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The Continual Intercomparison of Radiation Codes (CIRC) Status report to GRP, August 2011

The Continual Intercomparison of Radiation Codes (CIRC) Status report to GRP, August 2011. Lazaros Oreopoulos 1 and Eli Mlawer 2. 1 NASA-GSFC, Greenbelt, MD, USA (Chair) 2 AER, Lexington, MA, USA (co-Chair). What CIRC is about.

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The Continual Intercomparison of Radiation Codes (CIRC) Status report to GRP, August 2011

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  1. The Continual Intercomparison of Radiation Codes (CIRC) Status report to GRP, August 2011 Lazaros Oreopoulos1 and Eli Mlawer2 1NASA-GSFC, Greenbelt, MD, USA (Chair) 2AER, Lexington, MA, USA (co-Chair)

  2. What CIRC is about • RT model intercomparison intended to be the standard for documenting the performance of RT codes used in Large-Scale Models (LSMs) • Working group within IRC and GRP • Goal is to have RT codes of GCMs (incl. IPCC) report performance against CIRC • Phase 1 was launched on June 4, 2008 • Phase “1a” was launched on January 19, 2010 (16 simpler variants of Phase I cases) • Website: http://circ.gsfc.nasa.gov • How CIRC differs from previous intercomparisons: • Observation-tested (LW) LBL calculations are used as radiative benchmarks • Benchmark results are publicly available • Observationally-based input (chiefly from an ARM product named BBHRP) • Intended to have flexible structure and be continual (i.e. updated periodically)

  3. CIRC activities since last report and current status • Phase 1a launch, January 2010 • Submissions for Phase 1 sub-cases (“Phase 1a”) received • Technical paper on Phase to be submitted to JGR-Atmos this week • CIRC now completely unfunded (neither co-chair has currently DOE-BER funding) • No CIRC presentation at the last GRP meeting (1-day only due to pan-GEWEX) • IRC letter to IPCC WG1 co-chairmen about CIRC; response advises to contact WGCM/WGNE • IRC letter to WGCM; WGCM invites CIRC to WGCM/WGNE October meeting in Boulder

  4. Longwave code participants

  5. Shortwave code participants

  6. Longwave % errors (model-LBL) N/A 3 2 1 0 -1 -2 -3

  7. Shortwave % errors (model-LBL) N/A 10 5 0 -5 -10

  8. Overall performance

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