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 language | English |
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Journal | I E E E Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
Volume | 8 |
Issue number | 7 |
Pages (from-to) | 3656-3664 |
ISSN | 1939-1404 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- Antarctica
- L-band radiometer
- Radiometer