globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116823
Late Miocene-Pliocene Asian summer monsoon variability linked to both tropical Pacific temperature and Walker Circulation
Author: Wang M.; Wang H.; Zhu Z.; Yang X.; Zhang K.; Zhang Y.; Liu W.; Zheng Z.; Zong Y.; Liu Z.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2021
Volume: 561
Language: 英语
keyword in Chinese: Asian summer monsoon ; Late Miocene-Pliocene ; sea surface temperature ; South China Sea ; Walker Circulation
Keyword: Atmospheric thermodynamics ; Oceanography ; Surface waters ; Asian summer monsoons ; Controlling mechanism ; Multiple biomarkers ; Sea surface temperature (SST) ; Temperature changes ; Tropical temperatures ; Walker circulation ; Warmer conditions ; Tropics ; Miocene ; mixing ; monsoon ; paleoclimate ; Pliocene ; sea surface temperature ; upwelling ; Walker circulation ; Pacific Ocean ; Pacific Ocean (Tropical) ; South China Sea
English Abstract: The Pliocene climate, characterized by sustained global warmth and weakened Walker Circulation, might be a potential analogue of our future climate. How Asian Summer Monsoon (ASM) evolved over this period and its controlling mechanisms remain controversial, which limits our understanding of future monsoon behavior. Here, we present alkenone- and GDGT-based records reconstructed from the northern coast of the South China Sea, interpreted to document the strength of ASM-induced upwelling/mixing effect, to infer Late Miocene-Pliocene ASM variability. Cooler local sea surface temperatures occurred between ∼5.6 million years ago (Ma) and 4.3 Ma, corresponding to Pliocene warmer conditions, effectively capturing the cooling signal induced by summer upwelling. Our multiple biomarker records consistently indicate three phases of Late Miocene-Pliocene ASM evolution: weak ASM strength at ∼6.5–5.6 Ma, substantially enhanced strength at 5.6–4.3 Ma, and reduced strength but with a slightly strengthening trend after ∼4.3 Ma. The three features have been reported collectively from previous terrestrial and marine records. The close correspondence of the ASM strength to tropical temperature before ∼4.3 Ma suggests a dominant tropical temperature control, whereas the increasing ASM strength after that, opposite to temperature changes, implies that the developed Walker Circulation started to influence ASM strength over the Late Pliocene. Hence, tropical temperature and Walker Circulation appear to have exerted competing roles in the Late Miocene-Pliocene ASM evolution. © 2021 Elsevier B.V.
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Affiliation: School of Marine Sciences, Sun Yat-Sen University, Zhuhai, 519082, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China; Department of Earth Sciences, The University of Hong KongHong Kong SAR, Hong Kong; School of Earth Science and Engineering, Sun Yat-Sen University, Zhuhai, 519082, China

Recommended Citation:
Wang M.,Wang H.,Zhu Z.,et al. Late Miocene-Pliocene Asian summer monsoon variability linked to both tropical Pacific temperature and Walker Circulation[J]. Earth and Planetary Science Letters,2021-01-01,561
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