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Absorbing Aerosol Index

 
   
 
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page last modified:
30 June 2010
     

The Absorbing Aerosol Index (AAI) indicates the presence of elevated 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 AAIs provided here are derived from the reflectances measured by GOME-1 at 335 and 380 nm, from the reflectances measured by OMI at 354 and 388 nm, and from the reflectances measured by SCIAMACHY and GOME-2 at 340 and 380 nm. The pictures below present the most recent AAI measurements obtained by SCIAMACHY and GOME-2. Below these there are links to all the aerosol data products that are currently available.

Latest results from SCIAMACHY and GOME-2

Latest Absorbing Aerosol Index (AAI) results obtained by SCIAMACHY (left) and GOME-2 (right)

Archives

The GOME-1 AAI is available from July 1995 to December 2000. Currently, degradation of the GOME UV channels prevents derivation of the AAI for more recent years.

The SCIAMACHY AAI is derived daily since July 2002. Sunglint situations and solar eclipse events are identified and flagged, and observations with too high solar zenith angles are filtered out. The algorithm corrects for the radiometric calibration problem of SCIAMACHY. Due to radiometric degradation of the SCIAMACHY UV channels, the AAI values used to be anomalously high for data measured since about the end of 2004. This problem has been solved and current data can be used without restrictions.

The OMI AAI is available since October 2004 and runs in near-real-time. Sunglint situations are filtered out.

The GOME-2 AAI has become fully operational since January 2010. Data are available from 2007 on.


 
 

SCIAMACHY Absorbing Aerosol Index
AAI monthly images:
 
AAI monthly data files:
 
AAI daily gridded data:
 
AAI daily level-2 data:
 
AAI daily images:
 
AAI daily log files:
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The SCIAMACHY daily data are available in two flavours:

  • Gridded global daily data for users that are familiar with the TOMS AAI data format

  • Level-2 data with AAI, time, and geolocation information (ASCII data format)

Reprocessed SCIAMACHY AAI data based on level-1 data processor versions SCIA/6.02 and SCIA/6.03, including the official m-factor correction and an additional scan-angle dependent degradation correction, are now available for the entire mission.


22 January 2010: Release of software version 4.1. Most important features:
  • variation of the ozone field is accounted for, now that the algorithm has access to TOSOMI total ozone columns
  • full scan-mirror dependent degradation correction for all measurement modes
  • correction for the obstruction in the FOV for westernmost pixels that was present until the end of March 2003
  • sphericity of the Earth's atmosphere is taken into account
  • improved look-up tables including O2-O2 absorption
  • viewing and solar angles calculated w.r.t. sea level instead of TOA
  • improved sunglint flagging using FRESCO+ cloud information; proper flagging for solar eclipse events

 
Citation
When the data are used in scientific publications, please refer to the following publication:
L.G. Tilstra, M. de Graaf, I. Aben, and P. Stammes, Analysis of 5 years of SCIAMACHY Absorbing Aerosol Index data, Proceedings of the 2007 Envisat Symposium, ESA Special Publication SP-636, 2007. (PDF file)

 

Documentation :

  • M. de Graaf, L.G. Tilstra, and P. Stammes, SCIAMACHY Absorbing Aerosol Index: The scientific product compared to the operational product and TOMS data, Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), ESA Special Publication SP-562, 2004. (PDF file)

  • L.G. Tilstra, M. de Graaf, S. Noël, I. Aben, and P. Stammes, SCIAMACHY's Absorbing Aerosol Index and the consequences of instrument degradation, Proceedings of the Third Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-3), ESA Special Publication SP-642, 2007. (PDF file)

  • L.G. Tilstra, M. de Graaf, I. Aben, and P. Stammes, Analysis of 5 years of SCIAMACHY Absorbing Aerosol Index data, Proceedings of the 2007 Envisat Symposium, ESA Special Publication SP-636, 2007. (PDF file)

 

 

GOME-2 Absorbing Aerosol Index

AAI monthly images:
 
AAI monthly data files:
 
AAI daily images:
 
AAI daily data files:
 
2007  |  2008  |  2009  |  2010
 
2007  |  2008  |  2009  |  2010
 
2007  |  2008  |  2009  |  2010
 
2007  |  2008  |  2009  |  2010  

The data of the GOME-2 Absorbing Aerosol Index are provided by KNMI in the framework of the EUMETSAT Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M SAF).


20 April 2010: All GOME-2 years are covered, near-NRT processing service is up and running.
  • daily and monthly gridded (level-3) data are both available, as well as daily and monthly images
  • flagging for sunglint situations

 
Citation
When the data are used in scientific publications, please refer to the following publication:
M. de Graaf, P. Stammes, O. Torres, and R.B.A. Koelemeijer, Absorbing Aerosol Index: Sensitivity analysis, application to GOME and comparison with TOMS, J. Geophys. Res. 110, D010201, doi:10.1029/2004JD005178, 2005.

 

Documentation :

  • M. de Graaf, P. Stammes, O. Torres, and R.B.A. Koelemeijer, Absorbing Aerosol Index: Sensitivity analysis, application to GOME and comparison with TOMS, J. Geophys. Res. 110, D010201, doi:10.1029/2004JD005178, 2005.

 

 

GOME-1 Absorbing Aerosol Index

AAI monthly images:
 
AAI monthly data files:
 
AAI daily data files:
 
1995  |  1996  |  1997  |  1998  |  1999  |  2000
 
1995  |  1996  |  1997  |  1998  |  1999  |  2000
 
1995  |  1996  |  1997  |  1998  |  1999  |  2000
 

 
Citation
When the data are used in scientific publications, please refer to the following publication:
M. de Graaf, P. Stammes, O. Torres, and R.B.A. Koelemeijer, Absorbing Aerosol Index: Sensitivity analysis, application to GOME and comparison with TOMS, J. Geophys. Res. 110, D010201, doi:10.1029/2004JD005178, 2005.

 

Documentation :

  • M. de Graaf, P. Stammes, O. Torres, and R.B.A. Koelemeijer, Absorbing Aerosol Index: Sensitivity analysis, application to GOME and comparison with TOMS, J. Geophys. Res. 110, D010201, doi:10.1029/2004JD005178, 2005.

 

 

OMI Absorbing Aerosol Index

AAI daily images:
 
AAI daily level-3 data files:
 
AAI daily NRT level-2 data files:
 
2004  |  2005  |  2006  |  2007  |  2008  |  2009  |  2010
 
2004  |  2005  |  2006  |  2007  |  2008  |  2009  |  2010
 
2004  |  2005  |  2006  |  2007  |  2008  |  2009  |  2010
 

The level-2 product that is provided is the OMI OMAERO product (v003).
 

Documentation :

 

 

Tools

 

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