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DOI	10.5194/tc-13-1843-2019
	Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements
	Marchenko S.; Cheng G.; Lötstedt P.; Pohjola V.; Pettersson R.; Van Pelt W.; Reijmer C.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1843
结束页码	1859
卷号	13 期号:7
英文摘要	Accurate description of snow and firn processes is necessary for estimating the fraction of glacier surface melt that contributes to runoff. Most processes in snow and firn are to a great extent controlled by the temperature therein and in the absence of liquid water, the temperature evolution is dominated by the conductive heat exchange. The latter is controlled by the effective thermal conductivity. Here we reconstruct the effective thermal conductivity of firn at Lomonosovfonna, Svalbard, using an optimization routine minimizing the misfit between simulated and measured subsurface temperatures and densities. The optimized values in the range from 0.2 to 1.6 W (m K)-1 increase downwards and over time. The results are supported by uncertainty quantification experiments, according to which is most sensitive to systematic errors in empirical temperature values and their estimated depths, particularly in the lower part of the vertical profile. Compared to commonly used density-based parameterizations, our values are consistently larger, suggesting a faster conductive heat exchange in firn. © 2019 Copernicus GmbH. All rights reserved.
学科领域	firn; glacier; measurement method; runoff; snow cover; thermal conductivity; vertical profile; Arctic; Lomonosovfonna; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	firn; glacier; measurement method; runoff; snow cover; thermal conductivity; vertical profile; Arctic; Lomonosovfonna; Spitsbergen; Svalbard; Svalbard and Jan Mayen
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118865
作者单位	Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Department of Information Technology, Uppsala University, Uppsala, Sweden; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Marchenko S.,Cheng G.,Lötstedt P.,et al. Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements[J],2019,13(7).
APA	Marchenko S..,Cheng G..,Lötstedt P..,Pohjola V..,Pettersson R..,...&Reijmer C..(2019).Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements.The Cryosphere,13(7).
MLA	Marchenko S.,et al."Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements".The Cryosphere 13.7(2019).