DOI: 10.5194/cp-9-749-2013
Scopus记录号: 2-s2.0-84881141089
论文题名: Direct linking of Greenland and Antarctic ice cores at the Toba eruption (74 ka BP)
作者: Svensson A. ; Bigler M. ; Blunier T. ; Clausen H.B. ; Dahl-Jensen D. ; Fischer H. ; Fujita S. ; Goto-Azuma K. ; Johnsen S.J. ; Kawamura K. ; Kipfstuhl S. ; Kohno M. ; Parrenin F. ; Popp T. ; Rasmussen S.O. ; Schwander J. ; Seierstad I. ; Severi M. ; Steffensen J.P. ; Udisti R. ; Uemura R. ; Vallelonga P. ; Vinther B.M. ; Wegner A. ; Wilhelms F. ; Winstrup M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 2 起始页码: 749
结束页码: 766
语种: 英语
Scopus关键词: cooling
; decadal variation
; geomagnetic field
; ice core
; interstadial
; isotope
; paleoenvironment
; tephra
; volcanic eruption
; Arctic
; Greater Sunda Islands
; Greenland
; Sumatra
; Sunda Isles
英文摘要: The Toba eruption that occurred some 74 ka ago in Sumatra, Indonesia, is among the largest volcanic events on Earth over the last 2 million years. Tephra from this eruption has been spread over vast areas in Asia, where it constitutes a major time marker close to the Marine Isotope Stage 4/5 boundary. As yet, no tephra associated with Toba has been identified in Greenland or Antarctic ice cores. Based on new accurate dating of Toba tephra and on accurately dated European stalagmites, the Toba event is known to occur between the onsets of Greenland interstadials (GI) 19 and 20. Furthermore, the existing linking of Greenland and Antarctic ice cores by gas records and by the bipolar seesaw hypothesis suggests that the Antarctic counterpart is situated between Antarctic Isotope Maxima (AIM) 19 and 20. In this work we suggest a direct synchronization of Greenland (NGRIP) and Antarctic (EDML) ice cores at the Toba eruption based on matching of a pattern of bipolar volcanic spikes. Annual layer counting between volcanic spikes in both cores allows for a unique match. We first demonstrate this bipolar matching technique at the already synchronized Laschamp geomagnetic excursion (41 ka BP) before we apply it to the suggested Toba interval. The Toba synchronization pattern covers some 2000 yr in GI-20 and AIM- 19/20 and includes nine acidity peaks that are recognized in both ice cores. The suggested bipolar Toba synchronization has decadal precision. It thus allows a determination of the exact phasing of inter-hemispheric climate in a time interval of poorly constrained ice core records, and it allows for a discussion of the climatic impact of the Toba eruption in a global perspective. The bipolar linking gives no support for a long-term global cooling caused by the Toba eruption as Antarctica experiences a major warming shortly after the event. Furthermore, our bipolar match provides a way to place palaeoenvironmental records other than ice cores into a precise climatic context. © Author(s) 2013. 资助项目: NSF, National Science Foundation
; ESF, European Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49430
Appears in Collections: 气候变化与战略
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Recommended Citation:
Svensson A.,Bigler M.,Blunier T.,et al. Direct linking of Greenland and Antarctic ice cores at the Toba eruption (74 ka BP)[J]. Climate of the Past,2013-01-01,9(2)