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John C. Gille
and
Tay-how Lee

Abstract

The theory and data for calculating the positions, intensifies, and half-widths of the spectral lines of ammonia with frequencies <1400 cm−1 are described. The ground state rotation, μ2, 2ν2− ν2, and the rotation-inversion bands of ν2 and 2ν2 were included. The quantities necessary to fit a random-exponential band model are tabulated in 25 cm−1 intervals for temperatures from 100 to 225K at 25K intervals. Temperature and pressure corrections to the half-widths for application to the Jovian atmosphere are given. Consideration of the line shape suggests that opacity in the 200–700 cm−1, interval will be due to local lines, except possibly at very low temperatures and high pressures.

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Tay-How Lee
,
Dennis Chesters
, and
Anthony Mostek

Abstract

Surface temperature and dewpoint reports are added to the infrared radiances from the VISSR Atmospheric Sounder (VAS) in order to improve the retrieval of temperature and moisture profiles in the lower troposphere. The conventional (airways) surface data are combined with the 12 VAS channels as additional predictors in a ridge regression retrieval scheme, with the aim of using all available data to make high resolution space-time interpolations of the radiosonde network. For one day of VAS observations, retrievals using only VAS radiances are compared with retrievals using VAS radiances plus surface data. Temperature retrieval accuracy evaluated at coincident radiosonde sites shows a significant impact within the boundary layer. Dewpoint retrieval accuracy shows a broader improvement within the lowest tropospheric layers. The most dramatic impact of surface data is observer in the spatial and temporal continuity of low-level fields retrieved over the Midwestern United States.

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