气候变化领域集成服务门户(CCPortal): Quantifying meltwater refreezing along a transect of sites on the Greenland Icesheet

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DOI	10.5194/tcd-8-5485-2014
	Quantifying meltwater refreezing along a transect of sites on the Greenland Icesheet
	Cox C.; Humphrey N.; Harper J.
发表日期	2014
ISSN	19940432
卷号	8 期号:5
英文摘要	On the Greenland ice sheet, a significant quantity of surface melt water refreezes within the firn creating uncertainty in surface mass balance estimates. This refreezing has the potential to buffer seasonal runoff to future increases in melting, but direct measurement of the process remains difficult. We present a method for quantifying refreezing at point locations using in situ firn temperature observations. A time series of sub-hourly firn temperature profiles were collected over the course of two melt seasons from 2007 to 2009 along a transect of 11 sites in the accumulation zone of Greenland. Seasonal changes in temperature profiles combined with heat flux estimates based on high temporal resolution temperature gradients, enable us to isolate the heat released by refreezing using conservation of energy. Our method is verified from winter data when no refreezing takes place, and uncertainty is estimated using a monte carlo technique. Results provide additional evidence of a significant amount of refreezing taking place at depths greater than 1 m and that runoff begins to occur above the ELA. Near the runoff limit, lateral migration of melt water significantly complicates the relationship between total surface melt and total refreezing. © Author(s) 2014.
学科领域	cryosphere; firn; freezing; heat flux; ice sheet; meltwater; runoff; temperature profile; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	cryosphere; firn; freezing; heat flux; ice sheet; meltwater; runoff; temperature profile; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Cryosphere Discussions
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120039
作者单位	Department of Geology and Geophysics, Laramie, WY, United States; Department of Geosciences, Missoula, MT, United States
推荐引用方式 GB/T 7714	Cox C.,Humphrey N.,Harper J.. Quantifying meltwater refreezing along a transect of sites on the Greenland Icesheet[J],2014,8(5).
APA	Cox C.,Humphrey N.,&Harper J..(2014).Quantifying meltwater refreezing along a transect of sites on the Greenland Icesheet.Cryosphere Discussions,8(5).
MLA	Cox C.,et al."Quantifying meltwater refreezing along a transect of sites on the Greenland Icesheet".Cryosphere Discussions 8.5(2014).