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Article Dans Une Revue Annales Geophysicae Année : 2002

An explanation for some fallstreak clouds

R. M. Worthington
  • Fonction : Auteur

Résumé

Fallstreak cirrus clouds are associated with super-saturated air, together with waves, instabilities and/or turbulence; however, their precise cause is usually uncertain. This paper uses already-published satellite, radiosonde and radar data, reanalysed to study some large fallstreaks which had been previously overlooked. The fallstreaks ? up to 60 km long with a parent cloud 20 km wide ? are caused by lifting and/or turbulence from a mountain wave, rather than, for example, Kelvin-Helmholtz instabilities. If turbulent breaking of mountain waves affects ice particle formation, this may be relevant for the seeder-feeder effect on orographic rain, and the efficiency of mountain-wave polar stratospheric clouds for ozone depletion.
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Dates et versions

hal-00317017 , version 1 (18-06-2008)

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  • HAL Id : hal-00317017 , version 1

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R. M. Worthington. An explanation for some fallstreak clouds. Annales Geophysicae, 2002, 20 (5), pp.711-715. ⟨hal-00317017⟩

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