气候变化领域集成服务门户(CCPortal): A continuum model for meltwater flow through compacting snow

CCPortal

DOI	10.5194/tc-11-2799-2017
	A continuum model for meltwater flow through compacting snow
	Meyer C.R.; Hewitt I.J.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Melt water is produced on the surface of glaciers and ice sheets when the seasonal energy forcing warms the snow to its melting temperature. This meltwater percolates into the snow and subsequently runs off laterally in streams, is stored as liquid water, or refreezes, thus warming the subsurface through the release of latent heat. We present a continuum model for the percolation process that includes heat conduction, meltwater percolation and refreezing, as well as mechanical compaction. The model is forced by surface mass and energy balances, and the percolation process is described using Darcy's law, allowing for both partially and fully saturated pore space. Water is allowed to run off from the surface if the snow is fully saturated. The model outputs include the temperature, density, and water-content profiles and the surface runoff and water storage. We compare the propagation of freezing fronts that occur in the model to observations from the Greenland Ice Sheet. We show that the model applies to both accumulation and ablation areas and allows for a transition between the two as the surface energy forcing varies. The largest average firn temperatures occur at intermediate values of the surface forcing when perennial water storage is predicted. © Author(s) 2017.
学科领域	compaction; Darcy law; freezing; glacial hydrology; glacier; heat transfer; hydrological modeling; ice sheet; latent heat flux; melting; meltwater; percolation; runoff; seasonal variation; snow; temperature profile; warming; water flow; water storage
语种	英语
scopus关键词	compaction; Darcy law; freezing; glacial hydrology; glacier; heat transfer; hydrological modeling; ice sheet; latent heat flux; melting; meltwater; percolation; runoff; seasonal variation; snow; temperature profile; warming; water flow; water storage
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/119296
作者单位	John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; Mathematical Institute, Woodstock Road, Oxford, OX26GG, United Kingdom
推荐引用方式 GB/T 7714	Meyer C.R.,Hewitt I.J.. A continuum model for meltwater flow through compacting snow[J],2017,11(6).
APA	Meyer C.R.,&Hewitt I.J..(2017).A continuum model for meltwater flow through compacting snow.Cryosphere,11(6).
MLA	Meyer C.R.,et al."A continuum model for meltwater flow through compacting snow".Cryosphere 11.6(2017).