March 28, 2022 Journal article Open Access

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

Citation Style Language JSON Export

{
  "DOI": "10.1017/jog.2022.19", 
  "abstract": "Abstract\n\t  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 \u00d7 10\u22128 to 8 \u00d7 10\u22128 kPa\u22123 a\u22121 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\u22122 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\u22122 in the central portion of the profile.", 
  "author": [
    {
      "family": "Kenneth C. Jezek"
    }, 
    {
      "family": "Caglar Yardim"
    }, 
    {
      "family": "Joel T. Johnson"
    }, 
    {
      "family": "Giovanni Macelloni"
    }, 
    {
      "family": "Marco Brogioni"
    }
  ], 
  "id": "90489", 
  "issued": {
    "date-parts": [
      [
        2022, 
        3, 
        28
      ]
    ]
  }, 
  "language": "eng", 
  "note": "", 
  "title": "Analysis of ice-sheet temperature profiles from low-frequency airborne remote sensing", 
  "type": "article-journal"
}