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Strong ocean/sea-ice contrasts observed in satellite-derived ice crystal number concentrations in Arctic boundary-layer clouds
  • Iris Papakonstantinou Presvelou,
  • Odran Sourdeval,
  • Johannes Quaas
Iris Papakonstantinou Presvelou
University of Leipzig, University of Leipzig, University of Leipzig

Corresponding Author:i.presvelou@uni-leipzig.de

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Odran Sourdeval
University of Lille, University of Lille, University of Lille
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Johannes Quaas
Universität Leipzig, Universität Leipzig, Universität Leipzig
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Abstract

The Arctic climate changes at a faster rate than the rest of the globe. Boundary-layer clouds may play an important role to this change. At temperatures below 0°C, mixed-phase clouds exist and their phase and longevity is influenced by the abundance of ice crystals, which in turn is a function of aerosols serving as ice nucleating particles (INPs). Previous in-situ studies suggested a local source of INPs due to biological activity over open ocean. Here we investigate ice crystal concentrations in clouds below 2km at a large scale, by exploiting a newly-developed dataset - DARDAR-Nice - retrieved from active satellite remote sensing. The dataset spans from 2006-2016. Contrary to previous expectation, we find that at a given latitude and temperature, there are more ice crystals over sea ice than over open ocean. This enhancement is particularly found in clouds south of 70°N, but also at temperatures between 0 and -10°C.
16 Jul 2022Published in Geophysical Research Letters volume 49 issue 13. 10.1029/2022GL098207