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0.9.0
S-04
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February 2007
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Automatic notification by e-mail
of "exceptional SO2 concentrations" made public. The details of this
service have not yet been incorporated in the on-line product information.
Due to the interference between the absorption signals of SO2 and ozone,
there are quite a lot of artifacts at high SZA, giving rise to "false
notifications". An improved background correction, to get rid if these artifacts,
is under investigation.
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November 2006
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Added a new Volcano region, to cover three remaining volcanoes with a last
known eruption after 1800 in Turkey and Syria. This new region has number
5, and inserting it required renumbering most regions. Where necessary data
files and images have been updated accordingly. There are now 42 volcano and
11 air quality regions.
Update of the on-line product information, and offering the
possibility to download that as one printable document; see the
Documents section.
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September 2006
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Start of the Near-real time processing service, providing data and images
to the website; the notification of exceptional SO2 concentrations is not
available yet.
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June 2006
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Complete re-analysis and re-plotting of all data on the website
(Sept. 2004 - Jan. 2006) because of an improved background
correction for the SO2 slant column.
At the same time, the FRESCO cloud cover fraction is included in the data
product and as images on the website, to assist interpreting the results.
All data files (ASCII and HDF) and all images are therefore renewed. The
product information web pages and the pages presenting the data have been
adapted accordingly.
Note that these improvements have changed the format of both the
ASCII and the HDF data files.
The documents that can be downloaded from the
Downloadable documentation page are not
yet updated to version 0.9.
Later data additions for this version:
- Slant column data and images for 2006: February, March, April
- Colour scale of cloud fraction plots improved.
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0.8
S-03
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November 2005
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Changes affecting only the ASCII data files of the SCD data
at orbit coordinates:
- Improved data file header (in preparation for addition of VCD data)
- Correction of the "relative azimuth angle" (error in previous version)
This does not affect the HDF data files or the images created
before; they remain version 0.7.
Other updates with this version:
- Correction of the names of two regions that got mixed up
- Added slant column data and images for October 2005
Later data additions for this version:
- Slant column data and images for 2005: November and December;
for 2006: January.
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0.7
S-02
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October 2005
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Full Volcanic & Air Quality SO2 Archive Services set up, with:
- Data files and images (daily, 3-day composites, monthly) of
the SO2 slant column for September 2004 to August 2005
- 12 region defined for the Air Quality SO2 Service
- Improved background correction
- Improved web access to the different archives
- More extensive product information
- Initial setup of criteria for the Notification Service of exeptional
SO2 emissions (not yet on the website)
Updates:
- SO2 slant column data and images of September 2005 added
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0.6
S-01
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December 2004
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January 2005
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Prototype Volcanic SO2 Archive Service set up, with:
- Data of months September to November 2004 processed and plotted
- Special case page: Grímsvötn volcano eruption (1-2 Nov. 2004)
- Correction of background SO2 levels applied to the
DOAS retrieval of SO2 slant columns
- Preliminary product information
- 41 regions, with lists and plots of volcano locations
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S-00
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mid 2004 and before
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Preliminary data processing from GOME and SCIAMACHY for 2000 to mid 2004,
without any correction for the background SO2 levels; these data sets and
images will be replaced by new processing.
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