Microchimica Acta

, Volume 95, Issue 1–6, pp 421–427 | Cite as

A radiometrie fourier transform spectrometer for the measurement of downwelling atmospheric emission

  • Daniel D. LaPorte
  • James D. Carpenter
  • Henry E. Revercomb
High Resolution and Atmospheric Studies


Radiometrically accurate downwelling emission from the atmosphere has been measured using a ground-based ambient temperature Michelson interferometer with a liquid-helium-cooled SiAs detector. Measurements were made under a wide range of atmospheric conditions covering very-cold, very-dry, very-clear sky conditions to heavy overcast with traces of sleet. Spectral resolutions of 0.5 and 0,1 cm−1 were obtained with a radiometric accuracy of less than 0.5 K and a noise level on the order of 0.25 K rms.

Overflights were made with the NASA ER2 high altitude research aircraft carrying a similar instrument [1, 2]. Aircraft and ground based LIDAR, radiosonde and other cloud physics experiments were also made at the same time to provide a data set complete enough to enable a much better understanding of the role of thin high clouds in the Earth's radiation balance.

Measurements were made over the period from 10/24/86 to 11/21/86 in support of the NOAA/NASA/NSF project FIRE (First ISCCP Regional Experiment).

Key words

downwelling emission FTIR radiometric atmosphere H2O (water) 


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Daniel D. LaPorte
    • 1
  • James D. Carpenter
    • 1
  • Henry E. Revercomb
    • 2
  1. 1.Santa Barbara Research CenterGoletaUSA
  2. 2.Space Science and Engineering CenterUniversity of Wisconsin-MadisonMadisonUSA

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