Airborne L-band radiometer mapping of the dome-C area in Antarctica

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Abstract

A 350 km × 350 km area near the Concordia station on the high plateau of Dome-C in Antarctica has been mapped by an airborne L-band radiometer system. The area was expected to display a rather uniform brightness temperature (TB) close to the yearly mean temperature-well suited for calibration checks for spaceborne instruments like SMOS, Aquarius, and SMAP. The measured TBs show unexpected variations like 8-K variation over 240 km on an east-west profile through Concordia, and in certain local cases, a slope of about 0.7 K/km. Comparing the measured TB map with bottom topography reveals a convincing correlation. Simulations show that variations in bedrock topography can indeed modulate the TB appropriately to explain the observed variations. It is concluded that use of the Dome-C area for calibration check of spaceborne radiometers is indeed viable, but with caution-especially when comparing instruments with different spatial resolutions.
Original languageEnglish
JournalI E E E Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Volume8
Issue number7
Pages (from-to)3656-3664
ISSN1939-1404
DOIs
Publication statusPublished - 2015

Keywords

  • Antarctica
  • L-band radiometer
  • Radiometer

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