March 28, 2022 Journal article Open Access

Kenneth C. Jezek; Caglar Yardim; Joel T. Johnson; Giovanni Macelloni; Marco Brogioni

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  <dc:creator>Kenneth C. Jezek</dc:creator>
  <dc:creator>Caglar Yardim</dc:creator>
  <dc:creator>Joel T. Johnson</dc:creator>
  <dc:creator>Giovanni Macelloni</dc:creator>
  <dc:creator>Marco Brogioni</dc:creator>
  <dc:date>2022-03-28</dc:date>
  <dc:description>Abstract
	  Ice internal temperature and basal geothermal heat flux (GHF) are analyzed along a study line in northwestern Greenland. The temperatures were obtained from a previously reported inversion of airborne microwave brightness-temperature spectra. The temperatures vary slowly through the upper ice sheet and more rapidly near the base increasing from ~259 K near Camp Century to values near the melting point near NorthGRIP. The flow-law rate factor is computed from temperature data and analytic expressions. The rate factor increases from ~1 × 10−8 to 8 × 10−8 kPa−3 a−1 along the line. A laminar flow model combined with the depth-dependent rate factor is used to estimate horizontal velocity. The modeled surface velocities are about a factor of 10 less than interferometric synthetic aperture radar (InSAR) surface velocities. The laminar velocities are fitted to the InSAR velocities through a factor of 8 enhancement of the rate factor for the lower 25% of the column. GHF values retrieved from the brightness temperature spectra increase from ~55 to 84 mW m−2 from Camp Century to NorthGRIP. A strain heating correction improves agreement with other geophysical datasets near Camp Century and NEEM but differ by ~15 mW m−2 in the central portion of the profile.</dc:description>
  <dc:identifier>https://www.openaccessrepository.it/record/90489</dc:identifier>
  <dc:identifier>10.1017/jog.2022.19</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>url:https://www.openaccessrepository.it/communities/itmirror</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/</dc:rights>
  <dc:subject>Earth-Surface Processes</dc:subject>
  <dc:title>Analysis of ice-sheet temperature profiles from low-frequency airborne remote sensing</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>