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SUMMARY:Effects of Current Flow in the Global Circuit on Winter Storm Vort
 icity and Polar Surface Pressures - Brian Tinsley\, Centre for Space Scien
 ces\, Univ. of Texas\, Dallas\, USA
DTSTART:20080611T130000Z
DTEND:20080611T140000Z
UID:TALK12169@talks.cam.ac.uk
CONTACT:Tracy Moffat-Griffin
DESCRIPTION:Analysis of meteorological gridded data shows responses of atm
 ospheric dynamics to external forcing (solar wind) and internal forcing (l
 ow latitude\nthundercloud current output) of the global electric circuit. 
 This affects the downward flow of current density through layer clouds\, a
 nd the space (unipolar) charge at cloud boundaries and at droplet concentr
 ation gradients within clouds. Our working model involves charges on ice f
 orming nuclei enhancing contact ice nucleation and precipitation\, for exa
 mple in the layer clouds in the warm front region of winter cyclones. It a
 lso involves charges on CCN affecting their rates of being scavenged by dr
 oplets\, and eventually affecting droplet size distributions and cloud cov
 er.
LOCATION:British Antarctic Survey\, Room 330B
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