气候变化领域集成服务门户(CCPortal): Ground-penetrating radar reveals ice thickness and undisturbed englacial layers at Kilimanjaro's Northern Ice Field

CCPortal

DOI	10.5194/tc-11-469-2017
	Ground-penetrating radar reveals ice thickness and undisturbed englacial layers at Kilimanjaro's Northern Ice Field
	Bohleber P.; Sold L.; Hardy D.R.; Schwikowski M.; Klenk P.; Fischer A.; Sirguey P.; Cullen N.J.; Potocki M.; Hoffmann H.; Mayewski P.
发表日期	2017
ISSN	19940416
卷号	11 期号:1
英文摘要	Although its Holocene glacier history is still subject to debate, the ongoing iconic decline of Kilimanjaro's largest remaining ice body, the Northern Ice Field (NIF), has been documented extensively based on surface and photogrammetric measurements. The study presented here adds, for the first time, ground-penetrating radar (GPR) data at centre frequencies of 100 and 200 MHz to investigate bed topography, ice thickness and internal stratigraphy at NIF. The direct comparison of the GPR signal to the visible glacier stratigraphy at NIF's vertical walls is used to validate ice thickness and reveals that the major internal reflections seen by GPR can be associated with dust layers. Internal reflections can be traced consistently within our 200 MHz profiles, indicating an uninterrupted, spatially coherent internal layering within NIF's central flat area. We show that, at least for the upper 30 m, it is possible to follow isochrone layers between two former NIF ice core drilling sites and a sampling site on NIF's vertical wall. As a result, these isochrone layers provide constraints for future attempts at linking age-depth information obtained from multiple locations at NIF. The GPR profiles reveal an ice thickness ranging between (6.1 ± 0.5) and (53.5 ± 1.0) m. Combining these data with a very high resolution digital elevation model we spatially extrapolate ice thickness and give an estimate of the total ice volume remaining at NIF's southern portion as (12.0 ± 0.3) × 106 m3. © 2017 Author(s).
学科领域	digital elevation model; englacial process; ground penetrating radar; ground-based measurement; Holocene; ice core; ice thickness; photogrammetry; spatial resolution; Kilimanjaro [Kilimanjaro (RGA)]; Kilimanjaro [Tanzania]; Tanzania
语种	英语
scopus关键词	digital elevation model; englacial process; ground penetrating radar; ground-based measurement; Holocene; ice core; ice thickness; photogrammetry; spatial resolution; Kilimanjaro [Kilimanjaro (RGA)]; Kilimanjaro [Tanzania]; Tanzania
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/119441
作者单位	Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany; Climate Change Institute, University of Maine, Orono, ME, United States; Institute for Interdisciplinary Mountain Research, Austrian Academy of Sciences, Innsbruck, Austria; Department of Geosciences, University of Fribourg, Fribourg, Switzerland; Climate System Research Center and Department of Geosciences, University of Massachusetts Amherst, Amherst, United States; Paul Scherrer Institute, Villigen, Switzerland; School of Earth and Climate Sciences, University of Maine, Orono, ME, United States; National School of Surveying, University of Otago, New Zealand; Department of Geography, University of Otago, New Zealand; German Aerospace Center (DLR) Oberpfaffenhofen, Germany
推荐引用方式 GB/T 7714	Bohleber P.,Sold L.,Hardy D.R.,et al. Ground-penetrating radar reveals ice thickness and undisturbed englacial layers at Kilimanjaro's Northern Ice Field[J],2017,11(1).
APA	Bohleber P..,Sold L..,Hardy D.R..,Schwikowski M..,Klenk P..,...&Mayewski P..(2017).Ground-penetrating radar reveals ice thickness and undisturbed englacial layers at Kilimanjaro's Northern Ice Field.Cryosphere,11(1).
MLA	Bohleber P.,et al."Ground-penetrating radar reveals ice thickness and undisturbed englacial layers at Kilimanjaro's Northern Ice Field".Cryosphere 11.1(2017).