These pages provide near real time images of aerosol loading in the Adriatic Sea region, derived from the AATSR (on board ENVISAT) and HIRDLS (on board AURA) instruments.
AATSR provides column aerosol optical depth and effective radius (derived from the ORAC retrieval scheme) at a horizontal resolution approximately 1 x 1 km. This data is measured between 8:30 and 10 am local time over the ADRIEX area each day, with a repeat cycle of 3 days. The AATSR nadir tracks for each day of the ADRIEX campaign are shown here.
HIRDLS provides height resolved (at approximately 1 km resolution) maps of aerosol extinction, with a lower altitude of 6 km. The standard horizontal resolution is nominally 450 x 450 km, or when operating in the narrow swath mode (matched to the width of the Adriatic) 50 x 450 km.
Both data sets cover the area between 5 degrees and 30 degrees
east in longitude, and 35 degrees and 45 degrees north in latitude,
Aura spacecraft launched.
Access to NRT AATSR data via the ESA rolling archive started.
ADRIEX web-page prototype put on line.
HiRDLS data will not be available for the ADRIEX campaign due to an unidentified problem with the instrument which has delayed data collection.
AATSR processing is now working and data should begin to appear on this site within the next 24 hours.
Daily updates of AATSR images begun.
ESA rolling NRT archive of AATSR data is not being updated. Updates will not be possible until the archive is active again.
ESA rolling archive is fixed.
ESA (Kiruna) rolling archive is down again.
The Kiruna archive is operational again. New maps will be placed on the web site overnight.
The data display page has been reordered with raw radiance maps for both visible and infra red channels appearing first, followed by the particle type, optical depth and radius estimates. This has been done as the retrieval of optical depth and particle radius is untested on AATSR data and the results show some dubious features.
Two important improvements have been made to the retrieval over the past day.
Firstly, the sunglint area on the right hand side of the images (which cause anomolously high optical depths) have been removed.
Secondly, MODIS surface albedo values are now being used to perscribe the land surface albedo, resulting in much better retrievals over land.
There should be a noticable improvement in the quality of the images from the today onwards.
A quick comparison between the optical depth at 0.55 microns seen by the Venise AERONET station and the AATSR retrieval has been done. Click here for details
Maintained by Gareth Thomas