DOI: 10.5194/hess-18-4601-2014
Scopus记录号: 2-s2.0-84912576063
论文题名: Application of MODIS snow cover products: Wildfire impacts on snow and melt in the Sierra Nevada
作者: Micheletty P ; D ; , Kinoshita A ; M ; , Hogue T ; S
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 11 起始页码: 4601
结束页码: 4615
语种: 英语
Scopus关键词: Continuous time systems
; Deforestation
; Fires
; Image reconstruction
; Radiometers
; Satellite imagery
; Sun
; Water supply
; Fractional snow covers
; Highly-correlated
; Moderate resolution imaging spectroradiometer
; Resource managers
; Snow covered area
; Snow-cover products
; Spatial and temporal changes
; Spatial and temporal variability
; Snow
; algorithm
; forest fire
; MODIS
; pixel
; snow cover
; snowmelt
; snowpack
; spatiotemporal analysis
; wildfire
; Ecosystems
; Melting
; Snow
; California
; Sierra Nevada [California]
; United States
英文摘要: The current work evaluates the spatial and temporal variability in snow after a large forest fire in northern California using Moderate Resolution Imaging Spectroradiometer (MODIS) snow-covered area and grain size (MODSCAG). MODIS MOD10A1 fractional snow-covered area and MODSCAG fractional snow cover products are utilized to detect spatial and temporal changes in snowpack after the 2007 Moonlight Fire and an unburned basin, Grizzly Ridge, for water years (WY) 2002-2012. Estimates of canopy-adjusted and non-adjusted MODSCAG fractional snow-covered area (fSCA) are smoothed and interpolated to provide a continuous time series of average daily snow extent over the two basins. The removal of overstory canopy by wildfire exposes more snow cover; however, elemental pixel comparisons and statistical analysis show that the MOD10A1 product has a tendency to overestimate snow coverage pre-fire, muting the observed effects of wildfire. The MODSCAG algorithm better distinguishes subpixel snow coverage in forested areas and is highly correlated to soil burn severity after the fire. Annual MODSCAG fSCA estimates show statistically significant increased fSCA in the Moonlight Fire study area after the fire (P < 0.01 for WY 2008-2011) compared to pre-fire averages and the control basin. After the fire, the number of days exceeding a pre-fire high snow-cover threshold increased by 81%. Canopy reduction increases exposed viewable snow area and the amount of solar radiation that reaches the snowpack, leading to earlier basin average melt-out dates compared to the nearby unburned basin. There is also a significant increase in MODSCAG fSCA post-fire regardless of slope or burn severity. Regional snow cover change has significant implications for both short-and long-term water supply for impacted ecosystems, downstream communities, and resource managers. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78074
Appears in Collections: 气候变化事实与影响
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作者单位: Hydrologic Sciences and Engineering, Colorado School of Mines, Golden, CO, United States; Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, United States; Department of Civil, Construction, and Environmental Engineering, San Diego State University, San Diego, CA, United States
Recommended Citation:
Micheletty P,D,, Kinoshita A,et al. Application of MODIS snow cover products: Wildfire impacts on snow and melt in the Sierra Nevada[J]. Hydrology and Earth System Sciences,2014-01-01,18(11)