气候变化领域集成服务门户(CCPortal): Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream

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DOI	10.5194/tc-15-3119-2021
	Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream
	Zeising O.; Humbert A.
发表日期	2021
ISSN	19940416
起始页码	3119
结束页码	3128
卷号	15 期号:7
英文摘要	The accelerated ice flow of ice streams that reach far into the interior of the ice sheets is associated with lubrication of the ice sheet base by basal meltwater. However, the amount of basal melting under the large ice streams - such as the Northeast Greenland Ice Stream (NEGIS) - is largely unknown. In situ measurements of basal melt rates are important from various perspectives as they indicate the heat budget, the hydrological regime and the relative importance of sliding in glacier motion. The few previous estimates of basal melt rates in the NEGIS region were 0.1ma-1 and more, based on radiostratigraphy methods. These findings raised the question of the heat source, since even an increased geothermal heat flux could not deliver the necessary amount of heat. Here, we present basal melt rates at the recent deep drill site EastGRIP, located in the centre of NEGIS. Within 2 subsequent years, we found basal melt rates of 0.19±0.04ma-1 that are based on analysis of repeated phase-sensitive radar measurements. In order to quantify the contribution of processes that contribute to melting, we carried out an assessment of the energy balance at the interface and found the subglacial water system to play a key role in facilitating such high melt rates. © 2021 Ole Zeising.
英文关键词	basal melting; detection method; ice stream; Arctic; Greenland; Greenland Ice Sheet
语种	英语
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/202455
作者单位	Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Department of Geosciences, University of Bremen, Bremen, Germany
推荐引用方式 GB/T 7714	Zeising O.,Humbert A.. Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream[J],2021,15(7).
APA	Zeising O.,&Humbert A..(2021).Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream.Cryosphere,15(7).
MLA	Zeising O.,et al."Indication of high basal melting at the EastGRIP drill site on the Northeast Greenland Ice Stream".Cryosphere 15.7(2021).