Special RAL/MMM Joint Seminar - Ice nucleation in the wake of warm hydrometeors

*Special RAL/MMM Joint Seminar - Wednesday, November 20, 2019 - 3:30pm

*Please note special day - Wednesday

Speaker: Prasanth Prabhakaran

Affiliation: Michigan Technological University

The formation of ice in mixed-phase clouds greatly impacts Earth’s hydrologic cycle. The intensity, distribution, and frequency of precipitation as well as radiative properties of clouds in the mid-latitudes are strongly influenced by the number concentration of ice particles. A long-standing riddle in cold clouds is the frequent observation of measured ice particle concentrations several orders of magnitude higher than measured ice-nucleating particle concentrations. Here, we report laboratory observations of copious cloud droplets and ice crystals formed in the wake of a warm, falling water drop. Aerosols were activated in the transient regions of very high supersaturation due to evaporative mixing in the wake. We extend these results to typical mixed-phase atmospheric conditions, and our calculations show that the induced evaporative supersaturation may significantly enhance the activated ice nuclei concentration in the particle’s wake. 

Refreshments: 3:15 PM

 

Building:

Room Number: 
FL2-1022 - Large Auditorium

Type of event:

Will this event be webcast to the public by NCAR|UCAR?: 
Announcement Timing: 
Monday, November 11, 2019 to Wednesday, November 20, 2019
Calendar Timing: 
Wednesday, November 20, 2019 - 3:30pm to 4:30pm

Posted by Nancy Kerner at ext. 8946, nskerner@ucar.edu

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