BEGIN:VCALENDAR
PRODID:-//Columba Systems Ltd//NONSGML CPNG/SpringViewer/ICal Output/3.3-
 M3//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20190211T151525Z
DTSTART:20190501T120000Z
DTEND:20190501T130000Z
SUMMARY:Clouds in the laboratory: Wind tunnel experiments on collision-co
 alescence and riming
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}uwb-js0hbrl
 w-dl98wi
DESCRIPTION:Since 30 years the Mainz Vertical Wind Tunnel facility is ope
 rational for experiments on cloud microphysics and chemistry with emphas
 is on larger hydrometeors.  After the extending the facility for perform
 ing experiments down to -30 C processes relevant for mixed phase clouds 
 can be simulated. Recently such experiments to characterize the collisio
 n-coalescence process have been conducted for riming and warm-cloud rain
  formation. Further experiments were dedicated to the investigation of t
 he chemical “retention process” of trace substances (e.g.\, SO2\, H2O2\,
  formaldehyde\, several organic acids\, and aldehydes \, ammonia\, HNO3 
 \,and HCl) during riming on small ice spheres and snow flakes. “Retentio
 n” here means the “carry over” of these substances from the initial liqu
 id solution of the "polluted"\, riming\, supercooled droplets onto the f
 rozen hydrometeors.  (Some of the materials are returned back to the gas
  phase –and lost from the hydrometeors- during the freezing process.) Th
 e amounts of this retention influence the vertical distribution of the t
 race gases inside the large convective clouds as well as their “export” 
 through the anvil outflows at high altitudes. This is of relevance for e
 xample in the context of the Asian Monsoon Anticyclone where large amoun
 ts of trace materials are transported from the boundray layer to high al
 titudes by deep convective clouds. At first in the presentation several 
 cloud physical processes (like rain formation\, freezing\, and riming) d
 emonstrated by means of high speed camera video clips. Then an overview 
 of the most recently obtained experimental results is provided together 
 with a discuaaion of their significance.  
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:G.03\, Williamson Building\, Manchester
END:VEVENT
END:VCALENDAR