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Introduction into the Window Channels

Introduction into the Window Channels

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Introduction into the Window Channels

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  1. Introduction into the Window Channels Description of characteristics and content of the channels:Ch07: 8.7  Ch09: 10.8  Ch10: 12.0  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. Ch07: 8.7  Ch09: 10.8  Ch10: 12.0  Sun radiation Earth radiation Watt/ m2 and micron Ozone Carbon dioxid Water vapour Wavelength (micron)

  4. 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

  5. Ch07, 09, 10 in window region Therefore: no fundamental attenuation of the radiation through absorption Energy spectrum Source:EUMETSAT Ch07 Ch09 Ch10

  6. Max. signal in the window channels from the surface and lower part of troposphere Weighting functions Source:EUMETSAT Figure 3c

  7. Application areas for the window channels • Recognition of cloud systems because of the thermal radiation of cloud and earth surface • Extraction of high thin Cirrus from the whole cloud systems

  8. Ch07: 8.7

  9. Some characteristica: Ch07: 8.7 • Indicative for high, thin Cirrus cloud • improved recognition of Cirrus • best use through preparation of RGBs and differences • Support for discrimination between ice- and water cloud • From optical point of view (at the time being) no typical new features recognisable

  10. Ch07:8.7

  11. Ch09:10.8

  12. Ch10:12.0

  13. Ch09: 10.8 and Ch10: 12.0 These channels are comparable to the relevant NOAA channels

  14. Sun radiation Earth radiation

  15. Some characteristica: Ch09: 10.8 and Ch10: 12.0 • Usual evaluation of cloud in both channels • Not much difference between the apperance in the three window channels • Ch10 is more sensitive for high thin Cirrus • not easy to recognise through checking by eyes • difference images give information

  16. Ch07: 8.7

  17. Ch09: 10.8

  18. Ch10: 12.0

  19. Split window Ch09: 10.8 and Ch10: 12.0 • Ch10 is more sensitive for high thin Cirrus • not easy to recognise through checking by eyes • difference images give information

  20. Different Absorption of Ice- and Watercloud between 10.8 and 12.0 m Higher absorption in the ice phase in 12.0 Absorption of Ice- and Water cloud After Source: D. Rosenfeld

  21. Examples for visualisation of high Cirrus Differencen of I07, I09, I10 Source: Jochen Kerkmann kerkmann@eumetsat.de

  22. Difference I07 - I09 Angola

  23. Difference I09 - I10 Angola

  24. Difference I07 - I09 S-Atlantic

  25. Difference I09 - I10 S-Atlantic