DOI: 10.5194/cp-9-2579-2013
Scopus记录号: 2-s2.0-84887861531
论文题名: High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core
作者: Chappellaz J. ; Stowasser C. ; Blunier T. ; Baslev-Clausen D. ; Brook E.J. ; Dallmayr R. ; Faïn X. ; Lee J.E. ; Mitchell L.E. ; Pascual O. ; Romanini D. ; Rosen J. ; Schüpbach S.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 6 起始页码: 2579
结束页码: 2593
语种: 英语
Scopus关键词: Dansgaard-Oeschger cycle
; deglaciation
; dissolved oxygen
; glacial environment
; ice core
; interstadial
; methane
; resolution
; spectrometry
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based setting. We present the resulting atmospheric methane (CH4) record covering the time period from 107.7 to 9.5 ka b2k (thousand years before 2000 AD). Companion discrete CH4 measurements are required to transfer the laser spectroscopic data from a relative to an absolute scale. However, even on a relative scale, the high-resolution CH 4 data set significantly improves our knowledge of past atmospheric methane concentration changes. New significant sub-millennial-scale features appear during interstadials and stadials, generally associated with similar changes in water isotopic ratios of the ice, a proxy for local temperature. In addition to the midpoint of Dansgaard-Oeschger (D/O) CH4 transitions usually used for cross-dating, sharp definition of the start and end of these events brings precise depth markers (with ±20 cm uncertainty) for further cross-dating with other palaeo- or ice core records, e.g. speleothems. The method also provides an estimate of CH4 rates of change. The onsets of D/O events in the methane signal show a more rapid rate of change than their endings. The rate of CH4 increase associated with the onsets of D/O events progressively declines from 1.7 to 0.6 ppbv yr-1 in the course of marine isotope stage 3. The largest observed rate of increase takes place at the onset of D/O event #21 and reaches 2.5 ppbv yr-1. © 2013 Auhtor(s). 资助项目: SNSF, Swiss National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49345
Appears in Collections: 气候变化与战略
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Recommended Citation:
Chappellaz J.,Stowasser C.,Blunier T.,et al. High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core[J]. Climate of the Past,2013-01-01,9(6)