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The I3RC sprung from the natural need to compare the performance of these 3D radiative transfer codes used in a variety of current scientific work in the atmospheric sciences. I3RC is jointly funded by the US Department of Energy Atmospheric Radiation Measurement Program (DoE/ARM) and by the US National Aeronautics and Space Administration Radiation Sciences Program, and is also sponsored by the GEWEX Radiation Panel and the International Radiation Commission. I3RC intends to (1) understand and document the errors and limits of 3D methods; (2) provide baseline cases for future code development for 3D radiation; (3) promote sharing and production of 3D radiation tools; (4) derive guidelines for 3D radiation tool selection; and (5) improve atmospheric science education in 3D radiative transfer. Results from I3RC are expected to guide improvements in both remote sensing and climate modeling.


  • R. F. Cahalan and I3RC participants, 2004: The International Intercomparison of 3D Radiation Codes (I3RC): Bringing together the most advanced radiative transfer tools for cloudy atmospheres. J. Amer. Meteor. Soc. Abstract