DOI: 10.1016/j.quascirev.2016.10.021
Scopus记录号: 2-s2.0-84995783641
论文题名: Holocene moisture and East Asian summer monsoon evolution in the northeastern Tibetan Plateau recorded by Lake Qinghai and its environs: A review of conflicting proxies
作者: Chen F. ; Wu D. ; Chen J. ; Zhou A. ; Yu J. ; Shen J. ; Wang S. ; Huang X.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 154 起始页码: 111
结束页码: 129
语种: 英语
英文关键词: EASM evolution
; Lake Qinghai
; Middle Holocene EASM maximum
; Northeastern Tibetan Plateau
Scopus关键词: Atmospheric thermodynamics
; Climate change
; Moisture
; Sediments
; Asian summer monsoons
; EASM evolution
; East Asian summer monsoon
; Holocenes
; Lake Qinghai
; Monsoon precipitation
; Northeastern tibetan plateaux
; Precipitation reconstruction
; Lakes
; climate variation
; core analysis
; deposition
; fossil record
; global climate
; Holocene
; lacustrine deposit
; moisture
; monsoon
; ostracod
; paleoclimate
; palynology
; pollen
; precipitation (climatology)
; proxy climate record
; speleothem
; China
; Gonghe Basin
; Qaidam Basin
; Qinghai
; Qinghai Lake Basin
; Qinghai-Xizang Plateau
; Ostracoda
英文摘要: Climatic and environmental changes in the northeastern Tibetan Plateau are controlled by the Asian summer monsoon (ASM) and the westerlies, two key circulation components of the global climate system which directly affect a large human population and associated ecosystems in eastern Asia. During the past few decades, a series of Holocene palaeoclimatic records have been obtained from sediment cores from Lake Qinghai and from various other geological archives in the surrounding area of the northeastern Tibetan Plateau. However, because of uncertainties regarding the sediment chronologies and the climatic significance of the proxies used, the nature of Holocene climatic changes in the region remains unclear and even controversial. Here we review all major classes of the published data from drilled cores from Lake Qinghai, as well as other evidence from lakes and aeolian deposits from surrounding areas, in order to reconstruct changes in moisture patterns and possible summer monsoon evolution in the area during the Holocene. Combining the results of moisture and precipitation proxies such as vegetation history, pollen-based precipitation reconstruction, aeolian activity, lake water depth/lake level changes, salinity and sediment redness, we conclude that moisture and precipitation began to increase in the early Holocene, reached their maximum during the middle Holocene, and decreased during the late Holocene - similar to the pattern of the East Asian summer monsoon (EASM) in northern China. It is clear that the region experienced a relatively dry climate and weak EASM during the early Holocene, as indicated by relatively low tree pollen percentages and fluctuating pollen concentrations; generally low lake levels of Lake Qinghai and the adjacent Lake Hurleg and Lake Toson in the Qaidam Basin; and widely distributed aeolian sand deposition in the Lake Qinghai Basin and the nearby Gonghe Basin to the south, and in the eastern Qaidam Basin to the west. We argue that the ostracod δ18O record, which is widely used as a proxy of effective moisture and summer monsoon intensity in lake sediments, at least in Lake Qinghai, and which exhibits light values in the early Holocene and heavier values thereafter, cannot be used to reflect the strength of the EASM or the intensity of monsoon precipitation - as is also the case for leaf wax δ2H records. Rather, we argue that as is the case of the Chinese speleothem δ18O record, which also is often interpreted as an EASM proxy, it reflects variation in the δ18O of precipitation. Overall, we suggest that the EASM significantly affected precipitation in the northeastern Tibetan Plateau during the Holocene; and that it increased in strength during the early Holocene, reached a maximum during the middle Holocene and decreased during the late Holocene. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59369
Appears in Collections: 过去全球变化的重建
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作者单位: College of Earth and Environmental Sciences, MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou, China; Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China; Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, United States
Recommended Citation:
Chen F.,Wu D.,Chen J.,et al. Holocene moisture and East Asian summer monsoon evolution in the northeastern Tibetan Plateau recorded by Lake Qinghai and its environs: A review of conflicting proxies[J]. Quaternary Science Reviews,2016-01-01,154