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DOI10.14430/arctic68654
Accelerated Springtime Melt of Snow on Tundra Downwind from Northern Alaska River Systems Resulting from Niveo-aeolian Deposition Events
de Boer, Gijs1,2; Cox, Christopher J.1,2; Creamean, Jessie M.1,2,3
发表日期2019
ISSN0004-0843
EISSN1923-1245
卷号72期号:3页码:245-257
英文摘要

It is well known that light-absorbing particulate matter (PM) enhances absorption of sunlight when deposited on ice and snow. Such increased absorption is due to a reduction in surface albedo, resulting in accelerated melt of frozen surfaces. In isolation, earlier melt enhances Arctic warming since dark surfaces underlying snow and ice are exposed and absorb additional solar energy. Here, we combine various observational tools to demonstrate that aeolian deposition of PM along fluvial features on the North Slope of Alaska resulted in a notable reduction of surface albedo in the spring of 2016, from values typical for snow (similar to 0.8) to around 0.35 on average. This reduction resulted in accelerated snow and ice melt by up to three weeks compared to unaffected areas. This phenomenon was observed to some degree in 12 other years dating back to 2003. Deposition generally was found to occur near particular sections of the rivers, with several areas affected by events in multiple years. In all years, the deposition is attributed to high wind events. The extreme case in 2016 is linked to unusually strong and extraordinarily persistent winds during April. The deposited material is thought to be the natural sediment carried by the rivers, resulting in a seasonally replenished source of PM. These findings indicate a previously unreported impact of both fluvial and atmospheric processes on the seasonal melt of northern Alaska rivers.


WOS研究方向Environmental Sciences & Ecology ; Physical Geography
来源期刊ARCTIC
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/102277
作者单位1.Univ Colorado, Cooperat Inst Res Environm Sci, 216 UCB, Boulder, CO 80309 USA;
2.NOAA, Phys Sci Div, 325 Broadway, Boulder, CO 80305 USA;
3.Colorado State Univ, Dept Atmospher Sci, 3915B W Laporte Ave, Ft Collins, CO 80521 USA
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de Boer, Gijs,Cox, Christopher J.,Creamean, Jessie M.. Accelerated Springtime Melt of Snow on Tundra Downwind from Northern Alaska River Systems Resulting from Niveo-aeolian Deposition Events[J],2019,72(3):245-257.
APA de Boer, Gijs,Cox, Christopher J.,&Creamean, Jessie M..(2019).Accelerated Springtime Melt of Snow on Tundra Downwind from Northern Alaska River Systems Resulting from Niveo-aeolian Deposition Events.ARCTIC,72(3),245-257.
MLA de Boer, Gijs,et al."Accelerated Springtime Melt of Snow on Tundra Downwind from Northern Alaska River Systems Resulting from Niveo-aeolian Deposition Events".ARCTIC 72.3(2019):245-257.
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