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.  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.