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    Snow Dunes: A Controlling Factor of Melt Pond Distribution on Arctic Sea Ice (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The location of snow dunes over the course of the ice-growth season 2007/08 was mapped on level landfast first-year sea ice near Barrow, Alaska. Landfast ice formed in mid-December and exhibited essentially homogeneous snow depths of 4-6 cm in mid-January; by early February distinct snow dunes were observed. Despite additional snowfall and wind redistribution throughout the season, the location of the dunes was fixed by March, and these locations were highly correlated with the distribution of meltwater ponds at the beginning of June. Our observations, including ground-based light detection and ranging system (lidar) measurements, show that melt ponds initially form in the interstices between snow dunes, and that the outline of the melt ponds is controlled by snow depth contours. The resulting preferential surface ablation of ponded ice creates the surface topography that later determines the melt pond evolution.
    Keywords: Meteorology and Climatology
    Type: GSFC-E-DAA-TN9285 , Journal of Geophysical Research; 117; C9; C09029
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Snow in the Changing Sea-Ice Systems (2018)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Snow is the most reflective, and also the most insulative, natural material on Earth. Consequently, it is an integral part of the sea-ice and climate systems. However, the spatial and temporal heterogeneities of snow pose challenges for observing, understanding and modelling those systems under anthropogenic warming. Here, we survey the snow-ice system, then provide recommendations for overcoming present challenges. These include: collecting process-oriented observations for model diagnostics and understanding snow-ice feedbacks, and improving our remote sensing capabilities of snow for monitoring large-scale changes in snow on sea ice. These efforts could be achieved through stronger coordination between the observational, remote sensing and modelling communities, and would pay dividends through distinct improvements in predictions of polar environments.
    Keywords: Meteorology and Climatology
    Type: GSFC-E-DAA-TN62433 , Nature Climate Change (ISSN 1758-678X) (e-ISSN 1758-6798); 8; 946–953
    Format: text
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    NASA TECHNICAL REPORTS
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