Holocene palynological records and their responses to the controversies of climate system in the Shiyang River drainage basin |
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Authors: | Li Yu Wang NaiAng Li ZhuoLun Zhang HuaAn |
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Institution: | LI Yu*,WANG NaiAng,LI ZhuoLun & ZHANG HuaAn College of Earth and Environmental Sciences,Center for Hydrologic Cycle and Water Resources in Arid Region,Lanzhou University,Lanzhou 730000,China |
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Abstract: | The Shiyang River drainage basin is located in the northwest margin of the Asian monsoon region. Previous studies reached
different conclusions about Holocene climatic changes in the basin. Some studies suggested the Holocene climatic changes were
mainly controlled by the Asian monsoon and that the climate was relatively humid during the early Holocene (11.6–7.1 cal ka
BP). Other studies found the mid-Holocene Climatic Optimum (7.0–5.0 cal ka BP), and this climate condition was similar to
the Holocene westerly wind pattern in arid Central Asia. The modern climate is affected by the Asian monsoon and westerly
wind in the drainage basin, and the Holocene climatic records showed two different Holocene climatic patterns—a westerly wind
pattern and monsoonal pattern. However, it remains unclear what caused the two different Holocene climatic patterns to co-exist
in the region. The palynological records are the main evidence for the Holocene climatic changes in the basin. This paper
focuses on palynological records for different parts of the drainage basin. Among them, QTH02, QTL-03 and Sanjiaocheng records
are located in the terminal lake, and the Hongshuihe record is located in the middle reaches of the basin. In the terminal
lake, the palynological records of QTH02 and QTL-03 are similar, but the Sanjiaocheng record differs. The difference is mainly
affected by the variable pollen assemblages in the different locations of the lake basin. From comparison and synthesis of
the four palynological records, we concluded that the millennial-scale Holocene climatic changes were affected by the combined
effects of the Asian monsoon and westerly wind in the drainage basin, which show the complicated Holocene climatic pattern
in the northwest margin of the Asian monsoon. |
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Keywords: | Holocene Asian monsoon westerly wind pattern marginal area of the Asian monsoon palynological records |
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