DOI: 10.5194/cp-12-1979-2016
Scopus记录号: 2-s2.0-84992080678
论文题名: Climatic and insolation control on the high-resolution total air content in the NGRIP ice core
作者: Eicher O. ; Baumgartner M. ; Schilt A. ; Schmitt J. ; Schwander J. ; Stocker T.F. ; Fischer H.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 10 起始页码: 1979
结束页码: 1993
语种: 英语
英文摘要: Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC record is known to also contain an insolation signature, although the underlying physical mechanisms are still a matter of debate. Here we present a high-resolution TAC record over the whole North Greenland Ice Core Project ice core, covering the last 120 000 years, which independently supports an insolation signature in Greenland. Wavelet analysis reveals a clear precession and obliquity signal similar to previous findings on Antarctic TAC, with a different insolation history. In our high-resolution record we also find a decrease of 4-6% (4-5 mL kg-1) in TAC as a response to Dansgaard-Oeschger events (DO events). TAC starts to decrease in parallel to increasing Greenland surface temperature and slightly before CH4 reacts to the warming but also shows a two-step decline that lasts for several centuries into the warm interstadial. The TAC response is larger than expected considering only changes in air density by local temperature and atmospheric pressure as a driver, pointing to a transient firnification response caused by the accumulation-induced increase in the load on the firn at bubble close-off, while temperature changes deeper in the firn are still small. © Author(s) 2016. 资助项目: AWI, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
; NSF, National Science Foundation
; OPP, Office of Polar Programs
; SHF, Singapore Heart Foundation
; SNSF, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48967
Appears in Collections: 气候变化与战略
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Recommended Citation:
Eicher O.,Baumgartner M.,Schilt A.,et al. Climatic and insolation control on the high-resolution total air content in the NGRIP ice core[J]. Climate of the Past,2016-01-01,12(10)