Far infrared measurements of cirrus

Ira G. Nolt; Michael D. Vanek; N. D. Tappan; Patrick Minnis; J. L. Alltop; Peter A. R. Ade; C. Lee; Peter A. Hamilton; K. Franklin Evans; A. H. Evans; Eugene E. Clothiaux; Anthony J. Baran

doi:10.1117/12.373072

8 December 1999 Far infrared measurements of cirrus

Ira G. Nolt, Michael D. Vanek, N. D. Tappan, Patrick Minnis, J. L. Alltop, Peter A. R. Ade, C. Lee, Peter A. Hamilton, K. Franklin Evans, A. H. Evans, Eugene E. Clothiaux, Anthony J. Baran

Author Affiliations +

Proceedings Volume 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV; (1999) https://doi.org/10.1117/12.373072
Event: Remote Sensing, 1999, Florence, Italy

Abstract

Improved techniques for remote sensing of cirrus are needed to obtain global data for assessing the effect of cirrus in climate change models. Model calculations show that the far infrared/sub-millimeter spectral region is well suited for retrieving cirrus Ice Water Path and particle size parameters. Especially useful cirrus information is obtained at frequencies below 60 cm^-1 where single particle scattering dominates over thermal emission for ice particles larger than about 50 micrometer. Earth radiance spectra have been obtained for a range of cloud conditions using an aircraft-based Fourier transform spectrometer. The Far InfraRed Sensor for Cirrus (FIRSC) is a Martin-Puplett interferometer which incorporates a polarizer for the beamsplitter and can be operated in either intensity or linear polarization measurement mode. Two detector channels span 10 to 140 cm^-1 with a spectral resolution of 0.1 cm^-1; achieving a Noise Equivalent Temperature of approximately 1K at 30 cm^-1 in a 4 sec scan. Examples are shown of measured and modeled Earth radiance for a range of cloud conditions from 1998 and 1999 flights.

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Ira G. Nolt, Michael D. Vanek, N. D. Tappan, Patrick Minnis, J. L. Alltop, Peter A. R. Ade, C. Lee, Peter A. Hamilton, K. Franklin Evans, A. H. Evans, Eugene E. Clothiaux, and Anthony J. Baran "Far infrared measurements of cirrus", Proc. SPIE 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV, (8 December 1999); https://doi.org/10.1117/12.373072

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KEYWORDS

Clouds

Calibration

Polarization

Temperature metrology

Atmospheric particles

Black bodies

Far infrared

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