We are grateful to Andrea Hahmann for providing her thorough analysis of the RCCM2/BATS simulation, and to Chia Chou for providing his linearized longwave radiation package. This work started as we visited the Massachusetts Institute of Technology in 1995. We have benefited from discussions with R. Dickinson, P. Dirmeyer, E. Eltahir, K. Emanuel, K. Laval, J. Polcher, J. Shukla, J. Shuttleworth, Y. Sud, and X. Zeng. Comments from an anonymous reviewer and the editor G. Bonan have helped to improve the quality of the paper. This research was supported by NSF Grant ATM-9521389 and NOAA Grant NA46GP0244.
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