The Continual Intercomparison of Radiation Codes (CIRC) - GEWEX

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Historical Perspective (1) ICRCCM-I (1984 - 1991): InterComparison of Radiation Codes for Climate Models, WCRP/IRC) - LW: Ellingson and Fouquart (1991) -~60 idealized cases (mostly cloudless) - SW: Fouquart et al. (1991) -~60 idealized cases (again, mostly cloudless) - LBL vs. approximate models Overall message : for cloudless skies, errors can be alarmingly large LW
Historical Perspective (2) •ICRCCM-II (1991): SPECTRE (FIRE II) Emphasis on LW and cloudless skies Ellingson and Wiscombe (BAMS, 1996) Overall message : using observations to assess models can be fruitful, but is HARD ... Genesis of the ARM program.
Page 1: The Continual Intercomparison of Ra
Page 5 and 6: Historical Perspective (4) ICRCCM-I
Page 7 and 8: So, what is the Continual Intercomp
Page 9 and 10: Challenges we faced • For input a
Page 11 and 12: CIRC Phase I cases Case SZA PWV (cm
Page 13 and 14: SW QC: Spectral comparison with RRT
Page 15 and 16: Phase I launch • Mass e-mail on J
Page 17 and 18: CAM3 RT vs. RRTMG 5 4 LW down SFC o
Page 19 and 20: Importance of spectral surface albe
Page 21 and 22: CO 2 forcing net flux profile diffe
Page 23: CIRC activities and future • Talk

The Continual Intercomparison of Radiation Codes (CIRC) - GEWEX

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