Observations of Early Ice Formation during the ICE in Clouds Experiment: ICE-T

Andrew Heymsfield, NCAR, Boulder COPaul Field, UK Met Office, Exeter, UK

Sonia Lasher-Trapp, Purdue Univ., West Lafayette, INDave Rogers and Jeff Stith, NCAR, Boulder, CO

Zhien Wang, Dave Leon, Jeff French, and Sam Haimov, University of Wyoming, Laramie, WY

RF05 12 July 2011

RF0512 July 2011

184942

18:44:347.7C

Fast 2DC 3VCPI

185023-3.4C

19:22:30-5.7C

19:30:21-7C

185027:16, break,185718

T=-2C

T=-6C

Summary and Conclusions

• Observations in developing chimney clouds ---Updraft velocities ranging from 5-14 m/s ---Temperatures from +7 to -7C

• Active ice formation process at T>-5 to -7C~.1/L• For ICE-T clouds, secondary ice particles are

prevalent near -5C with low LWCs and vertical velocities, undetectable with higher LWCs and w’s.

• ICE-D (“dust) in 2015 from Cape Verde, AF, will target the effects of dust on cloud processes.