气候变化领域集成服务门户(CCPortal): Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado

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DOI	10.5194/hess-22-3575-2018
	Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado
	Baldo E.; Margulis S.A.
发表日期	2018
ISSN	1027-5606
起始页码	3575
结束页码	3587
卷号	22 期号:7
英文摘要	A multiresolution (MR) approach was successfully implemented in the context of a data assimilation (DA) framework to efficiently estimate snow water equivalent (SWE) over a large head water catchment in the Colorado River basin (CRB), while decreasing computational constraints by 60 %. A total of 31 years of fractional snow cover area (fSCA) images derived from Landsat TM, ETM+, and OLI sensor measurements were assimilated to generate two SWE reanalysis datasets, a baseline case at a uniform 90 m spatial resolution and another using the MR approach. A comparison of the two showed negligible differences in terms of snow accumulation, melt, and timing for the posterior estimates (in terms of both ensemble median and coefficient of variation). The MR approach underestimated the baseline peak SWE by less than 2 % and underestimated day of peak and duration of the accumulation season by a day on average. The largest differences were, by construct, limited primarily to areas of low complexity, where shallow snowpacks tend to exist. The MR approach should allow for more computationally efficient implementations of snow data assimilation applications over large-scale mountain ranges, with accuracies similar to those that would be obtained using ∼100 m simulations. Such uniform resolution applications are generally infeasible due to the computationally expensive nature of ensemble-based DA frameworks. © 2018 Author(s).
语种	英语
scopus关键词	Catchments; Watersheds; Coefficient of variation; Colorado River Basin; Computational constraints; Computationally efficient; Fractional snow covers; Sensor measurements; Snow water equivalent; Uniform resolution; Snow; assessment method; catchment; data assimilation; estimation method; image resolution; Landsat; mountain region; satellite imagery; snow water equivalent; snowpack; spatial resolution; Colorado; Colorado Basin [North America]; United States; Yampa River
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159985
作者单位	Baldo, E., Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, United States; Margulis, S.A., Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Baldo E.,Margulis S.A.. Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado[J],2018,22(7).
APA	Baldo E.,&Margulis S.A..(2018).Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado.Hydrology and Earth System Sciences,22(7).
MLA	Baldo E.,et al."Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado".Hydrology and Earth System Sciences 22.7(2018).