introduction into the absorption channels
DESCRIPTION
Introduction into the Absorption Channels. Description of characteristics and content of the CO2 channel: Ch11: 13.4 . Contact person: Veronika Zwatz-Meise [email protected] Version 1.0. 13 July 2004. All MSG channels. Channel 01:VIS 0.6 Channel 02:VIS 0.8 - PowerPoint PPT PresentationTRANSCRIPT
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Introduction into the Absorption Channels
Description of characteristics and content of the CO2 channel:
Ch11: 13.4
Contact person:Veronika [email protected] 1.0. 13 July 2004
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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)
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„CO2 channel“
Ch11: 13.4 m
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Sun radiation Earth radiation
Ch11: 13.4
Wavelength (micron)
Watt/m2 andmicron
Ozone
Carbondioxid
Watervapour
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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
only VIS
VIS +IR
only IR
• 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 radiationWatt/m2
andmicron
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• Ch11 is in the wing of the CO2 absorption band around 15 m
EnergyspectrumSource:EUMETSAT
Ch11
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Maximal signal from around 870 hPaWeighting
functionsSource:EUMETSAT
8Figure 3d
Maximal signal from around 820 hPaWeightingfunctionsSource:EUMETSAT
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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
10Ch11:13.4
11Ch09:10.8
12Ch10:12.0