The approximation developed covers 18 spectral intervals spanning the solar spectrum from 0.2 to 0.5 micro-m, handles water vapor and droplets, and simulates partial cloud cover and cloud overlap. A.D. Del Genio, R.A. Reudy, J. Geophys. The model includes absorption and scattering due to ozone, water vapor, oxygen, CO 2 and aerosols, and Rayleigh scattering. Fluxes and heating rates compare to within a few percent with results using high spectral resolution and multiple-scattering calculations. Explores reasons why the GCM of the Laboratoire de M t orologie Dynamique is more sensitive to a global perturbation of sea surface temperatures than most other models.
Results have implications for climate sensitivity studies.
J.C. Orr, U. Siegenthaler, J. Geophys. Atmospheric p CO 2 was prescribed for the period 1750-1990 using the combined Siple ice core and Mauna Loa records. Sci., Northwestern Univ. Model experiments show that global thermohaline circulation exhibits bimodal equilibria, in the high-latitude North Atlantic, as a consequence of imbalances in the rates of change of advective and eddy freshwater fluxes, but that the present circulation is dynamically stable. Uses a spectral boundary in wave-number space rather than a lateral boundary in real space.