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Thermally incised meltwater channels that flow each summer across melt-prone surfaces of the Greenland ice sheet have received little direct study. We use high-resolution WorldView-1/2 satellite mapping and in situ measurements to characterize supraglacial water storage, drainage pattern, and discharge across 6,812 km(2) of southwest Greenland in July 2012,(More)
We developed an automated approach for mapping persistent ice and snow cover (glaciers and perennial snowfields) from Landsat TM and ETM+ data across a variety of topography, glacier types, and climatic conditions at high latitudes (above ~65 ˝ N). Our approach exploits all available Landsat scenes acquired during the late summer (1 August–15 September)(More)
1 Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States, 2 Geography Department, University of Utah, Salt Lake City, UT, United States, 3 National Snow and Ice Data Center, University of Colorado Boulder, Boulder, CO, United States, 4 Department of Geology, University of Maryland, College Park, College Park, MD, United(More)
Our poor understanding of tidewater glacier dynamics remains the primary source of uncertainty in sea level rise projections. On the ice sheets, mass lost from tidewater calving exceeds the amount lost from surface melting. In Alaska, the magnitude of calving mass loss remains unconstrained, yet immense calving losses have been observed. With 20% of the(More)
Remote sensing of snow-covered area (SCA) can be binary (indicating the presence/absence of snow cover at each pixel) or fractional (indicating the fraction of each pixel covered by snow). Fractional SCA mapping provides more information than binary SCA, but is more difficult to implement and may not be feasible with all types of remote sensing data. The(More)
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