Contact:  Lazaros Oreopoulos  and Eli Mlawer

CIRC is in many respects the successor to the seminal ICRCCM (Intercomparison of Radiation Codes in Climate Models) effort that spanned the late 80's - early 00's. CIRC distinguishes itself from ICRCCM by its emphasis on using observations to build its catalog of cases. It is intended as an evolving and regularly updated reference source for GCM-type radiative transfer (RT) code evaluation, and similar to ICRCCM, its goal is to contribute to the improvement of solar and thermal RT parameterizations. CIRC has received support by DOE's Atmospheric Radiation Measurement (ARM) program and is a project of GEWEX's GDAP and GASS panels as well as a working group within IAMAS's International Radiation Commission (IRC).