A 15year record of frontal glacier ablation rates estimated from seismic data

Kohler Andreas; Nuth Christopher; Kohler JackBerthier EtienneWeidle ChristianSchweitzer Johannes

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A 15year record of frontal glacier ablation rates estimated from seismic data

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We present a unique time series of continuous glacier frontal ablation rates with weekly resolution over 15years estimated from seismic calving observations at Kronebreen, Svalbard. Using linear statistical models, we calibrate the seismic record with 7years of satellite-derived frontal ablation measurements. The two basic input parameters required for our models are the cumulative duration of individual seismic calving events and the incompleteness of the seismic record to correct for the effect of seismic background noise. Frontal ablation follows the seasonal glacier speedup, peaking 1-2months after the melt season maximum. Short-lived peaks are associated with melt and rain events. Cumulative frontal ablation of Kronebreen between 2001 and 2015 is about 4.0km(3)(3.7Gt), with the greatest annual loss (0.45km(3)) between 2013 and 2014 at the onset of the recent accelerated retreat of the glacier. Our approach provides a potential method for monitoring tidewater glaciers worldwide that have sufficiently close seismic instrumentation.

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来源
《Geophysical Research Letters》 |2016年第23期|12155-12164|共10页
作者
Kohler Andreas; Nuth Christopher; Kohler JackBerthier EtienneWeidle ChristianSchweitzer Johannes;
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作者单位

Univ Oslo, Dept Geosci, Oslo, Norway;

Norwegian Polar Res Inst, Polar Environm Ctr, Tromso, Norway;

Univ Toulouse, CNRS, LEGOS, CNES,IRD,UPS, Toulouse, FranceUniv Kiel, Inst Geosci, Kiel, Germany;

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原文格式 PDF
正文语种英语
中图分类地球物理学;
关键词
calving; frontal ablation; seismic monitoring; Svalbard; tidewater glacier;

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A 15year record of frontal glacier ablation rates estimated from seismic data

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