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GOME & SCIAMACHY Absorbing Aerosol Index
Please notice, ENVISAT instruments are currently not sending any data. Check the ESA ENVISAT page for latest news.
The Absorbing Aerosol Index (AAI) is a differential spectral index to identify the presence of elevated UV-absorbing aerosols in the Earth's atmosphere. The aerosol types that are mostly seen in the AAI are desert dust and biomass burning aerosols. The AAI works equally well over land and sea surfaces and also in the presence of clouds. The AAIs provided here are derived from the reflectances measured by GOME and SCIAMACHY at 340 and 380 nm.
Example result / latest result |
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| Satellite: | ESR-2, ENVISAT (ESA) |
| Instrument(s): | GOME-1, SCIAMACHY (planned GOME-2) |
| Instrument/algorithm PI: | M. de Graaf (KNMI) |
| Contact details: | graafdem[at]knmi.nl |
| Parameter(s): | AAI |
| Aerosol algorithm: | SC-AAI |
| Cloud screening: | n/a |
| Aerosol model: | 340/380 nm index |
| Retrieval assumptions: | constant surface albedo at index range |
| Retrieval limitations: | High solar zenith angle (>85o), sunglint areas (flagged) |
| Spatial, temporal coverage: | GOME-1: 1995-2003, global and SCIAMACHY 2002-present / global NRT and off-line |
| Spatial, temporal resolution: | GOME-1: 960 km swath, 320 x 40 km2 (lv2) SCIA: 960 km swath, 60 x 30 km2 (lv2) GOME-1, SCIA: 1x1.25 degree (lv3 gridded) |
| Operations status: | operational / reprocessing |
| Validation status: | TOMS AAI intercomparison |
| Quality control: | degradation monitoring |
| last algorithm version: | GOME-1: v5.0 (05/2011), SCIA: 4.1 (01/2010) |
| last validation: | 2011 |