Comparison of GEO BB fluxes with SARB

• Purpose
  • To check the consistency between the fluxes and the given cloud property and atmospheric inputs
  • SARB un-tuned flux estimates are from FU-Liou radiative transfer calculations based on input cloud property and GEOS profiles
• Method
  • Compute SYN for July 2002 for one latitude band
  • Compare with CERES fluxes and MODIS cloud properties as a baseline
  • Compare with GEO derived broadband fluxes and GEO cloud properties
    • Errors due to both NB to BB and cloud property errors
• Preliminary - first attempt results

Fig. 9b: Comparison of GEO SW BB and CERES fluxes with SARB

GEO	CERES

Fig. 9c: Comparison of GEO LW BB and CERES fluxes with SARB

GEO-daytime	CERES

Fig. 9d: Comparison of GEO BB fluxes with SARB

• Preliminary results show promise
• Need to further study the large SW flux scenes and LW GEO cloud emissivities
  • Evaluate GEO fluxes with MODIS clouds
  • Evaluate CERES fluxes with GEO clouds
• TISA will work with SARB to deliver SYN and AVG products in the near future
  
  

  (%)	SW		LW
  	CERES	GEO	CERES	GEO
  Bias	4.5	3.6	0.3	<0.1
  RMS	10.8	18.0	2.5	3.6