21 February 2001 Polar stratospheric cloud detection from the ILAS instrument
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Abstract
We present detection methods for polar stratospheric clouds (PSCs) from the Environment Agency of Japan's Improved Limb Atmospheric Spectrometer (ILAS) instrument during the arctic winter of 1996/1997. The PSC detection methods are based on ILAS visible channel measurements in and around the oxygen A absorption band. They involve either full nonlinear or simple linear fitting of the spectra to obtain aerosol optical thickness as a function of tangent height. PSC optical thickness is determined from a subsequent linear fit to aerosol optical thickness as a function of altitude. Results for PSC optical thickness from the two methods agree reasonably well for all cases considered in this study, but only the nonlinear fitting approach allows the definitive identification of PSC events. Comparisons with operational ILAS data products show denitrification, removal of water vapor, and generally low temperatures over the vertical region of the PSC. Finally, we present a fast and simple method for the identification of possible PSC candidates from ILAS measurements.
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Thomas P. Kurosu, Thomas P. Kurosu, Kelly Van Chance, Kelly Van Chance, Tatsuya Yokota, Tatsuya Yokota, Yasuhiro Sasano, Yasuhiro Sasano, } "Polar stratospheric cloud detection from the ILAS instrument", Proc. SPIE 4150, Optical Remote Sensing of the Atmosphere and Clouds II, (21 February 2001); doi: 10.1117/12.416946; https://doi.org/10.1117/12.416946
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