Research Council’s Board on Atmospheric Sciences and Climate and recently served on its Committee on the Atmospheric Dispersion of Hazardous Material Releases. He received his Ph.D. in mechanical engineering from Pennsylvania State University.

JAMES C. MCWILLIAMS is a professor of earth sciences at the University of California, Los Angeles, and a research scientist at the National Center for Atmospheric Research. As a geophysical fluid dynamicist, he explores how material advection in a fluid produces the peculiar combination of global order and local chaos, and vice versa, evident in oceanic currents, as well as analogous phenomena in atmospheric and astrophysical flows. Some of his particular interests are coherent vortices in turbulence, interactions among surface waves and nearby winds and currents, general circulation of the ocean, Earth’s climate and its intrinsic variability, coastal physical-biogeochemical dynamics, and computational simulations of natural systems. Dr. McWilliams is a fellow of the American Geophysical Union and a member of the National Academy of Sciences and has served on several committees of the National Research Council, including the Committee on the Science of Climate Change. Dr. McWilliams received his Ph.D. in applied mathematics from Harvard University.

DAVID A. RANDALL has been a professor in the Department of Atmospheric Science at Colorado State University since 1988. Prior to that, he held positions at the Massachusetts Institute of Technology and the National Aeronautics and Space Administration. Most of his research centers around further development and applications of a global atmospheric model, which is coupled with a land-surface model and an ocean model. His current research focus is on modeling studies of clouds and their role in the global climate system. Ongoing projects include development of improved cloud parameterization methods and an investigation of the role of clouds in climate dynamics. Dr. Randall is chief editor of the Journal of Climate. He received his Ph.D. in atmospheric sciences from the University of California, Los Angeles.

YUK L. YUNG is a professor in the Division of Geological and Planetary Sciences at the California Institute of Technology. He is interested in the chemistry, radiation, and transport in the terrestrial and planetary atmospheres and the application of global datasets to study climate change. His current research includes planets, high-precision remote sensing from space, isotopic atmospheric chemistry, and what influences and is influenced by the ozone layer. Dr. Yung is a fellow of the American Geophysical Union and a member of Academia Sinica’s Advisory Panel, the American Astronomical Society (Division of Planetary Science), and the National Research Council’s Climate Research Committee. Dr. Yung has authored two books and more than 160 professional papers. He holds a Ph.D. in physics from Harvard University.

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