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Tytuł:
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Early Pleistocene pollen record from the western Chinese Loess Plateau and its implications for the evolution of the East Asian Summer Monsoon.
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Autorzy:
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Hui Z; College of Environment and Planning, Henan University, Kaifeng 475004, China; National Demonstration Center for Environmental and Planning, Henan University, Kaifeng 475004, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China.
Ran M; College of Environment and Planning, Henan University, Kaifeng 475004, China; National Demonstration Center for Environmental and Planning, Henan University, Kaifeng 475004, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China. Electronic address: .
Li H; College of Environment and Planning, Henan University, Kaifeng 475004, China; National Demonstration Center for Environmental and Planning, Henan University, Kaifeng 475004, China.
Liu C; College of Environment and Planning, Henan University, Kaifeng 475004, China; National Demonstration Center for Environmental and Planning, Henan University, Kaifeng 475004, China.
Guo B; Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Zhang J; Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China. Electronic address: .
Peng T; Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Liu D; College of Environment and Planning, Henan University, Kaifeng 475004, China; National Demonstration Center for Environmental and Planning, Henan University, Kaifeng 475004, China.
Pan Y; College of Environment and Planning, Henan University, Kaifeng 475004, China; National Demonstration Center for Environmental and Planning, Henan University, Kaifeng 475004, China.
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Źródło:
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The Science of the total environment [Sci Total Environ] 2021 Mar 20; Vol. 761, pp. 143304. Date of Electronic Publication: 2020 Nov 04.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Amsterdam, Elsevier.
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MeSH Terms:
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Asian People*
Pollen*
Asia ; China ; Humans ; Seasons
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Contributed Indexing:
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Keywords: Early Pleistocene; East Asian Summer Monsoon; Loess; Pollen; Temperature gradient; Western Chinese Loess Plateau
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Entry Date(s):
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Date Created: 20201120 Date Completed: 20210122 Latest Revision: 20221207
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Update Code:
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20240105
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DOI:
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10.1016/j.scitotenv.2020.143304
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PMID:
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33213915
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The East Asian Summer Monsoon (EASM) is the most important and active atmospheric circulation system in Asia. However, its evolution during the Early Pleistocene, and that evolution's associated drivers, remain controversial. Here, for the first time, a high resolution pollen record was obtained from a loess-paleosol sequence located in the Lanzhou Basin, western Chinese Loess Plateau (CLP), and used to reconstruct the evolution of EASM intensity during the Early Pleistocene (2.2-1.7 Ma). The type of vegetation indicated by analysis of the pollen assemblage is comparable to the forest-steppe vegetation type currently distributed on the eastern CLP. This area's present-day mean annual temperature (MAT) and mean annual precipitation (MAP) are ~6-10 °C and ~400-550 mm, respectively, implying the existence of a stronger EASM intensity during the 2.2-1.7 Ma period. When the auxiliary function of the diversity index was applied, the Early Pleistocene EASM, as recorded by the vegetation successions identified within the loess-paleosol sequence, showed a generally stronger intensity during the 2.2-2.06 Ma period, a relatively weak intensity between 2.06 Ma and 1.97 Ma, and then a gradual intensification from 1.97 Ma until 1.7 Ma. Further comparisons demonstrated that the zonal thermal gradient in the Equatorial Pacific may have played an important role in driving the evolution of the EASM over a tectonic timescale during the Early Pleistocene. In contrast, over a sub-orbital or orbital timescale, the EASM intensity appears to have been closely correlated to global temperature variations, given that the MATs of the Early Pleistocene were higher than today's. This would imply that both low-latitude forcing and global temperature change were important drivers influencing variations in precipitation in Northern China, against a background of ongoing global warming.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
