BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:How does very deep convection hydrate the stratosphere? Results fr
 om a Giga-LES of Hector the Convector - Dr Thibaut Dauhut\, Laboratoire d'
 Aerologie\, Toulouse
DTSTART:20180522T120000Z
DTEND:20180522T130000Z
UID:TALK105895@talks.cam.ac.uk
CONTACT:9780
DESCRIPTION:Very deep convection transports tropospheric air and water dir
 ectly into the stratosphere. This transport may be underestimated by the g
 eneral circulation models\, due to their coarse resolution\, limiting our 
 capability to predict the future climate. The efficiency of this transport
  is analysed using a numerical simulation of the thunderstorm Hector the C
 onvector. This simulation run with a resolution of 100 m and more than 1 b
 illion grid points is a Giga Large-Eddy Simulation\, the finest ever used 
 for a case of very deep convection. It allows to represent the full Hector
  across the scales\, from the mesoscale organisation to the most energetic
  eddies. The 200-km large thunderstorm is organised at the surface by the 
 convergence lines. The latter appear along the sea breeze fronts and are i
 ntensified by the cold pools. The 10-km wide updrafts that overshoot into 
 the stratosphere develop above these convergence lines and are characteriz
 ed by a weak dilution. The km-scale eddies produce the irreversible mixing
  between the overshoots and the stratospheric air and finally the hydratio
 n. Sensitivity numerical experiments to the horizontal grid spacing show t
 hat a resolution of the order of 100 m is necessary for a reliable estimat
 e of the hydration.\n
LOCATION:MR5\, Centre for Mathematical Sciences
END:VEVENT
END:VCALENDAR