DOI: 10.5194/hess-22-3575-2018
论文题名: Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado
作者: Baldo E. ; Margulis S.A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 7 起始页码: 3575
结束页码: 3587
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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163268
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Baldo E.,Margulis S.A.. Assessment of a multiresolution snow reanalysis framework: A multidecadal reanalysis case over the upper Yampa River basin; Colorado[J]. Hydrology and Earth System Sciences,2018-01-01,22(7)