548
• Published Online: 15 December 2021
• Copyright Holders: Copyright © 2021 The Authors
• First Published: First published in Science Advances 7(51): eabk2318
• Publisher Policy: Reproduced under a Creative Commons License
• Data DOI: 10.12262/IEECAS.EAPSD2021003