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The Nimbus 4 infrared spectroscopy experiment. 2: Comparison of observed and theoretical radiance from 425-1450 cm(minus 1)The Nimbus 4 infrared interferometer spectrometer (IRIS) measured the thermal emission of the earth's atmosphere and surface from 400-1600/cm with an apodized spectral resolution of 2.8/cm. A comparison of theoretical radiances, computed from in-situ measurements and using a direct integration slant path atmospheric transmittance model, with the observed IRIS radiances has been made to verify the radiometeric and spectral performance of the instrument and to assess the accuracy of the atmospheric transmittances. The radiance comparison has indicated a relatively constant difference of less than 5% in the water vapor continuum in the 425-550/cm and 750-1200/cm atmospheric window regions while in the 667/cm CO2 band the difference was 5-10%. The absolute accuracy was found to be approximately 5-10% for each of the parameters; measured radiances, in-situ measurements, and the atmospheric transmittances, thus it is not possible to uniquely specify the degree of error arising from each parameter in the total resultant difference.
Document ID
19730018587
Document Type
Technical Memorandum (TM)
Authors
Kunde, V. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Conrath, B. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hanel, R. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Maguire, W. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Prabhakara, C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Salomonson, V. V. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 2, 2013
Publication Date
June 1, 1973
Subject Category
GEOPHYSICS
Report/Patent Number
NASA-TM-X-66275
X-622-73-160
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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