Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres

Table 3-1. Diffuse Irradiance (W m-2 Ám-1) at Selected Wavelengths Calculated
Using the BRITE Code, the Justus and Paris Code, and the Modified Justus and
Paris Code.
(Model parameters for (a) and (b) are = 1.14,
ground albedo = 0.2, O3 = 0.344 atm-cm, and H20 = 1.42 cm.)
BRITE (1) Justus/
Paris (2)
Modified
Justus/Paris (3)
Ratio,
2/1a
Ratio,
3/1b
 
  (a) = 0.27, Z = 60°
 
  0.31    11.9    25.5    17.7   2.14   1.49
  0.35   172.6   243.3   174.5   1.41   1.01
   0.4     307.2   343.5   268.5   1.12   0.87
  0.45   382.7   419.8   368.0   1.1    0.96
   0.5     306.6   351.8   317.0   1.15   1.03
  0.55   260.6   301.3   278.1   1.16   1.07
  0.71   173.6   169.7   163.9   0.98   0.94
  0.78   141.9   130.0   126.7   0.92   0.89
    0.9935    51.9    60.4    59.8   1.16   1.15
   2.1        1.85     2.3     2.3   1.24   1.24
 
  (b) = 0.51, Z = 80°
 
  0.31      0.28      0.34      0.26   1.21   0.93
  0.35    37.9    71.2    56.8   1.88   1.5 
   0.4      80.3   114.8    92.8   1.43   1.16
  0.45   125.2   160.8   133.6   1.28   1.07
   0.5     126.0   149.3   122.6   1.18   0.97
  0.55   115.0   135.0   113.3   1.17   0.99
  0.78    81.0    89.5    83.9   1.1    1.04
    0.9935    44.6    48.2    47.0   1.08   1.05

a Ratio of Justus and Paris data (2) to BRITE data (1).

b Ratio of Modified Justus and Paris data (3) tp BRITE data (1).


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