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PROFESSIONAL INTERESTS: Dr. Hallett is involved in basic and applied research in field and laboratory studies related to convective cloud precipitation processes, aerosol formation and scavenging, cloud electrification and the role of clouds in atmospheric radiation processes. He is investigating the basic mechanisms of crystal growth with particular reference to the surface structure of ice and the transition to ice dendrite growth in the atmosphere. These studies relate to how atmospheric aerosols influence the optical properties of ice and water clouds from the viewpoint of climate change and the formation of precipitation. He has developed new instruments for measurement by aircraft of cloud and precipitation liquid and ice content, and also for measurement of surface snowfall and rainfall at high resolution.
RESEARCH AREAS:
- Cloud Physics, Cloud Electrification, Atmospheric Chemistry, Climate Dynamics, Physical Meteorology
SELECTED PUBLICATIONS:
- Petersen, D., M. Bailey, J. Hallett, and W.H. Beasley, 2006:
- Laboratory investigation of positive streamer discharges from simulated ice hydrometeors. Q.J.R. Meteorol. Soc., 132, 1-11.
- Oraltay, R.G., and J. Hallett, 2005:
- The Melting Layer: A Laboratory Investigation of Ice Particle Melt and Evaporation near 0°C. J. Applied Met., 44(2), 206-220.
- Bailey, M., and J. Hallett, 2004:
- Growth rates and habits of ice crystals between -20°C and -70°C.
J. Atmos. Sci., 61, 514-544.
- Mo., Q., A.G. Detwiler, J. Hallett, and R. Black, 2003:
- Horizontal structure of the electric field in the stratiform region of an Oklahoma mesoscale convective system. J. Geophys. Res., 108(D7), 4225, doi:10.1029/2001JD001140.
- Korolev, A.V., G.A. Isaac, S.G. Cober, J.W. Strapp, and J. Hallett, 2003 Part A:
- Microphysical Characterization of Mixed Phase Clouds. Q.J.R. Meteorol. Soc., 129, 39-66.
- Barkey, B., M. Bailey, K.-N. Liou, and J. Hallett, 2002:
- Light-scattering properties of plate and column ice crystals generated in a laboratory cold chamber. Applied Optics, 41(27), 5792-5796.
- Foster, T.C., and J. Hallett, 2002:
- The Alignment of Ice Crystals in Changing Electric Fields. Atmos. Res., 62, 149-169.
- Hallett, J., W.P. Arnott, M.P. Bailey, and J.T. Hallett, 2002:
- Cirrus. Ice Crystals in Cirrus. K.D. Lynch, K. Sassen, D. O'C. Starr, G. Stephens (Eds.), Oxford University Press Inc., New York, NY, Chpt. 3, pp. 41-77.
- Liu, Y., P.H. Daum, and J. Hallett, 2002:
- A generalized systems theory for the effect of varying fluctuation on cloud droplet size distributions. J. Atmos. Sci., 59, 2279-1290.
- Bailey, M., and J. Hallett, 2002:
- Nucleation, Growth and Habit Distribution of Cirrus Type Crystals Under Controlled Laboratory Conditions. Q.J.R. Meteorol. Soc., 128, 1461-1484.
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