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| Titel |
Application of MODIS snow cover products: wildfire impacts on snow and melt in the Sierra Nevada |
| VerfasserIn |
P. D. Micheletty, A. M. Kinoshita, T. S. Hogue |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 11 ; Nr. 18, no. 11 (2014-11-24), S.4601-4615 |
| Datensatznummer |
250120530
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| Publikation (Nr.) |
 copernicus.org/hess-18-4601-2014.pdf |
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| Zusammenfassung |
| 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. |
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