We wish to thank R. Ruedy for providing guidance on using GISS GCM diagnostic programs, especially the programs for computing Q flux, and to J. Lerner for the use of GCM plotting programs. This work was supported by the NASA Earth Sciences Modeling and Analysis Program, the NASA FIRE III Project, and the DOE ARM Program.
Arakawa, A., and W. H. Schubert, 1974: Interaction of a cumulus cloud ensemble with the large-scale environment. Part I. J. Atmos. Sci.,31, 674–701.
Cess, R. D., and Coauthors, 1990: Intercomparison and interpretation of climate feedback processes in 19 atmospheric general circulation models. J. Geophys. Res.,95, 16 601–16 615.
——, and Coauthors, 1996: Cloud feedback in atmospheric general circulation models: An update. J. Geophys. Res.,101, 12 791–12 794.
Dai, A., A. D. Del Genio, and I. Y. Fung, 1997: Clouds, precipitation and temperature range. Nature,386, 665–666.
Del Genio, A. D., and M.-S. Yao, 1988: Sensitivity of a global climate model to the specification of convective updraft and downdraft mass fluxes. J. Atmos. Sci.,45, 2641–2668.
——, and ——, 1993: Efficient cumulus parameterization for long-term climate studies: The GISS scheme. The Representation of Cumulus Convection in Numerical Models, Meteor. Monogr., No. 46, Amer. Meteor. Soc., 181–184.
——, A. Lacis, and R. Ruedy, 1991: Simulation of the effect of a warmer climate on atmospheric humidity. Nature,351, 382–385.
——, M.-S. Yao, W. Kovari, and K.K.-W. Lo, 1996: A prognostic cloud water parameterization for global climate models. J. Climate,9, 270–304.
Fowler, L. D., D. A. Randall, and S. A. Rutledge, 1996: Liquid and ice cloud microphysics in the CSU general circulation model. Part I: Model description and simulated microphysical processes. J. Climate,9, 489–529.
Greenwald, T. J., G. L. Stephens, S. A. Christopher, and T. H. Vonder Haar, 1995: Observations of the global characteristics and regional radiative effects of marine cloud liquid water. J. Climate,8, 2928–2946.
Hansen, J., and L. D. Travis, 1974: Light scattering in planetary atmospheres. Space Sci. Rev.,16, 527–610.
——, G. Russell, D. Rind, P. Stone, A. Lacis, S. Lebedeff, R. Ruedy, and L. Travis, 1983: Efficient three-dimensional global models for climate studies: Models I and II. Mon. Wea. Rev.,111, 609–662.
——, A. Lacis, D. Rind, G. Russell, P. Stone, I. Fung, R. Ruedy, and J. Lerner, 1984: Climate sensitivity: Analysis of feedback mechanisms. Climate Processes and Climate Sensitivity, J. E. Hansen and T. Takahashi, Eds., Amer. Geophys. Union, 130–163.
——, M. Sato, and R. Ruedy, 1995: Long-term changes of diurnal temperature cycle: Implications about mechanisms of global climate change. Atmos. Res.,37, 175–209.
——, and Coauthors, 1997: Forcings and chaos in interannual to decadal climate change. J. Geophys. Res.,102, 25 679–25 720.
Henderson-Sellers, A., 1992: Continental cloudiness changes this century. Geophys. J.,27 (3), 255–262.
IPCC, 1995: Climate Change 1995: The Science of Climate Change. Cambridge University Press, 365 pp.
Karl, T. R., and Coauthors, 1993: Asymmetric trends of daily maximum and minimum temperature. Bull. Amer. Meteor. Soc.,74, 1007–1023.
Legates, D. R., and C. J. Willmott, 1990: Mean seasonal and spatial variability in global surface air temperature. Theor. Appl. Climatol.,41, 11–21.
Li, Z.-X., and H. LeTreut, 1992: Cloud-radiation feedbacks in a general circulation model and their dependence on cloud modelling assumptions. Climate Dyn.,7, 133–139.
Miller, R. L., 1997: Tropical thermostats and low cloud cover. J. Climate,10, 409–440.
Mitchell, J. F. B., C. A. Senior, and W. J. Ingram, 1989: CO2 and climate: A missing feedback? Nature,341, 132–134.
Plantico, M. S., T. R. Karl, G. Kukla, and J. Gavin, 1990: Is recent climate change across the United States related to rising levels of anthropogenic greenhouse gases? J. Geophys. Res.,95, 16 617–16 637.
Ramanathan, V., B. R. Barkstrom, and E. F. Harrison, 1989: Climate and the earth’s radiation budget. Phys. Today,42 (5), 22–32.
Renno, N. P., and A. P. Ingersoll, 1996: Natural convection as a heat engine: A theory for CAPE. J. Atmos. Sci.,53, 572–585.
Rind, D., 1988: Dependence of warm and cold climate depiction on climate model resolution. J. Climate,1, 965–997.
Roeckner, E., U. Schlese, J. Biercamp, and P. Loewe, 1987: Cloud optical depth feedbacks and climate modelling. Nature,329, 138–140.
Senior, C. A., and J. F. B. Mitchell, 1993: Carbon dioxide and climate:The impact of cloud parameterization. J. Climate,6, 393–418.
Smith, R. N. B., 1990: A scheme for predicting layer clouds and their water content in a general circulation model. Quart. J. Roy. Meteor. Soc.,116, 435–460.
Stevens, W. K., 1997: Computers model world’s climate, but how well? New York Times, 4 November, p. F1.
Sundqvist, H., 1978: A parameterization scheme for non-convective condensation including prediction of cloud water content. Quart. J. Roy. Meteor. Soc.,104, 677–690.
Tselioudis, G., and W. B. Rossow, 1994: Global, multiyear variations of optical thickness with temperature in low and cirrus clouds. Geophy. Res. Lett.,21, 2211–2214.
——, A. D. Del Genio, W. Kovari, and M.-S. Yao, 1998: Temperature dependence of low cloud optical thickness in the GISS GCM: Contributing mechanisms and climate implications. J. Climate,11, 3268–3281.
Wetherald, R. T., and S. Manabe, 1986: An investigation of cloud cover change in response to thermal forcing. Climate Change,8, 5–23.
Yao, M.-S., and A. D. Del Genio, 1989: Effects of cumulus entrainment and multiple cloud types on a January global climate model simulation. J. Climate,2, 850–863.
Ye, B., A. D. Del Genio, and K. K.-W. Lo, 1998: CAPE variations in the current climate and in a climate change. J. Climate,11, 1997–2015.