DOI: 10.1016/j.quascirev.2015.02.002
Scopus记录号: 2-s2.0-84924023903
论文题名: A ~50ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas
作者: Ghosh R. ; Bera S. ; Sarkar A. ; Paruya D.K. ; Yao Y.-F. ; Li C.-S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 114 起始页码: 100
结束页码: 115
语种: 英语
英文关键词: Darjeeling foothill
; Eastern Himalayas
; Monsoon variation
; Plant community
; ~50ka
Scopus关键词: Carbon dioxide
; Conservation
; Forestry
; Darjeeling foothill
; Himalayas
; Monsoon variation
; Plant communities
; ~50ka
; Plants (botany)
; climate variation
; coexistence
; Last Glacial Maximum
; monsoon
; paleoclimate
; precipitation (climatology)
; Climates
; Mountains
; Plants
; Darjeeling
; India
; West Bengal
; Asteraceae
; Poaceae
英文摘要: Pollen, phytoliths and δ 13C signatures of soil organic matter from two fluvial sedimentary sequences of the Darjeeling foothill region, eastern Himalayas are used to portray palaeoclimatic oscillations and their impact on regional plant communities over the last ~50ka. Quantitative palaeoclimate estimation using coexistence approach on pollen data and other proxies indicate significant oscillations in precipitation during the late part of MIS 3 (46.4-25.9ka), early and middle part of MIS 2 (25.9-15.6ka), and 5.4 to 3.5ka. Middle to late MIS 3 (ca46.4-31ka.) was characterized by a comparatively low monsoonal activity and slightly higher temperature than that during ca31ka onwards. Simultaneous expansion of deciduous trees and chloridoid grasses also imply a drier and warmer phase. Between 31 and 22.3ka (late MIS 3 to mid-MIS 2), higher precipitation and a slightly cooler temperature led to an increase in evergreen elements over deciduous taxa and wet-loving panicoid grasses over dry-loving chloridoid grasses than earlier. After ca 22.3ka, shrinking of forest cover, expansion of C4 chloridoid grasses, Asteraceae and Cheno-ams in the vegetation with lowering of temperature and precipitation characterized the onset of the LGM which continued till 18.3ka. End of the LGM is manifested by a restoration in the forest cover and in the temperature and precipitation regime. Later, during 5.4 to 4.3ka, a strong monsoonal activity supported a dense moist evergreen forest cover that subsequently declined during 4.3 to 3.5ka. A further increase in deciduous elements and non-arboreals might be a consequence of reduced precipitation and higher temperature during this phase. A comparison between monsoonal rainfall, MAT and palaeoatmospheric CO2 with floral dynamics since last ~50ka indicates that these fluctuations in plant succession were mainly driven by monsoonal variations. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59964
Appears in Collections: 过去全球变化的重建
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作者单位: Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow, India; Centre of Advanced Study, Palaeobotany-Palynology Laboratory, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, India; Department of Geology and Geophysics, Indian Institute of Technology, IIT Kharagpur, Kharagpur, India; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Ghosh R.,Bera S.,Sarkar A.,et al. A ~50ka record of monsoonal variability in the Darjeeling foothill region, eastern Himalayas[J]. Quaternary Science Reviews,2015-01-01,114