气候变化领域集成服务门户(CCPortal): Permafrost thermal conditions are sensitive to shifts in snow timing

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DOI	10.1088/1748-9326/ab8ec4
	Permafrost thermal conditions are sensitive to shifts in snow timing
	Jan A.; Painter S.L.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	Changes in snow precipitation at high latitudes can significantly affect permafrost thermal conditions and thaw depth, potentially exposing more carbon-laden soil to microbial decomposition. A fully coupled process-based surface/subsurface thermal hydrology model with surface energy balance is used to analyze the impact of intra-annual variability in snow on permafrost thermal regime and the active layer thickness. In the four numerical scenarios considered, simulations were forced by the same meteorological data, except the snow precipitation, which was systematically altered to change timing of snowfall. The scenarios represent subtle shifts in snow timing, but the snow onset/melt days, the end of winter snowpack depth, and total annual snow precipitation are unchanged among scenarios. The simulations show that small shifts in the timing of snow accumulation can have significant effects on subsurface thermal conditions leading to active layer deepening and even talik formation when snowfall arrives earlier in the winter. The shifts in snow timing have a stronger impact on wetter regions, especially soil underneath small ponds, as compared to drained regions. This study highlights the importance of understanding potential changes in winter precipitation patterns for reliable projections of active-layer thickness in a changing Arctic climate. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	intra-annual variability; permafrost degradation; simulations; snow precipitation; talik formation
语种	英语
scopus关键词	Permafrost; Timing circuits; Active layer deepening; Hydrology modeling; Intra-annual variability; Meteorological data; Microbial decomposition; Snow accumulation; Thermal condition; Winter precipitation; Snow; annual variation; decomposition; freeze-thaw cycle; hydrological cycle; microbial activity; permafrost; precipitation (climatology); sensitivity analysis; snow; snow accumulation; surface temperature
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153913
作者单位	Climate Change Science Institute, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
推荐引用方式 GB/T 7714	Jan A.,Painter S.L.. Permafrost thermal conditions are sensitive to shifts in snow timing[J],2020,15(8).
APA	Jan A.,&Painter S.L..(2020).Permafrost thermal conditions are sensitive to shifts in snow timing.Environmental Research Letters,15(8).
MLA	Jan A.,et al."Permafrost thermal conditions are sensitive to shifts in snow timing".Environmental Research Letters 15.8(2020).