The International Intercomparison of 3-Dimensional Radiation Codes
Cahalan, R.F., NASA/Goddard Space Flight Center
Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting
I3RC (International Intercomparison of 3-dimensional Radiation Codes) has as its pri-mary goal to compare a wide variety of three-dimensional (3D) radiative transfer meth-ods applied to Earth's atmosphere, with a few selected cloud fields as input, and a few selected radiative quantities as output. Phases 1 and 2 are now complete, and partici-pants represented institutions in Canada, France, Germany, Russia, the United Kingdom, and the USA, who met for two workshops in Tucson, Arizona USA, and compared re-sults from 5 cloud fields of varying complexity, beginning with simplified atmosphere and surface, and proceeding to more realistic cases. Phase 3 is now underway, focusing on improvement and sharing of 3D radiation code, aided by working groups on "Ap-proximations" and "Open Source". The "Approximations" group has so far focused on diffusive approximate methods in an attempt to gain advantages in execution time, and also to advance the understanding of 3D radiation processes. The "Open Source" sub-grou
Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).
