Table 3. Detailed error budget for reflectance method (Slater 1991)(a,b)
Present Anticipated
--------------- -----------------
Error Overall Error Overall
Source (%) Error (%) (%) Error (%)
--------------------- ----- -------- ----- ---------
Ground reflectance measurement 2.1 1.2
Reflectance panel calibration (BRF) 2.0 1.0
Diffuse field correction 0.5 0.5
Measurement errors 0.5 0.5
Optical depth measurements 5.4 1.1 5.4 1.1
Errors in extinction optical depth 5.0 5.0
Errors in partition into Mie and Ray. 2.0 2.0
Absorption computations 1.3 1.0
Ozone amount 20.0 15.0
Choice of complex index of refract. aerosols 2.0 2.0 1.5 1.5
Choice of size distribution of aerosols 3.0 1.5
Type
Size limits 0.5 0.5
Junge parameter 0.5 0.5
Aerosol vertical distribution 0.1 0.1 0.1 0.1
Non-Lambertian ground characteristic 1.2 1.2 0.5 0.5
Non-polarized versus polarized code 0.1 0.1 0.1 0.1
Inherent code accuracy 1.0 1.0 1.0 1.0
Uncertainty in the value of ms 0.2 0.2 0.2 0.2
TOTAL ERROR (RMS) 4.9 3.0
(a) Private discussions with P. N. Slater, 1991, University of Arizona, Tucson, Arizona.
(b) For Table 3, uncertainties are in % error with reference to exoatmospheric irradiance. First and third columns refer to values on the left. Second and
fourth columns refer to the resultant effect of these uncertainties on radiance at the satellite detector.