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SUMMARY:The importance of ice-nucleating particles in tropical deep convec
 tive clouds - Rachel Hawker - University of Leeds
DTSTART:20210215T110000Z
DTEND:20210215T120000Z
UID:TALK157018@talks.cam.ac.uk
CONTACT:76948
DESCRIPTION:Convective cloud systems in the maritime tropics play a critic
 al role in global climate\, but accurately representing aerosol interactio
 ns within these clouds persists as a major challenge for weather and clima
 te modelling. The importance of ice-nucleating particles (INP)\, aerosols 
 which can catalyse the freezing of cloud droplets\, for tropical deep conv
 ection has been examined. Firstly\, simulations of a complex tropical conv
 ective cloud field were conducted using a regional model with advanced dou
 ble-moment microphysics. The radiative properties of the cloud field are v
 ery sensitive to the chosen representation of INP. In particular\, the tem
 perature dependence of the INP number concentrations\, which is affected b
 y aerosol source and composition\, is a key determinant of the cloud field
  radiative properties. Secondly\, statistical emulation of simulations of 
 an idealised deep convective cloud was carried out. The anvil of the ideal
 ised deep convective cloud\, including anvil ice crystal number concentrat
 ion and anvil extent (both of which have important climate impacts)\, are 
 extremely sensitive to the INP number concentrations across the entirety o
 f the mixed-phase temperature spectrum. The results have implications for 
 climate model simulations of tropical clouds and radiation\, which general
 ly do not consider a link between INP particle type and ice water content.
  The results also highlight the importance of quantifying the full spectru
 m of INP number concentrations across all mixed-phase altitudes\, somethin
 g that is logistically and technically challenging.
LOCATION:Zoom
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