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  • Meteorology and Climatology  (3)
  • 2010-2014  (3)
  • 1995-1999
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    Use of MODIS Snow-Cover Maps for Detecting Snowmelt Trends in North America (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: Research has shown that the snow season in the Northern Hemisphere has been getting shorter in recent decades, consistent with documented global temperature increases. Specifically, the snow is melting earlier in the spring allowing for a longer growing season and associated land-cover changes. Here we focus on North America. Using the Moderate-Resolution Imaging Radiometer (MODIS) cloud-gap-filled standard snow-cover data product we can detect a trend toward earlier spring snowmelt in the approx 12 years since the MODIS launch. However, not all areas in North America show earlier spring snowmelt over the study period. We show examples of springtime snowmelt over North America, beginning in March 2000 and extending through the winter of 2012 for all of North America, and for various specific areas such as the Wind River Range in Wyoming and in the Catskill Mountains in New York. We also compare our approx 12-year trends with trends derived from the Rutgers Global Snow Lab snow cover climate-data record.
    Keywords: Meteorology and Climatology
    Type: GSFC.ABS.7286.2012 , 69th Eastern Snow Conference (ESC); Jun 05, 2012 - Jun 07, 2012; Claryville, NY; United States
    Format: application/pdf
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  • 2
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    A Review of Global Satellite-Derived Snow Products (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Snow cover over the Northern Hemisphere plays a crucial role in the Earth s hydrology and surface energy balance, and modulates feedbacks that control variations of global climate. While many of these variations are associated with exchanges of energy and mass between the land surface and the atmosphere, other expected changes are likely to propagate downstream and affect oceanic processes in coastal zones. For example, a large component of the freshwater flux into the Arctic Ocean comes from snow melt. The timing and magnitude of this flux affects biological and thermodynamic processes in the Arctic Ocean, and potentially across the globe through their impact on North Atlantic Deep Water formation. Several recent global remotely sensed products provide information at unprecedented temporal, spatial, and spectral resolutions. In this article we review the theoretical underpinnings and characteristics of three key products. We also demonstrate the seasonal and spatial patterns of agreement and disagreement amongst them, and discuss current and future directions in their application and development. Though there is general agreement amongst these products, there can be disagreement over certain geographic regions and under conditions of ephemeral, patchy and melting snow
    Keywords: Meteorology and Climatology
    Type: GSFC.JA.00423.2012
    Format: application/pdf
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  • 3
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    A Comparison of Satellite-Derived Snow Maps with a Focus on Ephemeral Snow in North Carolina (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper, we focus on the attributes and limitations of four commonly-used daily snowcover products with respect to their ability to map ephemeral snow in central and eastern North Carolina. We show that the Moderate-Resolution Imaging Spectroradiometer (MODIS) fractional snow-cover maps can delineate the snow-covered area very well through the use of a fully-automated algorithm, but suffer from the limitation that cloud cover precludes mapping some ephemeral snow. The semi-automated Interactive Multi-sensor Snow and ice mapping system (IMS) and Rutgers Global Snow Lab (GSL) snow maps are often able to capture ephemeral snow cover because ground-station data are employed to develop the snow maps, The Rutgers GSL maps are based on the IMS maps. Finally, the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) provides some good detail of snow-water equivalent especially in deeper snow, but may miss ephemeral snow cover because it is often very thin or wet; the AMSR-E maps also suffer from coarse spatial resolution. We conclude that the southeastern United States represents a good test region for validating the ability of satellite snow-cover maps to capture ephemeral snow cover,
    Keywords: Meteorology and Climatology
    Type: Proceedings of the 67th Eastern Snow Conference; Jun 08, 2010 - Jun 10, 2010; Hancock, MA; United States
    Format: application/pdf
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