Lawrence Livermore Laboratories
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The Livermore Atmospheric Model
(LAM)
In 1960, Cecil E. "Chuck" Leith began work on a GCM at Lawrence Livermore National Laboratories. Trained as a physicist, Leith became interested in atmospheric dynamics and received the blessing of LLNL director Edward Teller for a project on the general circulation. Teller's approval stemmed from his long-term interest in weather modification.
After receiving encouragement from Jule Charney, Leith spent a summer in Stockholm at the Swedish Institute of Meteorology. There he coded a five-level GCM for LLNL's newest computer, the Livermore Automatic Research Calculator (LARC), due to be delivered in the fall of 1960. Leith wrote the code based on the manual for the new machine.
Although aware of the Smagorinsky/Manabe and Mintz/Arakawa efforts, Leith worked primarily on his own. He had a working five-level model by 1961. However, he did not publish his work until 1965.[1] Nevertheless, by about 1963 Leith had made a film showing his model's results in animated form and had given numerous talks about the model.
Leith ceased work on his model -- known as LAM ("Leith Atmospheric Model" or "Livermore Atmospheric Model") --in the mid-1960s, as he became increasingly issued in statistical modeling of turbulence. In 1968, he went to the National Center for Atmospheric Research.
LAM: Model Characteristics
The initial model was based on the
Bjerknes/Richardson primitive equations. It had five vertical levels
and used a 5° x 5° horizontal grid. It covered only the
northern hemisphere, with a "slippery wall" at 60°N. In order to
damp the effects of small-scale atmospheric waves, Leith introduced
an artificially high viscosity, which caused serious problems and
stimulated Leith's career-long interest in turbulence problems.
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References
[1] C.E. Leith, "Numerical Simulation of the Earth's Atmosphere," in Methods in Computational Physics, eds. B. Alder, S. Fernbach, and M. Rotenberg (New York: Academic Press, 1965), 1-28.
