气候变化领域集成服务门户(CCPortal): Observation of the process of snow accumulation on the Antarctic Plateau by time lapse laser scanning

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DOI	10.5194/tc-13-1983-2019
	Observation of the process of snow accumulation on the Antarctic Plateau by time lapse laser scanning
	Picard G.; Arnaud L.; Caneill R.; Lefebvre E.; Lamare M.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1983
结束页码	1999
卷号	13 期号:7
英文摘要	Snow accumulation is the main positive component of the mass balance in Antarctica. In contrast to the major efforts deployed to estimate its overall value on a continental scale to assess the contribution of the ice sheet to sea level rise knowledge about the accumulation process itself is relatively poor, although many complex phenomena occur between snowfall and the definitive settling of the snow particles on the snowpack. Here we exploit a dataset of near-daily surface elevation maps recorded over 3 years at Dome C using an automatic laser scanner sampling 40100 m2 in area. We find that the averaged accumulation is relatively regular over the 3 years at a rate of C8:7 cmyr-1. Despite this overall regularity, the surface changes very frequently (every 3 d on average) due to snow erosion and heterogeneous snow deposition that we call accumulation by "patches". Most of these patches (60 %85 %) are ephemeral but can survive a few weeks before being eroded. As a result, the surface is continuously rough (68 cm root-meansquare height) featuring meter-scale dunes aligned along the wind and larger, decameter-scale undulations. Additionally, we deduce the age of the snow present at a given time on the surface from elevation time series and find that snow age spans over more than a year. Some of the patches ultimately settle, leading to a heterogeneous internal structure which reflects the surface heterogeneity, with many snowfall events missing at a given point, whilst many others are overrepresented. These findings have important consequences for several research topics including surface mass balance, surface energy budget, photochemistry, snowpack evolution, and the interpretation of the signals archived in ice cores. © 2019 Author(s).
学科领域	elevation; glacier mass balance; heterogeneity; ice sheet; laser method; sea level change; snow accumulation; snow cover; snowpack; Antarctic Plateau; Antarctica; Dome Concordia; East Antarctica
语种	英语
scopus关键词	elevation; glacier mass balance; heterogeneity; ice sheet; laser method; sea level change; snow accumulation; snow cover; snowpack; Antarctic Plateau; Antarctica; Dome Concordia; East Antarctica
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/118856
作者单位	UGA, CNRS, Institut des Géosciences de l'Environnement (IGE), UMR 5001, Grenoble, 38041, France; Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
推荐引用方式 GB/T 7714	Picard G.,Arnaud L.,Caneill R.,et al. Observation of the process of snow accumulation on the Antarctic Plateau by time lapse laser scanning[J],2019,13(7).
APA	Picard G.,Arnaud L.,Caneill R.,Lefebvre E.,&Lamare M..(2019).Observation of the process of snow accumulation on the Antarctic Plateau by time lapse laser scanning.The Cryosphere,13(7).
MLA	Picard G.,et al."Observation of the process of snow accumulation on the Antarctic Plateau by time lapse laser scanning".The Cryosphere 13.7(2019).