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Proceedings Paper

Far infrared measurements of cirrus
Author(s): 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
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Paper 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.

Paper Details

Date Published: 8 December 1999
PDF: 11 pages
Proc. SPIE 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV, (8 December 1999); doi: 10.1117/12.373072
Show Author Affiliations
Ira G. Nolt, NASA Langley Research Ctr. (United States)
Michael D. Vanek, NASA Langley Research Ctr. (United States)
N. D. Tappan, NASA Langley Research Ctr. (United States)
Patrick Minnis, NASA Langley Research Ctr. (United States)
J. L. Alltop, NASA Langley Research Ctr. (United States)
Peter A. R. Ade, Queen Mary and Westfield College (United Kingdom)
C. Lee, Queen Mary and Westfield College (United Kingdom)
Peter A. Hamilton, Queen Mary and Westfield College (United Kingdom)
K. Franklin Evans, Univ. of Colorado (United States)
A. H. Evans, Univ. of Colorado (United States)
Eugene E. Clothiaux, The Pennsylvania State Univ. (United States)
Anthony J. Baran, U.K. Meteorological Office (United Kingdom)


Published in SPIE Proceedings Vol. 3867:
Satellite Remote Sensing of Clouds and the Atmosphere IV
Jaqueline E. Russell, Editor(s)

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