March 28, 2022 Journal article Open Access

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

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  <identifier identifierType="URL">https://www.openaccessrepository.it/record/90489</identifier>
  <creators>
    <creator>
      <creatorName>Kenneth C. Jezek</creatorName>
    </creator>
    <creator>
      <creatorName>Caglar Yardim</creatorName>
    </creator>
    <creator>
      <creatorName>Joel T. Johnson</creatorName>
    </creator>
    <creator>
      <creatorName>Giovanni Macelloni</creatorName>
    </creator>
    <creator>
      <creatorName>Marco Brogioni</creatorName>
    </creator>
  </creators>
  <titles>
    <title>Analysis of ice-sheet temperature profiles from low-frequency airborne remote sensing</title>
  </titles>
  <publisher>INFN Open Access Repository</publisher>
  <publicationYear>2022</publicationYear>
  <subjects>
    <subject>Earth-Surface Processes</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2022-03-28</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://www.openaccessrepository.it/record/90489</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1017/jog.2022.19</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://www.openaccessrepository.it/communities/itmirror</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">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.</description>
  </descriptions>
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