气候变化领域集成服务门户(CCPortal): Surface Melting Drives Fluctuations in Airborne Radar Penetration in West Central Greenland

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DOI	10.1029/2020GL088293
	Surface Melting Drives Fluctuations in Airborne Radar Penetration in West Central Greenland
	Otosaka I.N.; Shepherd A.; Casal T.G.D.; Coccia A.; Davidson M.; Di Bella A.; Fettweis X.; Forsberg R.; Helm V.; Hogg A.E.; Hvidegaard S.M.; Lemos A.; Macedo K.; Kuipers Munneke P.; Parrinello T.; Simonsen S.B.; Skourup H.; Sørensen L.S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:17
英文摘要	Greenland Ice Sheet surface melting has increased since the 1990s, affecting the rheology and scattering properties of the near-surface firn. We combine firn cores and modeled firn densities with 7 years of CryoVEx airborne Ku-band (13.5 GHz) radar profiles to quantify the impact of melting on microwave radar penetration in West Central Greenland. Although annual layers are present in the Ku-band radar profiles to depths up to 15 m below the ice sheet surface, fluctuations in summer melting strongly affect the degree of radar penetration. The extreme melting in 2012, for example, caused an abrupt 6.2 ± 2.4 m decrease in Ku-band radar penetration. Nevertheless, retracking the radar echoes mitigates this effect, producing surface heights that agree to within 13.9 cm of coincident airborne laser measurements. We also examine 2 years of Ka-band (34.5 GHz) airborne radar data and show that the degree of penetration is half that of coincident Ku-band. ©2020. The Authors.
英文关键词	Digital storage; Glaciers; Melting; Radar; Airborne lasers; Degree of penetration; Greenland Ice Sheet; Microwave radars; Radar profiles; Scattering property; Surface height; Surface melting; Radar measurement; airborne survey; ground penetrating radar; ice sheet; melting; microwave radiation; radar altimetry; rheology; wave scattering; Arctic; Greenland; Greenland Ice Sheet
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169821
作者单位	Centre for Polar Observation and Modelling, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; ESA-ESTEC, Noordwijk, Netherlands; Metasensing, Noordwijk, Netherlands; Technical University of Denmark, DTU Space, Lyngby, Denmark; University of Liège, Liège, Belgium; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Now at University of Gothenburg, Göteborg, Sweden; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; ESA-ESRIN, Frascati, Italy
推荐引用方式 GB/T 7714	Otosaka I.N.,Shepherd A.,Casal T.G.D.,et al. Surface Melting Drives Fluctuations in Airborne Radar Penetration in West Central Greenland[J],2020,47(17).
APA	Otosaka I.N..,Shepherd A..,Casal T.G.D..,Coccia A..,Davidson M..,...&Sørensen L.S..(2020).Surface Melting Drives Fluctuations in Airborne Radar Penetration in West Central Greenland.Geophysical Research Letters,47(17).
MLA	Otosaka I.N.,et al."Surface Melting Drives Fluctuations in Airborne Radar Penetration in West Central Greenland".Geophysical Research Letters 47.17(2020).