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SUMMARY:Particle-Turbulence interactions in multi-component mixtures: Clou
 d microphysical implications - Sat Ghosh
DTSTART:20180417T120000Z
DTEND:20180417T130000Z
UID:TALK104413@talks.cam.ac.uk
CONTACT:Charlotte Coles
DESCRIPTION:This study explores primarily the coupling of dynamical and mi
 crophysical processes involving both natural and anthropogenic particles o
 ver the Bay of Bengal. The vertical transport of sea spray to cloud bases 
 is first quantified from measurements. Sea salt aerosol distributions are 
 then incorporated into a detailed chemical parcel model accounting for str
 ong non-linear effects in concentrated droplets which subsequently grow to
  form much larger raindrops through a process of stochastic coalescence.\n
 \nThe second part of the study focuses on the effect of millimeter-scale v
 ortices obtained during both stormy as well non-stormy days on the quantif
 ication of rain rates. In essence\, rescaled settling of the small inertia
 l particles (mainly the film mode drops) is obtained as they are centrifug
 ed out of vortices and eddies in turbulence. This process enhances the ave
 rage sedimentation rate of particles lying below a critical radius (~ 20 m
 icrons) by about 80% strongly impacting rain rates. Whilst earlier studies
  have shown that multicomponent mixtures perturb the AerosolŠ\\Cloud Drop
 let relationships over certain regimes\; this first study shows that when 
 multiple aerosol modes are present within convective clouds\, another adde
 d perturbing effect ¨the enhanced settling rates from the centrifuging ac
 tion of the microscale eddies increases precipitation rates over the Bay o
 f Bengal.\n\nWider implications are also discussed including recent new ca
 lculations on the mass accommodation of condensable vapours on an assortme
 nt of particle size distributions.
LOCATION:LR3B\, Inglis Building\, CUED 
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