DOI: 10.1016/j.quascirev.2017.06.006
论文题名: Coherent tropical-subtropical Holocene see-saw moisture patterns in the Eastern Hemisphere monsoon systems
作者: Wang Y. ; Bekeschus B. ; Handorf D. ; Liu X. ; Dallmeyer A. ; Herzschuh U.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 169 起始页码: 231
结束页码: 242
语种: 英语
英文关键词: Eastern hemisphere
; Global monsoon
; Holocene
; Moisture evolution
Scopus关键词: Meteorology
; Moisture
; Tropics
; Eastern hemisphere
; Fuzzy C means clustering
; Global monsoon
; Holocenes
; Intertropical convergence zone
; Paleoclimate records
; Precipitation deficits
; Spatial distribution patterns
; Atmospheric thermodynamics
; cluster analysis
; conceptual framework
; fuzzy mathematics
; global climate
; Holocene
; ice core
; late glacial
; moisture content
; monsoon
; paleoclimate
; spatial analysis
; spatial distribution
英文摘要: The concept of a Global Monsoon (GM) has been proposed based on modern precipitation observations, but its application over a wide range of temporal scales is still under debate. Here, we present a synthesis of 268 continental paleo-moisture records collected from monsoonal systems in the Eastern Hemisphere, including the East Asian Monsoon (EAsM), the Indian Monsoon (IM), the East African Monsoon (EAfM), and the Australian Monsoon (AuM) covering the last 18,000 years. The overall pattern of late Glacial to Holocene moisture change is consistent with those inferred from ice cores and marine records. With respect to the last 10,000 years (10 ka), i.e. a period that has high spatial coverage, a Fuzzy c-Means clustering analysis of the moisture index records together with “Xie-Beni” index reveals four clusters of our data set. The paleoclimatic meaning of each cluster is interpreted considering the temporal evolution and spatial distribution patterns. The major trend in the tropical AuM, EAfM, and IM regions is a gradual decrease in moisture conditions since the early Holocene. Moisture changes in the EAsM regions show maximum index values between 8 and 6 ka. However, records located in nearby subtropical areas, i.e. in regions not influenced by the intertropical convergence zone, show an opposite trend compared to the tropical monsoon regions (AuM, EAfM and IM), i.e. a gradual increase. Analyses of modern meteorological data reveal the same spatial patterns as in the paleoclimate records such that, in times of overall monsoon strengthening, lower precipitation rates are observed in the nearby subtropical areas. We explain this pattern as the effect of a strong monsoon circulation suppressing air uplift in nearby subtropical areas, and hence hindering precipitation. By analogy to the modern system, this would mean that during the early Holocene strong monsoon period, the intensified ascending airflows within the monsoon domains led to relatively weaker ascending or even descending airflows in the adjacent subtropical regions, resulting in a precipitation deficit compared to the late Holocene. Our conceptual model therefore integrates regionally contrasting moisture changes into the Global Monsoon hypothesis. © 2017 Elsevier Ltd 资助项目: Wang, Y.
; Beijing Key Laboratory of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, West 3rd Ring North Road 105, China
; 电子邮件: ywang2015@163.com
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59180
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred-Wegener-Institut Helmholtz Centre for Polar and Marine Research in the Helmholtz Association, Research Unit Potsdam, Potsdam, Germany; Beijing Key Laboratory of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing, China; Institute of Earth and Environmental Science, University of Potsdam, Potsdam, Germany; Max Planck Institute for Meteorology, Bundesstraße 53, Hamburg, Germany
Recommended Citation:
Wang Y.,Bekeschus B.,Handorf D.,et al. Coherent tropical-subtropical Holocene see-saw moisture patterns in the Eastern Hemisphere monsoon systems[J]. Quaternary Science Reviews,2017-01-01,169