North polar deposits of Mars: Extreme purity of the water ice

@article{Grima2009NorthPD,
  title={North polar deposits of Mars: Extreme purity of the water ice},
  author={Cyril Grima and Wlodek Kofman and J{\'e}r{\'e}mie Mouginot and Roger J. Phillips and Alain H{\'e}rique and Daniela Biccari and Roberto Seu and Marco Cutigni},
  journal={Geophysical Research Letters},
  year={2009},
  volume={36}
}
The polar layered deposits are the largest reservoir of water on the surface of Mars. The physical properties of the ice and their spatial distribution are largely unknown. 140,000 data points from the sounding radar SHARAD on the Mars Reconnaissance Orbiter were analyzed over the Gemina Lingula region, one‐fourth of the north polar layered deposits area. Maps of the dielectric properties of the bulk ice were drawn up. There is no basal melting signature. A drop of the dielectric constant in… 

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