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DOI	10.5194/tc-11-1075-2017
	Location and distribution of micro-inclusions in the EDML and NEEM ice cores using optical microscopy and in situ Raman spectroscopy
	Eichler J.; Kleitz I.; Bayer-Giraldi M.; Jansen D.; Kipfstuhl S.; Shigeyama W.; Weikusat C.; Weikusat I.
发表日期	2017
ISSN	19940416
卷号	11 期号:3
英文摘要	Impurities control a variety of physical properties of polar ice. Their impact can be observed at all scales - from the microstructure (e.g., grain size and orientation) to the ice sheet flow behavior (e.g., borehole tilting and closure). Most impurities in ice form micrometer-sized inclusions. It has been suggested that these μ inclusions control the grain size of polycrystalline ice by pinning of grain boundaries (Zener pinning), which should be reflected in their distribution with respect to the grain boundary network. We used an optical microscope to generate high-resolution large-scale maps (3 μmpix-1, 8×2 cm2) of the distribution of micro-inclusions in four polar ice samples: two from Antarctica (EDML, MIS 5.5) and two from Greenland (NEEM, Holocene). The in situ positions of more than 5000 μ inclusions have been determined. A Raman microscope was used to confirm the extrinsic nature of a sample proportion of the mapped inclusions. A superposition of the 2-D grain boundary network and μ-inclusion distributions shows no significant correlations between grain boundaries and μ inclusions. In particular, no signs of grain boundaries harvesting μ inclusions could be found and no evidence of μ inclusions inhibiting grain boundary migration by slow-mode pinning could be detected. Consequences for our understanding of the impurity effect on ice microstructure and rheology are discussed. © Author(s) 2017.
学科领域	flow pattern; grain boundary; ice core; ice sheet; microscopy; microstructure; physical property; polar region; Raman spectroscopy; rheology; sheet flow; Antarctica; Arctic; Greenland; Azadirachta indica
语种	英语
scopus关键词	flow pattern; grain boundary; ice core; ice sheet; microscopy; microstructure; physical property; polar region; Raman spectroscopy; rheology; sheet flow; Antarctica; Arctic; Greenland; Azadirachta indica
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119402
作者单位	Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27568, Germany; Department of Geosciences, Eberhard Karls University Tübingen, Tübingen, 72074, Germany; Department of Polar Science, SOKENDAI, Graduate University for Advanced Studies, 10-3 Midori-cho, Tachikawa, Tokyo, 190-8518, Japan; National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo, 190-8518, Japan
推荐引用方式 GB/T 7714	Eichler J.,Kleitz I.,Bayer-Giraldi M.,et al. Location and distribution of micro-inclusions in the EDML and NEEM ice cores using optical microscopy and in situ Raman spectroscopy[J],2017,11(3).
APA	Eichler J..,Kleitz I..,Bayer-Giraldi M..,Jansen D..,Kipfstuhl S..,...&Weikusat I..(2017).Location and distribution of micro-inclusions in the EDML and NEEM ice cores using optical microscopy and in situ Raman spectroscopy.Cryosphere,11(3).
MLA	Eichler J.,et al."Location and distribution of micro-inclusions in the EDML and NEEM ice cores using optical microscopy and in situ Raman spectroscopy".Cryosphere 11.3(2017).