Snow_Cover_Extent_and_Depth_1757
1
2020-07-02T00:00:00Z
2023-07-17T16:59:20Z
ABoVE: High Resolution Cloud-Free Snow Cover Extent and Snow Depth, Alaska, 2001-2017
ABoVE: High Resolution Cloud-Free Snow Cover Extent and Snow Depth, Alaska, 2001-2017
This dataset provides estimates of maximum snow cover extent (SCE) and snow depth for each 8-day composite period from 2001 to 2017 at 1 km resolution across Alaska. The study area covers the majority land area of Alaska except for areas covered by perennial ice/snow or open water. A downscaling scheme was used in which Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) global reanalysis 0.5 degree snow depth data were interpolated to a finer 1 km spatial grid. In the methods used, the downscaling scheme incorporated MODIS SCE (MOD10A2) to better account for the influence of local topography on the 1km snow distribution patterns. For MODIS cloud-contaminated pixels, persistent and patchy cloud cover conditions were improved by applying an elevation-based spatial filtering algorithm to predict snow occurrence. Cloud-free MODIS SCE data were then used to downscale MERRA-2 snow depth data. For each snow-covered 1 km pixel indicated by the MODIS data, the snow depth was estimated based on the snow depth of the neighboring MERRA-2 0.5 grid cell, with weights predicted using a spatial filter.
10.3334/ORNLDAAC/1757
https://doi.org
false
true
2020-07-02T00:00:00Z
3
Variables mapped on uniform space-time grid scales with completeness and consistency
ORNL_DAAC
Yi, Y., J. Kimball, and C.E. Miller. 2020. ABoVE: High Resolution Cloud-Free Snow Cover Extent and Snow Depth, Alaska, 2001-2017. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1757
COMPLETE
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https://science.nasa.gov/earth-science/earth-science-data/data-information-policy
License URL for data use policy
Data Use Policy
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0
NetCDF-4
ALASKA
2001-01-01T00:00:00Z
2017-12-30T23:59:59Z
ARCHIVER
ORNL_DAAC
ORNL DAAC User Services Office, P.O. Box 2008, MS 6407, Oak Ridge National Laboratory
Oak Ridge
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37831-6407
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(865) 241-3952
Direct Line
uso@daac.ornl.gov
EARTH SCIENCE
TERRESTRIAL HYDROSPHERE
SNOW/ICE
SNOW COVER
EARTH SCIENCE
TERRESTRIAL HYDROSPHERE
SNOW/ICE
SNOW DEPTH
Terra
Earth Observing System, Terra (AM-1)
Earth Observation Satellites
MODIS
Moderate-Resolution Imaging Spectroradiometer
Aqua
Earth Observing System, Aqua
Earth Observation Satellites
MODIS
Moderate-Resolution Imaging Spectroradiometer
ABoVE
Arctic-Boreal Vulnerability Experiment
https://daac.ornl.gov/above/Snow_Cover_Extent_and_Depth/
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https://daac.ornl.gov/ABOVE/guides/Snow_Cover_Extent_and_Depth.html
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https://doi.org/10.3334/ORNLDAAC/1757
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OPENDAP DATA
https://data.ornldaac.earthdata.nasa.gov/public/above/Snow_Cover_Extent_and_Depth/comp/Snow_Cover_Extent_and_Depth.pdf
ABoVE: High Resolution Cloud-Free Snow Cover Extent and Snow Depth, Alaska, 2001-2017: Snow_Cover_Extent_and_Depth.pdf
GENERAL DOCUMENTATION
https://daac.ornl.gov/ABOVE/guides/Snow_Cover_Extent_and_Depth_Fig1.png
Part of the snow depth data processing data showing the downscaled MERRA-2 (in meters) snow depth data. Left image shows snow depth during spring snow melt for 23-30 April, 2007. Right image shows snow depth during early snow accumulation for 30 September-7 October, 2007. Source: Yi et al. 2019.
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