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Titre : Holes in Clouds: What They Are, How they are Producted, and Why They May be Important
Nom du conférencier : Andrew Heymsfield
Son affiliation : NCAR, Boulder
Laboratoire organisateur : LMD
Date et heure : 07-06-2012 14h00
Lieu : Ecole Polytechnique, Salle de réunion du LLR (1e étage)
Résumé :

Currently, ice production by aircraft is conventionally considered to occur as contrails, which typically form behind jet aircraft as a result of engine combustion when the air temperature is ~40°C and below, characteristic of cirrus-forming (ice-cloud) conditions. Recent evidence points to the extension of aircraft effects to temperatures where the warmer midlevel clouds are observed. When altocumulus are thin and occur at temperatures between about -10 and -35°C, aircraft can produce the peculiar and striking formations called “hole punch” and “canal” clouds, which have the appearance of dissipation trails. I will discuss observations of these features, why they can spread and persist for many
hours, and possibly important implications.

Contact :

Thibaud Thonat