CEOS EO HANDBOOK – INSTRUMENT SUMMARY
- IASI
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Full Name
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Infrared Atmospheric Sounding Interferometer
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Status
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Operational
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Instrument Agencies
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EUMETSAT , CNES
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Maturity
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Instrument Type
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Atmospheric temperature and humidity sounders  and Atmospheric chemistry
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Geometry
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Cross-track scanning
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Instrument Technology
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Medium-resolution IR spectrometer
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Sampling
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Sounding
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Data Access
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Open Access
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Data Format
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Native and BUFR
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Measurements and Applications
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Measures tropospheric moisture and temperature, column integrated contents of ozone, carbon monoxide, methane, nitrous oxide and other minor gases which affect tropospheric chemistry. Also measures sea surface and land temperature.
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Resolution Summary
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Vertical: 1 - 30 km, Horizontal: 25 km
[Best Resolution: 25000m]
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Swath Summary
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2052 km
[Max Swath: 2052 km]
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Accuracy Summary
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Temperature: 0.5 - 2 K, specific humidity: 0.1 - 0.3 g/kg, ozone, trace gas profile: 10%
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Waveband Summary
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MWIR - TIR: 645 to 2760 cm-1 or 3.62 - 15.5 µm (8461 spectral samples)
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| MWIR (~3.0 µm - ~6.0 µm) |
| TIR (~6.0 µm - ~15.0 µm) |
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Instrument Measurements
Measurements Overview
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| Category | Parameter |
| Aerosols | Volcanic ash |
| Atmospheric Humidity Fields | Atmospheric specific humidity (LT, HT, LS, HS&M, TC)   |
| Atmospheric Temperature Fields | Atmospheric temperature (LT, HT, LS, HS&M) |
| Atmospheric stability index |
| Atmospheric Winds | Wind profile (vertical) |
| Cloud type, amount and cloud top temperature | Cloud cover |
| Cloud top height |
| Cloud top temperature |
| Ozone | O3 Mole Fraction |
| Radiation budget | Long-wave Earth surface emissivity |
| Upwelling (Outgoing) spectral radiance at TOA |
| Surface temperature (land) | Land surface temperature |
| Surface temperature (ocean) | Sea surface temperature |
| Trace gases (excluding ozone) | CH4 Mole Fraction |
| N2O (TC) |
| HNO3 (LT, HT, LS, TC) |
| CO2 Total Column |
| CO Total Column |
| SO2 Total Column |
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Instrument Missions
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