Concept information
Preferred term
ILAS II
Definition
- Improved Limb Atmospheric Spectrometer-II (ILAS-II) developed by the Environment Agency of Japan is a sensor to monitor the high-latitude stratospheric ozone and will be aboard the ADEOS II platform(early 2001). The objectives of ILAS-II are to monitor and study changes in the stratosphere which are triggered by emissions of chlorofluorocarbons (CFC), and to evaluate the effectiveness of world-wide emission controls of CFCs. ILAS-II is a spectrometer which observes the atmospheric limb absorption spectrum from the upper troposphere to the stratosphere using sunlight as a light source (solar occultation technique). The spectrometer covers the infrared region (2-13fÊm) and the near visible region (753 to 784nm). ILAS-II was designed to improve observation accuracy and cover wider spectral ranges than ILAS (aboard ADEOS planned for 1996 launch by NASDA) which was based on LAS aboard EXOS-C (Ohzora, ISAS, 1984). ILAS's observations are focused in the high latitude regions because of the geometrical relation of the solar occultation events with the sun-synchronous orbit. From these spectral observations, ILAS-II can measure the vertical profiles of species related to ozone hole phenomena:ozone (O3), nitrogen dioxide(NO2), aerosols, water vapor (H2O), CFC11, methane(CH4), nitrous oxide (N2O), chlorine nitrate (CIO NO2),temperature, and pressure. Characteristics: * Spectral Coverage CH:1 : 7.14 - 11.76mm(1400 - 850cm - 1) CH:2 : 2 - 8mm(5000 - 1250cm - 1) CH:3 : 12.80 - 12.83mm(781 - 779cm - 1) CH:4 : 753 - 784nm * Spatial Coverage(Height) 10 - 60km * Vertical Resolution 1km * Observation Accuracy 5%(1% to ozone) (Processing Error is not included) * Observation Region N56 - 70deg / S63 - 88deg * Spectrometer CH:1 : Grating Spectrometer CH:2 : Prism Spectrometer CH:3 : Grating Spectrometer CH:4 : Concave Grating Spectrometer * Observation Parameters O3,HNO3,N2O,H2O,CFC-11,CFC-12 CIONO2, Aerosols,Pressure and Temperature. Adopted from the Earth Observation Satellite Homepage: "http://www.eoc.nasda.go.jp/guide/satellite/sendata/ilas2_e.html" (en)
Broader concept
- Spectrometers (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/7dcfb92b-2372-41df-8f5a-787f983065b5
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