DOI: 10.5194/tc-9-691-2015
Scopus记录号: 2-s2.0-84928168439
论文题名: Quantifying meltwater refreezing along a transect of sites on the Greenland ice sheet
作者: Cox C ; , Humphrey N ; , Harper J
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 2 起始页码: 691
结束页码: 701
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75317
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Cox C,, Humphrey N,, Harper J. Quantifying meltwater refreezing along a transect of sites on the Greenland ice sheet[J]. Cryosphere,2015-01-01,9(2)