Test and evaluation of a VTPR retrieval system from clear-column NOAA 2 radiances.
Dyck, Harry Milton
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An iterative technique for the retrieval of temperatures at each of 100 levels ranging from 1000 mb to 0.01 mb is evaluated. Clear-column radiance data in the carbon dioxide channels of the VTPR of NOAA 2 are used in inverting the radiative transfer equations to deduce the T(P) profile. The retrieval technique includes the computation of atmospheric transmittances due to three atmospheric absorber masses (carbon dioxide, water vapor, and ozone) and non-homogeneous temperature-pressure effects along the vertical. The program also corrects these transmittances for zenith path differences between the satellite and the retrieval site when the site is not directly below the sensor. A normalized wave number, close to 700 cm , but decreasing with decreasing values of pressure, was used in solving the Planck function for temperature, level-by-level. The retrieved temperatures were then compared with matching radiosondes at 15 key atmospheric levels and the resulting errors analyzed on a globally averaged and latitude band basis at each of the 15 levels.
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