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Proceedings Paper

Far-infrared remote sensing measurements of cirrus clouds during AFWEX
Author(s): Clare Lee; K. Franklin Evans; Ira G. Nolt; William L. Smith; Michael D. Vanek
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Paper Abstract

Remote sensing measurements of cirrus clouds are crucial for improving global climate models. Spectral measurements of the far-infrared region provide especially useful information to retrieve cirrus ice water path and particle size properties. Earth radiance spectra of this region have been obtained for a range of cloud conditions using the airborne instrument FIRSC (Far-InfraRed Sensor for Cirrus). The instrument flew on board the high altitude Proteus aircraft in the ARM-FIRE Water Vapor Experiment (AFWEX) during the Nov - Dec 2000 Intensive Operations Period. FIRSC is a Martin-Puplett type Fourier transform spectrometer with two channels covering the ranges 10 - 33 cm-1 and 80 -140 cm-1 at a resolution of 0.1 cm-1. It has achieved a noise equivalent temperature of approximately 1K at 30 cm-1 using a scan duration of 4 seconds. For the first time this far-infrared data has been compared to data from the thermal IR NAST-I (NPOESS Airborne Sounder Testbed - Interferometer), which was part of the same payload during the AFWEX flights. Retrievals of cirrus ice water path and particle size from the FIRSC data are presented.

Paper Details

Date Published: 31 January 2002
PDF: 7 pages
Proc. SPIE 4539, Remote Sensing of Clouds and the Atmosphere VI, (31 January 2002); doi: 10.1117/12.454461
Show Author Affiliations
Clare Lee, Univ. of Wales Cardiff (United Kingdom)
K. Franklin Evans, Univ. of Colorado/Boulder (United States)
Ira G. Nolt, NASA Langley Research Ctr. (United States)
William L. Smith, NASA Langley Research Ctr. (United States)
Michael D. Vanek, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 4539:
Remote Sensing of Clouds and the Atmosphere VI
Klaus Schaefer; Olga Lado-Bordowsky; Adolfo Comeron; Michel R. Carleer; Janet S. Fender, Editor(s)

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