气候变化领域集成服务门户(CCPortal): Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements

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DOI	10.5194/tc-13-3117-2019
	Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements
	Köhler A.; Pȩtlicki M.; Lefeuvre P.-M.; Buscaino G.; Nuth C.; Weidle C.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	3117
结束页码	3137
卷号	13 期号:11
英文摘要	Frontal ablation contributes significantly to the mass balance of tidewater glaciers in Svalbard and can be recovered with high temporal resolution using continuous seismic records. Determination of the relative contribution of dynamic ice loss through calving to frontal ablation requires precise estimates of calving volumes at the same temporal resolution. We combine seismic and hydroacoustic observations close to the calving front of Kronebreen, a marine-terminating glacier in Svalbard, with repeat lidar scanning of the glacier front. Simultaneous time-lapse photography is used to assign volumes measured from lidar scans to seismically detected calving events. Empirical models derived from signal properties such as integrated amplitude are able to replicate volumes of individual calving events and cumulative subaerial ice loss over different lidar scan intervals from seismic and hydroacoustic data alone. This enables quantification of the contribution of calving to frontal ablation, which we estimate for Kronebreen to be about 18%-30%, slightly below the subaerially exposed area of the glacier front. We further develop a model calibrated for the permanent seismic Kings Bay station (KBS) at about 15km distance from the glacier front, where 15%-60% of calving events can be detected under variable noise conditions due to reduced signal amplitudes at distance. Between 2007 and 2017, we find a 5%-30% contribution of calving ice blocks to frontal ablation, which emphasizes the importance of underwater melting (roughly 4-9md-1). This study shows the feasibility to seismically monitor not only frontal ablation rates but also the dynamic ice loss contribution continuously and at high temporal resolution. © 2019 Copernicus GmbH. All rights reserved.
学科领域	ablation; acoustic survey; amplitude; glacier mass balance; lidar; mass balance; photogrammetry; photography; signal processing; Arctic; Florida [United States]; Kings Bay [Florida]; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen; United States
语种	英语
scopus关键词	ablation; acoustic survey; amplitude; glacier mass balance; lidar; mass balance; photogrammetry; photography; signal processing; Arctic; Florida [United States]; Kings Bay [Florida]; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen; United States
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118805
作者单位	NORSAR, Kjeller, 2007, Norway; Department of Geosciences, University of Oslo, Post Box 1047, Oslo, 0316, Norway; Centro de Estudios Científicos, Valdivia, Chile; CNR, Anthropic Impacts and Sustainable Marine Environment Institute, Capo Granitola, Torretta Granitola, Italy; Institute of Geosciences, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
推荐引用方式 GB/T 7714	Köhler A.,Pȩtlicki M.,Lefeuvre P.-M.,et al. Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements[J],2019,13(11).
APA	Köhler A.,Pȩtlicki M.,Lefeuvre P.-M.,Buscaino G.,Nuth C.,&Weidle C..(2019).Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements.The Cryosphere,13(11).
MLA	Köhler A.,et al."Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements".The Cryosphere 13.11(2019).