气候变化领域集成服务门户(CCPortal): Case study of spatial and temporal variability of snow cover, grain size, albedo and radiative forcing in the Sierra Nevada and Rocky Mountain snowpack derived from imaging spectroscopy

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DOI	10.5194/tc-10-1229-2016
	Case study of spatial and temporal variability of snow cover, grain size, albedo and radiative forcing in the Sierra Nevada and Rocky Mountain snowpack derived from imaging spectroscopy
	Seidel F.C.; Rittger K.; McKenzie Skiles S.; Molotch N.P.; Painter T.H.
发表日期	2016
ISSN	19940416
卷号	10 期号:3
英文摘要	Quantifying the spatial distribution and temporal change in mountain snow cover, microphysical and optical properties is important to improve our understanding of the local energy balance and the related snowmelt and hydrological processes. In this paper, we analyze changes of snow cover, optical-equivalent snow grain size (radius), snow albedo and radiative forcing by light-absorbing impurities in snow and ice (LAISI) with respect to terrain elevation and aspect at multiple dates during the snowmelt period. These snow properties are derived from the NASA/JPL Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data from 2009 in California's Sierra Nevada and from 2011 in Colorado's Rocky Mountains, USA. Our results show a linearly decreasing snow cover during the ablation period in May and June in the Rocky Mountains and a snowfall-driven change in snow cover in the Sierra Nevada between February and May. At the same time, the snow grain size is increasing primarily at higher elevations and north-facing slopes from 200 microns to 800 microns on average. We find that intense snowmelt renders the mean grain size almost invariant with respect to elevation and aspect. Our results confirm the inverse relationship between snow albedo and grain size, as well as between snow albedo and radiative forcing by LAISI. At both study sites, the mean snow albedo value decreases from approximately 0.7 to 0.5 during the ablation period. The mean snow grain size increased from approximately 150 to 650 microns. The mean radiative forcing increases from 20-2 up to 200 Wm-2 during the ablation period. The variability of snow albedo and grain size decreases in general with the progression of the ablation period. The spatial variability of the snow albedo and grain size decreases through the melt season while the spatial variability of radiative forcing remains constant. © 2016 by ASME.
学科领域	ablation; albedo; AVIRIS; elevation; energy balance; grain size; imaging method; radiative forcing; snow cover; snowmelt; snowpack; spatial distribution; spatial variation; spectroscopy; temporal variation; California; Colorado; Rocky Mountains; Sierra Nevada [California]; United States
语种	英语
scopus关键词	ablation; albedo; AVIRIS; elevation; energy balance; grain size; imaging method; radiative forcing; snow cover; snowmelt; snowpack; spatial distribution; spatial variation; spectroscopy; temporal variation; California; Colorado; Rocky Mountains; Sierra Nevada [California]; United States
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/119634
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States; Department of Geography, Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States
推荐引用方式 GB/T 7714	Seidel F.C.,Rittger K.,McKenzie Skiles S.,et al. Case study of spatial and temporal variability of snow cover, grain size, albedo and radiative forcing in the Sierra Nevada and Rocky Mountain snowpack derived from imaging spectroscopy[J],2016,10(3).
APA	Seidel F.C.,Rittger K.,McKenzie Skiles S.,Molotch N.P.,&Painter T.H..(2016).Case study of spatial and temporal variability of snow cover, grain size, albedo and radiative forcing in the Sierra Nevada and Rocky Mountain snowpack derived from imaging spectroscopy.Cryosphere,10(3).
MLA	Seidel F.C.,et al."Case study of spatial and temporal variability of snow cover, grain size, albedo and radiative forcing in the Sierra Nevada and Rocky Mountain snowpack derived from imaging spectroscopy".Cryosphere 10.3(2016).