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Surface Hoar Analysis at Summit, Greenland

Surface Hoar Analysis at Summit, Greenland. Catherine Denoncourt University of New Hampshire Advisor: Dr. Robert Bindschadler. Discussion for Today. Background on Surface Hoar Background on SSM/I Passive Microwave Data Used Purpose:

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Surface Hoar Analysis at Summit, Greenland

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  1. Surface Hoar Analysis at Summit, Greenland Catherine Denoncourt University of New Hampshire Advisor: Dr. Robert Bindschadler

  2. Discussion for Today • Background on Surface Hoar • Background on SSM/I Passive Microwave Data Used Purpose: In search of a correlation between Surface Hoar events and SSM/I Passive Microwave data from 85 GHz frequency

  3. Summit, Greenland • Located at 72°N, 38°W • Situated atop ~ 3200 m of ice • Summer Temperature Varies from -30 to -5°C (Steffen, AWS Data) http://summitcamp.org

  4. Data from Dibb

  5. What is Hoar Frost? • Low density, coarse grained frost deposit • Formed when snow temperature is above air temperature • Vapor sublimates out of snowpack into hoar frost once hitting cold air • Conditions condusive to hoar: clear, cold day, light breeze (1-3 m/s) • At Summit, Surface Hoar usually occurs during Summer months

  6. Data Used • In-Situ Observations (Dibb) • Weather conditions • Snow Surface conditions • EASE-Grid SSM/I Passive Microwave Satellite Data (NSIDC) measuring Brightness Temperature • Used 85 GHz frequency in the Vertical and Horizontal Polarizations

  7. 37GHz Wavelength of .81 cm Depth 10’s of cm in snowpack Used most often for snow surface studies Clouds invisible 85 GHz Wavelength of .35 cm Sensitive to surface change of snow Sensitive to clouds Passive Microwave Data37 GHz vs. 85 GHz

  8. Data from Shuman, 1993

  9. Data from Shuman, 1993

  10. Observed Data from Dibb, SSM/I from NSIDC

  11. Observed Data from Dibb, SSM/I from NSIDC

  12. Observed Data from Dibb, SSM/I from NSIDC

  13. Observed Data from Dibb, SSM/I from NSIDC

  14. Observed Data from Dibb, SSM/I from NSIDC

  15. Conclusion • 85 GHz provides some capability to detect the majority of surface hoar frost events • Positive Curvatures and Large Negative Slopes on Vertical and Horizontal Polarization can help pinpoint Surface Hoar Frost Events

  16. Many thanks to: Bob Bindschadler Chris Shuman Jack Dibb Patricia Vornberger Koni Steffen National Snow and Ice Data Center UNH/NASA GSFC Research & Discover Program

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