検索画面に戻る Go Research

(260Kb)

[Ａ−３.８　Detection of Tropospheric and Polar Stratospheric Clouds for ILAS-type Satellite Sensors]


[Contact person]

      Tatsuya Yokota
      Program Research Manager, Center for Global Environmental Research
      National Institute for Environmental Studies, Environment Agency
      16-2 Onogawa, Tsukuba, Ibaraki 305-8506 Japan
      Tel: +81-298-50-2550, Fax: +81-298-58-2645
      E-mail: yoko@nies.go.jp
      EF Fellow name: Thomas Paul Kurosu


[Total Budget for FY1999-2000]

　2,052,000 Yen
　(FY 2000; 1,052,000 Yen)

［Abstract］

　This study presents a detection method for polar stratospheric clouds (PSCs) from the Environment Agency of Japan's Improved Limb Atmospheric Spectrometer (ILAS) instrument. The PSC detection method is based on ILAS visible channel measurements in and around the oxygen A absorption band (753-784 nm) and involves linear or nonlinear 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. Finally, a fast and simple method for the identification of possible PSC candidates from ILAS measurements is presented.


［Key Words］

　occultation sensors, nonlinear fitting, transmittance, spectrum, oxygen