气候变化领域集成服务门户(CCPortal): Snow Topography on Undeformed Arctic Sea Ice Captured by an Idealized “Snow Dune” Model

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DOI	10.1029/2019JC016034
	Snow Topography on Undeformed Arctic Sea Ice Captured by an Idealized “Snow Dune” Model
	Popović P.; Finkel J.; Silber M.C.; Abbot D.S.
发表日期	2020
ISSN	21699275
卷号	125 期号:9
英文摘要	Our ability to predict the future of Arctic sea ice is limited by ice's sensitivity to detailed surface conditions such as the distribution of snow and melt ponds. Snow on top of the ice decreases ice's thermal conductivity, increases its reflectivity (albedo), and provides a source of meltwater for melt ponds during summer that decrease the ice's albedo. In this paper, we develop a simple model of premelt snow topography that accurately describes snow cover of flat, undeformed Arctic sea ice on several study sites for which data were available. The model considers a surface that is a sum of randomly sized and placed “snow dunes” represented as Gaussian mounds. This model generalizes the “void model” of Popović et al. (2018, https://doi.org/10.1103/PhysRevLett.120.148701) and, as such, accurately describes the statistics of melt pond geometry. We test this model against detailed LiDAR measurements of the premelt snow topography. We show that the model snow depth distribution is statistically indistinguishable from the measurements on flat ice, while small disagreement exists if the ice is deformed. We then use this model to determine analytic expressions for the conductive heat flux through the ice and for melt pond coverage evolution during an early stage of pond formation. We also formulate a criterion for ice to remain pond-free throughout the summer. Results from our model could be directly included in large-scale models, thereby improving our understanding of energy balance on sea ice and allowing for more reliable predictions of Arctic sea ice in a future climate. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Arctic; heat conduction; melt ponds; sea ice; snow; stochastic modeling
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186702
作者单位	Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States; Committee on Computational and Applied Mathematics, University of Chicago, Chicago, IL, United States; Department of Statistics, University of Chicago, Chicago, IL, United States
推荐引用方式 GB/T 7714	Popović P.,Finkel J.,Silber M.C.,等. Snow Topography on Undeformed Arctic Sea Ice Captured by an Idealized “Snow Dune” Model[J],2020,125(9).
APA	Popović P.,Finkel J.,Silber M.C.,&Abbot D.S..(2020).Snow Topography on Undeformed Arctic Sea Ice Captured by an Idealized “Snow Dune” Model.Journal of Geophysical Research: Oceans,125(9).
MLA	Popović P.,et al."Snow Topography on Undeformed Arctic Sea Ice Captured by an Idealized “Snow Dune” Model".Journal of Geophysical Research: Oceans 125.9(2020).