globalchange  > 气候变化与战略
DOI: 10.1029/2019PA003796
Late Quaternary East Asian Summer Monsoon Variability Deduced From Lacustrine Mineral Magnetic Records of Dahu Swamp, Southern China
Author: Wei Z.; Zhong W.; Xue J.; Ouyang J.; Shang S.; Ye S.; Cao J.; Li M.
Source Publication: Paleoceanography and Paleoclimatology
ISSN: 25724517
Publishing Year: 2020
Volume: 35, Issue:2
Language: 英语
Keyword: Dahu Swamp ; East Asian summer monsoon (EASM) ; ENSO modes ; hydroclimatic changes ; mineral magnetism
Scopus Keyword: catchment ; heterogeneity ; hydrometeorology ; monsoon ; precipitation (climatology) ; Quaternary ; rainfall ; spatiotemporal analysis ; summer ; China ; Citrus maxima
English Abstract: The lack of long-term and well-preserved terrestrial archives from southern China largely impedes our understanding of past variability in the East Asian summer monsoon (EASM). In this study, we developed rainfall/precipitation-related records by conducting a systematic mineral-magnetic investigation on Dahu Swamp sediments over the past ~47.0 ka. The integrated magnetic results show that the magnetic minerals in the sediments were mainly catchment derived, likely reflecting hydroclimatic changes associated with EASM strength. In combination with other climatic proxies, our magnetic records reveal a relatively wet climate during the middle-late Marine Oxygen Isotope Stage 3 and the Holocene and a relatively dry climate during the Marine Oxygen Isotope Stage 2, which broadly follow the precession-induced summer insolation changes in the middle-low latitudes of the Northern Hemisphere. The regional heterogeneity of the EASM rainfall evolution might be ascribed to the changes in timing and duration of Mei-yu Front in China, which were closely associated with the El Niño/Southern Oscillation activities through its effects on the Western Pacific Subtropical High position. Long-term climatic patterns inferred from Dahu Swamp were broadly similar to those of the Western Pacific Warm Pool region, especially during the mid-Holocene rainfall optimum period, further supporting that the thermal mean states of the tropical Pacific associated with El Niño/Southern Oscillation modes may influence EASM precipitation. Our results highlight the coupled influence of external insolation forcing and internal low-latitude processes on the spatial and temporal EASM variability, and understanding these influences could be critical to the prediction of future monsoon behavior under ongoing and future global warming. ©2020. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
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Affiliation: School of Geography Sciences, South China Normal University, Guangzhou, China; Zhuhai branch of State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Zhuhai, China; School of Tourism, Henan Normal University, Xinxiang, China

Recommended Citation:
Wei Z.,Zhong W.,Xue J.,et al. Late Quaternary East Asian Summer Monsoon Variability Deduced From Lacustrine Mineral Magnetic Records of Dahu Swamp, Southern China[J]. Paleoceanography and Paleoclimatology,2020-01-01,35(2)
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