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

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DOI	10.5194/tc-9-691-2015
	Quantifying meltwater refreezing along a transect of sites on the Greenland ice sheet
	Cox C.; Humphrey N.; Harper J.
发表日期	2015
ISSN	19940416
卷号	9 期号:2
英文摘要	On the Greenland ice sheet, a significant quantity of surface meltwater 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. While we limit our method to a subsection of firn between depths of 1 and 10 m, our refreezing estimates appear to differ significantly from model-based estimates. Furthermore, results indicate that a significant amount of refreezing takes place at depths greater than 1 m and that lateral migration of meltwater significantly complicates the relationship between total surface melt and total refreezing. © Author(s) 2015.
学科领域	accumulation; firn; freezing; heat flux; in situ measurement; mass balance; meltwater; Monte Carlo analysis; quantitative analysis; runoff; spatiotemporal analysis; temperature profile; time series; transect; uncertainty analysis; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	accumulation; firn; freezing; heat flux; in situ measurement; mass balance; meltwater; Monte Carlo analysis; quantitative analysis; runoff; spatiotemporal analysis; temperature profile; time series; transect; uncertainty analysis; Arctic; Greenland; Greenland Ice Sheet
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/119919
作者单位	Department of Geology and Geophysics, University of Wyoming, Laramie, WY, United States; Department of Geosciences, University of Montana, 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 ice sheet[J],2015,9(2).
APA	Cox C.,Humphrey N.,&Harper J..(2015).Quantifying meltwater refreezing along a transect of sites on the Greenland ice sheet.Cryosphere,9(2).
MLA	Cox C.,et al."Quantifying meltwater refreezing along a transect of sites on the Greenland ice sheet".Cryosphere 9.2(2015).