Institute of Radiation and Remote Sensing
(Division of Physical Sciences, UCLA)

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The Institute of Radiation and Remote Sensing (IRRS) pursues research areas associated with remote sensing of clouds from satellites, computer simulations of radiative transfer in cloud and aerosol atmospheres, light scattering and spectroscopy involving ice crystal clouds, and applications of radiation and cloud research to climate studies.

• Personnel
• K. N. Liou, Ph.D., Director and Professor of Atmospheric Sciences
• S. C. (Steve) Ou, Ph.D., Senior Research Scientist
• Yoshi Takano, Ph.D., Associate Research Scientist
• Brian Barkey, Ph.D., Research Associate
• Philippe Rolland, Ph.D., Research Associate
• Rick Hansell, M.S., Graduate Assistant
• Cynthia Shih, M.S., Ph.D. Student
• Yong Chen, M.S., Ph.D. Student
• John Roskovensky, M.S., Ph.D. Student
• Melissa Licker, B.A., Administrative Assistant
• Chad Toves, A.A., Undergraduate Research Assistant

• Research Programs
• Radiative Transfer in Cirrus Clouds: Theory and Experiment; Division of Atmospheric Sciences, National Science Foundation
• Radiation Parameterization for Three-Dimensional Inhomogeneous Cirrus Clouds Applied to ARM Data and Climate Models; Atmospheric Radiation Measurement (ARM) Program, Department of Energy
• Laser Transmission Through Cirrus Clouds; Air-Borne Laser Program, Air Force Office of Scientific Research
• Radiative Transfer and Remote Sensing in Aerosol Atmosphere; Goddard Space Flight Center, NASA
• Remote Sensing of the Optical and Microphysical Properties of Cirrus Clouds Using MODIS Channels; Goddard Earth Sciences Directorate, NASA
• Cloud Algorithm Development to Support NPOESS; Raytheon

• Recent Publications (1999-2000)

• Barkey, B., K.N. Liou, W. Gellermann, and P. Sokolsky, 1999:  An analog light scattering experiment of hexagonal ice-like particles.  Part I.  Experimental apparatus and test measurements.  J. Atmos. Sci., 55, 605-612.
•  Barkey, B., K.N. Liou, Y. Takano, W. Gellermann, and P. Sokolsky, 1999:  An analog light scattering experiment of hexagonal ice-like particles.  Part II.  Experimental and theoretical results.  J. Atmos. Sci.,  55, 613-625.
•  Liou, K.N., Y. Takano, and P. Yang, 1999: Light scattering and radiative transfer in ice crystal clouds: Applications to climate research.  In ?Light Scattering by Nonspherical Particles: Theory, Measurements and Geophysical Applications.?  Eds. M.I. Mishchenko, J.W. Hovenier, and L.D. Travis, Academic Press, New York, Chapter 15.
• Yang, P., and K.N. Liou, 1999: Finite difference time domain method for light scattering by nonspherical and nonhomogeneous particles.   In ?Light Scattering by Nonspherical Particles: Theory, Measurements and Geophysical Applications.?  Eds. M.I. Mishchenko, J.W. Hovenier, and L.D. Travis, Academic Press, New York, Chapter 7.
• Ou, S.C., K.N. Liou,  M.D. King, and S.C. Tsay, 1999:  Remote sensing of cirrus cloud parameters based on a 0.63-3.7 ?m radiance correlation technique applied to AVHRR data.  Geophys. Res. Lett.,  26, 2437-2440.
• Yang, P., K.N. Liou, K. Wyser, and D. Mtichell, 2000: Parameterization of the scattering and absorption properties of individual ice crystals.  J. Geophys.Res., 105,  4699-4718.
• Rolland, P., K.N. Liou, M.D. King, S.C. Tsay, and G.M. McFarquhar, 2000: Remote sensing of optical and microphysical properties of cirrus clouds using MODIS channels: methodology and sensitivity to assumptions.  J. Geophys. Res., 105,  11,721-11,738.
• Redeman, J., R. Turco, K. N. Liou, P. Hobbs, W. Hartley, R. Bergstrom, E. Browell, and P. Russell, 2000: Case studies of the vertical structure of the direct short wave aerosol radiative forcing during TARFOX.  J. Geophy. Res., 105, 9971-9979.
• Redemann, J., R. Turco, K. N. Liou, P. Russell, R. Bergstrom, B. Schmitt, J. Livingston, P. Hobbs, W. Hartley, S. Ismail, R. Ferrare, and E. Browell, 2000: Retrieving the vertical structure of the effective aerosol complex index of refraction from a combination of aerosol in situ and remote sensing  measurements during TARFOX.  J. Geophy. Res., 105, 9949-9970.
• Gu, Y., and K.N. Liou, 2000: Interactions of radiation,  microphysics, and turbulence in the evolution of cirrus clouds. J. Atmos. Sci., 56, 2463-2479.
• Liou, K.N., Y. Takano, P. Yang, and Y. Gu, 2000: Radiative transfer in cirrus clouds: Light scattering and spectral information.  In ?Cirrus?.  Ed. D. Lynch, Oxford University Press, New York. (in press).
• Barkey, B., K.N. Liou, Y. Takano, and W. Gellermann, 2000: Experimental and theoretical spectral reflection measurements of ice clouds generated in a laboratory chamber.  Appl. Opt.,  39, 3561-3564.
• Liou, K.N., Y. Takano, S.C. Ou, and M. W. Johnson, 2000: Laser transmission through thin cirrus clouds.  Appl. Opt., 39, 4886-4894.
• Yang, P., K.N. Liou, M. I. Mishchenko, and B. C. Gao, 2000: An efficient finite difference time domain scheme for light scattering by dielectric particles: Application to aerosols.  Appl. Opt.,  39, 3727-3737.
• Gu, Y., and K.N. Liou, 2000: Radiation parameterization for three-dimensional inhomogeneous cirrus clouds: Application to climate models.  J. Climate, (in press).
• Barkey, B., K.N. Liou, 2001: Polar nephelometer for light-scattering measurements of ice crystals: Opt. Lett., 26, 232-234.

• Highlights of Research and Development