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https://doi.org/10.5194/acp-2020-972
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-972
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  12 Oct 2020

12 Oct 2020

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This preprint is currently under review for the journal ACP.

Quasi-coincident Observations of Polar Stratospheric Clouds by Ground-based Lidar and CALIOP at Concordia (Dome C, Antarctica) from 2014 to 2018

Marcel Snels1, Francesco Colao2, Ilir Shuli1, Andrea Scoccione1,3, Mauro De Muro1,4, Michael Pitts5, Lamont Poole6, and Luca di Liberto1 Marcel Snels et al.
  • 1Istituto di Scienze dell'Atmosfera e del Clima, Via Fosso del Cavaliere 100, 00133 Roma
  • 2ENEA, Via Enrico Fermi 45, 00044, Frascati, Italy
  • 3Aeronautica Militare, Italy
  • 4Thales Alenia Space, Rome, Italy
  • 5NASA Langley Research Center, Hampton, Virginia 23681, USA
  • 6Science Systems and Applications, Inc., Hampton, Virginia, 23666, USA

Abstract. Polar stratospheric clouds (PSCs) have been observed from 2014 to 2018 from the lidar observatory at the Antarctic Concordia station (Dome C), included as a primary station in the NDACC (Network for Detection of Atmospheric Climate Change). Many of these measurements have been performed in coincidence with overpasses of the satellite-borne CALIOP (Cloud Aerosol Lidar with Orthogonal Polarization) lidar, in order to perform a comparison in terms of PSC detection and 5 composition classification. Good agreement has been obtained, despite of intrinsic differences in observation geometry and data sampling. This study reports, up to our knowledge, the most extensive comparison of PSC observations by ground-based and satellite-borne lidars.

The PSCs observed by the ground-based lidar and CALIOP form a complementary and congruent dataset, and allow to study the seasonal and interannual variations of PSC occurrences at Dome C. Moreover a strong correlation with the formation temperature of NAT (Nitricacidtrihydrate), TNAT, calculated from local temperature, pressure and H2O and HNO3 concentrations is shown. PSCs appear at Dome C at the beginning of June up to 26 km, and start to disappear at the second half of August, when the local temperatures start to rise above TNAT. Rare PSC observations in September coincide with colder air masses below 18 km.

Marcel Snels et al.

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Marcel Snels et al.

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Short summary
5 years of polar stratospheric cloud (PSC) observations by ground-based lidar at Concordia station (Antarctica) are presented. These data have been recorded preferably in coincidence with the overpasses of the CALIOP lidar on the CALIPSO satellite. First we demonstrate that both lidars observe essentially the same thing, in terms of detection and composition of the PScs. Then we use both datasets to study seasonal and interannual variations wrt the formation temperature of NAT mixtures.
5 years of polar stratospheric cloud (PSC) observations by ground-based lidar at Concordia...
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