31 January 2002 Far-infrared remote sensing measurements of cirrus clouds during AFWEX
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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.
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Clare Lee, Clare Lee, K. Franklin Evans, K. Franklin Evans, Ira G. Nolt, Ira G. Nolt, William L. Smith, William L. Smith, Michael D. Vanek, Michael D. Vanek, "Far-infrared remote sensing measurements of cirrus clouds during AFWEX", Proc. SPIE 4539, Remote Sensing of Clouds and the Atmosphere VI, (31 January 2002); doi: 10.1117/12.454461; https://doi.org/10.1117/12.454461

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