Steven K. Krueger Professor B.A.   Physics, Pomona College Ph.D. Atmospheric Sciences, UCLA Office   817 W. B. Browning Bldg. Phone   801-581-3903 Fax      801-585-3681 E-Mail  skrueger@met.utah.edu Mailing address Dept. of Meteorology University of Utah 135 S 1460 E, Room 819 Salt Lake City, UT  84112-0110

Teaching Interests

• Meteo 3410: Weather Observation and Analysis I
• Meteo 6150: Cloud System Modeling

Atmospheric  convection, numerical modeling, boundary layer cloudiness, turbulent mixing.

Research Overview

My research interests include numerical simulation of cloud systems, with particular emphasis on the interactions between large-scale and cloud-scale processes, as well as turbulence and mixing in clouds.

At UCLA, I developed the predecessor of the University of Utah Cloud Resolving Model (UU CRM). A cloud resolving model resolves individual clouds in a domain that is large enough to simulate the evolution of a cloud system. The UU CRM has been extensively used for simulating Tropical cumulus ensembles and studying their interactions with  large-scale processes. It has been used at the University of Utah to study stratocumulus and trade cumulus boundary layer clouds, mid-level stratiform (altocumulus) clouds, Tropical convective cloud systems,  convective plumes produced by Arctic leads, and Arctic stratus clouds.

I am involved with several national and international research programs aimed at better understanding the processes the determine the nature of various cloud systems, with the ultimate goal being to improve the representation of clouds in global climate models.

The ARM (Atmospheric Radiation Measurement) Program is making continuous observations of clouds and radiation at five sites, one in the Southern Great Plains, three in the Tropical Western Pacific, and one on the North Slope of Alaska.The goals of ARM are to improve the representations of cloud processes and radiative transfer in global climate models. As part of our ARM research project, we have:

• Developed an elevated mixed-layer model for altocumulus clouds
• Tested cloud fraction parameterizations using cloud radar retrievals of boundary layer cloud properties
• Constucted a cloud climatology of the ARM Southern Great Plains site
• Compiled estimates of radiative fluxes and heating rates during TOGA COARE
• Studied the effects of deep cumulus convection on the boundary layer over the Southern Great Plains.
• Compared cirrus cloud properties from a cloud-resolving model simulation to those retrieved from cloud radar observations by Jay Mace's group in our department.
• Evaluated cirrus properties simulated by a single-column model using cloud radar observations and results from a cloud-resolving model simulation.

Publications in Review or in Press

Publication List

Preprints List
 

• Mike Zulauf, Research Associate, Department of Meteorology, University of Utah
• Yali Luo, Ph.D. student

• Steven Lazarus, Assistant Professor of Meteorology, Department of Marine and Environmental Systems, Florida Institute of Technology
• Qiuqing Zhang, Research Associate, Department of Meteorology, University of Utah
• Ching-Hsuan Chen

• Mike Zulauf, Ph.D. (2001): Dissertation: Modeling the Effects of Boundary Layer Circulations Generated by Cumulus Convection and Leads on Large-Scale Surface Fluxes
• Jason Burks, M.S. (1998) Thesis: Radiative Fluxes and Heating Rates during TOGA COARE over the Intensive Flux Array
• Shuairen Liu, Ph.D. (1998) Dissertation: Numerical Modeling of Altocumulus Cloud Layers
• Chwen-Wei Su, Ph.D. (1997) Dissertation: Linear Eddy Modeling of Entrainment and Mixing  in Cumulus Clouds
• George McLean, M.S. (1994) Thesis: Boundary Layer Circulation Changes during the Stratus to Cumulus Transition
• Alain Bergeron, M.S. (1993) Thesis: Modeling the Trade-Wind Boundary Layer
• John Close, M.S. (1991)