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Far infrared measurements of cirrus

Russell, Jaqueline E., Nolt, Ira G., Vanek, Michael D., Tappan, N. D., Minnis, Patrick, Alltop, J. L., Ade, Peter A. R., Lee, C., Hamilton, Peter A., Evans, K. Franklin, Evans, A. H., Clothiaux, Eugene E. and Baran, Anthony J. 1999. Far infrared measurements of cirrus. Presented at: Satellite Remote Sensing of Clouds and the Atmosphere IV, Florence, Italy, 20-22 September 1999. Published in: Russell, Jaqueline E. ed. Satellite Remote Sensing of Clouds and the Atmosphere IV : 20-22 September 1999, Florence, Italy (Proceedings). Proceedings of SPIE--the International Society for Optical Engineering , vol. 3867. Bellingham, WA: The International Society for Optical Engineering, pp. 28-38. 10.1117/12.373072

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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.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Far infrared ; Particles ; Sensors ; Clouds ; Spectral resolution ; Spectrometers ; Water ; Polarization ; Polarizers ; Remote sensing
Publisher: The International Society for Optical Engineering
ISBN: 0819434620
ISSN: 0277-786X
Last Modified: 04 Jun 2017 06:46
URI: http://orca.cf.ac.uk/id/eprint/64689

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