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Introduction into the Absorption Channels

Introduction into the Absorption Channels. Description of characteristics and content of the CO2 channel: Ch11: 13.4 . Contact person: Veronika Zwatz-Meise zwatz-meise@zamg.ac.at Version 1.0. 13 July 2004. All MSG channels. Channel 01: VIS 0.6  Channel 02: VIS 0.8 

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Introduction into the Absorption Channels

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  1. Introduction into the Absorption Channels Description of characteristics and content of the CO2 channel:Ch11: 13.4  Contact person: Veronika Zwatz-Meise zwatz-meise@zamg.ac.at Version 1.0. 13 July 2004

  2. All MSG channels • Channel 01: VIS 0.6  • Channel 02: VIS 0.8  • Channel 03: NIR 1.6  • Channel 04: MIR 3.9  • Channel 05 WV 6.2  • Channel 06: WV 7.3  • Channel 07: IR 8.7  • Channel 08: IR 9.7  („Ozon“) • Channel 09: IR 10.8  • Channel 10: IR 12.0  • Channel 11: IR 13.4 („CO2“) • Chanell 12: HRV (High Resolution Visible)

  3. „CO2 channel“Ch11: 13.4 m

  4. Ch11: 13.4  Sun radiation Earth radiation Watt/ m2 and micron Ozone Carbon dioxid Water vapour Wavelength (micron)

  5. Comparison of radiation sources sun - earth • For wave length < 5 m solar radiation is dominant • For wave length > 5 m radiation of earth is dominant • Ch01, 02, 03, 12: only sun radiation • Ch04: both: radiation from sun and earth • Ch 05, 06, 07, 08, 09, 10, 11: only thermal earth radiation Sun radiation Earth radiation Watt/ m2 and micron only VIS VIS + IR only IR

  6. Ch11 is in the wing of the CO2 absorption band around 15 m Energy spectrum Source:EUMETSAT Ch11

  7. Maximal signal from around 870 hPa Weighting functions Source:EUMETSAT

  8. Maximal signal from around 820 hPa Weighting functions Source:EUMETSAT Figure 3d

  9. Application areas for the CO2 channel • Qualitative application of images: • No additional features compared to the IR window channels • No special application for qualitative image interpretation (at the time being) • Quantitative applications: • temperature profiles • instability • winds

  10. Ch11:13.4

  11. Ch09:10.8

  12. Ch10:12.0

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