globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116758
Title:
Holocene variability of East Asian summer monsoon as viewed from the speleothem δ18O records in central China
Author: Cai Y.; Cheng X.; Ma L.; Mao R.; Breitenbach S.F.M.; Zhang H.; Xue G.; Cheng H.; Edwards R.L.; An Z.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2021
Volume: 558
Language: 英语
keyword in Chinese: central China ; East Asian summer monsoon ; Holocene ; stable isotopes ; stalagmite ; variability
Keyword: Agricultural robots ; Atmospheric thermodynamics ; Glacial geology ; Oceanography ; Spatial distribution ; Surface waters ; Time series analysis ; Tropics ; Wavelet decomposition ; Agricultural practices ; East Asian summer monsoon ; Ensemble empirical mode decompositions (EEMD) ; Monsoon precipitation ; Northern Hemispheres ; Sea surface temperature (SST) ; Spatiotemporal variability ; Stable-isotope analysis ; Climate change ; Holocene ; monsoon ; oxygen isotope ; paleoclimate ; speleothem ; stable isotope ; stalagmite ; summer ; China
English Abstract: Monsoon precipitation in East China shows distinct spatial distribution and its variability is closely linked with the changes of the East Asian summer monsoon (EASM). Located in the transition zone between the southern subtropical humid climate and the northern warm temperate semi-humid climate, central China is a core region for recognizing and understanding the spatio-temporal variability of the EASM. Using U-series dating and stable isotope analysis on five stalagmites (MG-1, MG-2, MG-7, MG-40 and MG-64) from Magou Cave, Henan Province, Central China, we construct a high-resolution and precisely dated composite stalagmite δ18O time series covering most of the Holocene. This composite record reveals variations in precipitation δ18O between 11.7 and 1.1 ka BP with average resolution of ∼4 yrs. The Magou composite record demonstrates that EASM intensity dominates long-term changes in precipitation δ18O, which generally follows the northern hemisphere summer insolation (NHSI) trend. Both, Ensemble Empirical Mode Decomposition (EEMD) and wavelet filtering analyses real that the amplitudes of long-term (100-500 and 500-3000 yrs) components were slightly reduced between 8.5 and 4.9 ka BP, implying a weakened influence of climatic forcings on centennial and even millennial timescales during this warm period. Variance on 1-30-yr timescales is relatively low and ascribed to sampling resolution. Fourteen weak EASM intervals, including the 8.2 ka event, were identified within the period corresponding broadly with the Holocene Megathermal. Since no cold excursions other than the 8.2 ka event are found in the Greenland ice core records, we tentatively propose that oscillations in tropical sea surface temperature (SST) likely play an important role in steering other weak monsoon events. Aligning the Magou composite record and other moisture records with archaeological records from the study region, it seems that climate change influenced both the spatial distribution and agricultural practices of ancient cultures. However, overall moderate climatic changes in this region, most likely characterized by shifts between subtropical humid climate and warm temperate semi-humid climate, supported a generally consecutive development of ancient cultures without major hiatuses. © 2021 Elsevier B.V.
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Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/165420
Appears in Collections:气候变化与战略

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Affiliation: State Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Science, Xi'an, 710061, China; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049, China; Open Studio for OCCEC, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geography and Environmental Sciences, Northumbria UniversityNE1 8ST, United Kingdom; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States

Recommended Citation:
Cai Y.,Cheng X.,Ma L.,et al. Holocene variability of East Asian summer monsoon as viewed from the speleothem δ18O records in central China[J]. Earth and Planetary Science Letters,2021-01-01,558
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