DOI: 10.5194/cp-12-1565-2016
Scopus记录号: 2-s2.0-84979656082
论文题名: Regional climate signal vs. local noise: A two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land
作者: Münch T. ; Kipfstuhl S. ; Freitag J. ; Meyer H. ; Laepple T.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 7 起始页码: 1565
结束页码: 1581
语种: 英语
Scopus关键词: climate signal
; climate variation
; firn
; Holocene
; ice core
; image processing
; isotopic composition
; paleoclimate
; reconstruction
; regional climate
; signal-to-noise ratio
; snow accumulation
; stable isotope
; water chemistry
; Antarctica
; East Antarctica
; Queen Maud Land
英文摘要: In low-accumulation regions, the reliability of δ18O-derived temperature signals from ice cores within the Holocene is unclear, primarily due to the small climate changes relative to the intrinsic noise of the isotopic signal. In order to learn about the representativity of single ice cores and to optimise future ice-core-based climate reconstructions, we studied the stable-water isotope composition of firn at Kohnen Station, Dronning Maud Land, Antarctica. Analysing δ18O in two 50 m long snow trenches allowed us to create an unprecedented, two-dimensional image characterising the isotopic variations from the centimetre to the 100-metre scale. Our results show seasonal layering of the isotopic composition but also high horizontal isotopic variability caused by local stratigraphic noise. Based on the horizontal and vertical structure of the isotopic variations, we derive a statistical noise model which successfully explains the trench data. The model further allows one to determine an upper bound for the reliability of climate reconstructions conducted in our study region at seasonal to annual resolution, depending on the number and the spacing of the cores taken. © 2016 Author(s). 资助项目: Helmholtz Association
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48989
Appears in Collections: 气候变化与战略
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Recommended Citation:
Münch T.,Kipfstuhl S.,Freitag J.,et al. Regional climate signal vs. local noise: A two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land[J]. Climate of the Past,2016-01-01,12(7)