DOI: 10.5194/cp-8-1497-2012
Scopus记录号: 2-s2.0-84867482490
论文题名: Stable isotope and trace element investigation of two contemporaneous annually-laminated stalagmites from northeastern China surrounding the 8.2 ka event
作者: Wu J.Y. ; Wang Y.J. ; Cheng H. ; Kong X.G. ; Liu D.B.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 5 起始页码: 1497
结束页码: 1507
语种: 英语
Scopus关键词: dating method
; environmental change
; geochronology
; GRIP
; lamination
; oxygen isotope
; paleoclimate
; rainfall
; stable isotope
; stalagmite
; trace element
; westerly
; Atlantic Ocean
; Atlantic Ocean (North)
; China
; Dongge Cave
; Guizhou
; Liaoning
; Oman
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: The prominent "8.2 ka event" was well documented in the Greenland ice cores. It remains unclear, however, about its duration, structure and forcing mechanism at low-to mid-latitude regions. Here we use the physical and geochemical data of stalagmites from the Nuanhe Cave in Liaoning Province, northeastern China, to reconstruct a detailed history of East Asian monsoons covering the entire duration of the event. High-resolution chronologies of two contemporaneous stalagmites, each consisting of at least 770 yr annual growth bands, were established by calibrating and anchoring the floating band-counting ages against five high-precision 230Th dates. Two oxygen isotope profiles replicate each other on annual-decadal timescales despite their difference in growth rates, indicating that the δ18O variability has a climatic origin largely associated with changes in the rainfall δ18O from the West Pacific during summer season. A signal from the "8.2ka event" was faint in our δ18O records, not as significant as Indian monsoon dominated stalagmite δ18O records from Qunf in Oman and Dongge in Southern China. However, our δ13C and Ba/Ca profiles, as indicators of local environmental changes, provide strong support for a climate reversal centred at 8.2 ka BP, which is likely controlled by winter monsoon circulations via the westerly winds associated with North Atlantic climate. Therefore, we concluded that the winter-and summer-Asian monsoons responded independently to the high northern latitude climate. © 2012 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49559
Appears in Collections: 气候变化与战略
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Recommended Citation:
Wu J.Y.,Wang Y.J.,Cheng H.,et al. Stable isotope and trace element investigation of two contemporaneous annually-laminated stalagmites from northeastern China surrounding the 8.2 ka event[J]. Climate of the Past,2012-01-01,8(5)