DOI: 10.1016/j.quascirev.2015.01.032
Scopus记录号: 2-s2.0-84924227352
论文题名: Late Pleistocene-Holocene vegetation and Indian summer monsoon record from the Lahaul, Northwest Himalaya, India
作者: Rawat S. ; Gupta A.K. ; Sangode S.J. ; Srivastava P. ; Nainwal H.C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 114 起始页码: 167
结束页码: 181
语种: 英语
英文关键词: Carbon isotopes
; Himalaya
; Indian summer monsoon
; Little Ice Age
; Medieval Warm Period
; Palynology
Scopus关键词: Atmospheric thermodynamics
; Carbon
; Glacial geology
; Isotopes
; Lakes
; Landforms
; Peat
; Plants (botany)
; Vegetation
; Wind
; Carbon isotopes
; Himalayas
; Indian summer monsoon
; Little Ice Age
; Medieval Warm Period
; Palynology
; Organic carbon
; carbon isotope
; lacustrine deposit
; meadow
; paleoclimate
; palynology
; Pleistocene-Holocene boundary
; total organic carbon
; vegetation history
; Himachal Pradesh
; India
; Lahaul Valley
; Pir Panjal Range
; Alnus nepalensis
; Artemisia
; Betula utilis
; Caryophyllaceae
; Cedrus
; Juglans regia
; Liliaceae
; Poaceae
; Polygonum
; Quercus
; Ulmus
英文摘要: The high resolution Holocene paleomonsoon records from Northwest (NW) Himalaya are limited. The carbon isotope (δ13C), Total organic carbon (TOC) and pollen analysis were therefore carried out from a peat-lake sediment sequence developed in alpine meadows of the Chandra valley, Lahaul, NW Himalaya, in order to reconstruct centennial to millennial scale vegetational changes and Indian summer monsoon (ISM) variability during the Holocene. The chronology of peat-lake sediments is constrained with 9 AMS 14C dates. The recovered non-arboreal pollen (NAP) suggested that during Holocene alpine desert-steppe, meadows and shrubs growing along the stream had developed in the Lahaul valley whereas arboreal pollens (AP) e.g. Pinus, Quercus, Cedrus and Ulmus presently growing in the southern hill slopes of Pir Panjal range indicated moisture carrying monsoonal air flow from the South. The increased δ13C and low TOC values between ~12,880 and 11,640 calibrated years before present (calyrBP) suggested weakening of ISM and low organic carbon production corresponding to the Younger Dryas (YD) cold event. The gradual depletion in carbon isotope ratio from ~11,640 to 8810calyrBP indicated enhanced precipitation in the Chandra valley in response of increased ISM strength in early Holocene. The short spell of cold and dry climate with gradual decrease in ISM intensity between ca10,398 and 9778calyrBP is closely linked with Bond event-7. The other prominent cold-dry events recorded in present study are (i) ~8810 to 8117calyrBP roughly corresponding to global 8.2ka cold event, (ii) ~4808 to 4327calyrBP closely preceding the global 4.2ka cold-arid period, and (iii) ~1303 to 1609calAD corresponding to Little Ice Age (LIA) event. The expansion of thermophillous broad leaved taxa viz. Betula utilis, Alnus nepalensis, Quercus semicarpifolia and Juglans regia and effective growth of meadow vegetation such as grasses, Caryophyllaceae and Artemisia along with marshy elements i.e. Polygonum and Liliaceae between ~6732 and 3337calyrBP marked warm and wet Holocene climate optimum (HCO) period. The warm and moist climate from ~1158-647calyrBP corresponded with global Medieval Warm Period (MWP). © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59961
Appears in Collections: 过去全球变化的重建
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作者单位: Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, India; Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, India; Department of Geology, Savitribai Phule Pune University, Pune, India; Department of Geology, H.N.B. Garhwal Central University, Srinagar, India; School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Recommended Citation:
Rawat S.,Gupta A.K.,Sangode S.J.,et al. Late Pleistocene-Holocene vegetation and Indian summer monsoon record from the Lahaul, Northwest Himalaya, India[J]. Quaternary Science Reviews,2015-01-01,114