The objectives of the current phase of this program, ICRCCM
- III [Barker et al., 2002], are:
1) to assess the perfomance of modern 1D solar radiative
transfer codes, documenting whether the accuracy of these models has improved
compared with the results of the Fouquart et al. [1991] study
2) to evaluate how well 1D solar radiative transfer codes
compute broadband irradiances and heating rates when they operate on partially
cloudy atmospheres generated by cloud-resolving models.
The participants in this study ran their models for a
variety of atmospheric cases. Benchmark calculations were performed
for clear-sky and homogeneously cloudy cases using CHARTS (Code for High-Resolution
Accelerated Radiative Transfer [Moncet and Clough, 1997] and for cases
with unresolved clouds using four 3D Monte Carlo algorithms, which had
been validated for the clear-sky and homogeneous cloud cases as producing
results comparable to the CHARTS benchmark calculations.