SO2 data and alert service
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Time coverage of the data Data archives Daily data at orbit coordinates Daily data at grid coordinates Monthly average data Exceptional SO2 concentrations or: Alerts of SO2 events ?? Overview of alert cases [to come]

Time coverage of the data The following table provides an overview of the data sets of SACS, with the time period covered by the data sets, as well as the data sets planned for use in the (near) future, listed per satellite instrument. The date between brackets in the off-line data archive column is the date of the first available data. instrument     data products near-real-time processing and notification off-line data archive [start = first data day] nrt data archive operational notifications SCIAMACHY     SO2 column     Aerosol index   May 2009 - Mar 2010 --   Sep 2006 --   Feb 2007 [n/a]   Jan 2004 - Oct 2009 -- [start:  02 Aug. 2002] OMI     SO2 column     Aerosol index   Jul 2009 - Mar 2010 Jul 2009 - Mar 2010   Oct 2007 July 2008   -- [n/a]   Aug 2004 - Oct 2009 -- [start:  17 Aug. 2004] GOME-2     SO2 column     Aerosol index   May 2009 - Mar 2010 --   Feb 2008 --   -- [n/a]   Jan 2007 - Sep 2009 -- [start:  04 Jan. 2007] IASI     SO2 column     Aerosol flag   -- --   -- --   -- [n/a]   -- -- [start:  ... 2007] Remarks: an entry "--" means that that data set is not yet available an entry "[n/a]" means "not applicable"   Missing data in the SO2 off-line data archive The satellites carrying the instruments perform 14 or 15 orbits per day. It happens that for one or more of these orbits data is missing, either because the instrument did not measure anything, or because the measurement is of too low quality for a reliable retrieval. This missing data leads to gaps in the plots of the daily data. For some geographic regions the web pages accessing the data archive will then show empty pictures. There are also days with no data at all, again because of lack of measurements of lack of the quality of these measurements. For these days there will be no data in the archive at all, and the web pages accessing the data archive will show a message. The following tables lists whole days without any SO2 data in the off-line data archive, i.e. for which no maps are shown. The first day for which off-line archive data is available is given above. Note that this table is maintained by hand and may thus be incomplete. Year SCIAMACHY OMI GOME-2 IASI Month Days Month Days Month Days Month Days 2009 August June April March January 10 04,16 07,08 31 01-03 [none] [none] September February January 08-11 17 29 -- -- 2008 December 19-31 September 28,29 March January 20 17,18 -- -- 2007 December September 02-04 25-27 [none] [none] September April March January 18-19 09, 21-25 03-05 01-03 -- -- 2006 December November September May April January 13-15 29 08-10 26 06-08, 17-19 14 March February 01-02 28 [n/a] [n/a] [n/a] [n/a] 2005 May January 12 01-02 [none] [none] [n/a] [n/a] [n/a] [n/a] 2004 December November October September June May January 20-31 17 01 23 18-28 09 01-03 December November September August 01 19-30 02, 05 01-16, 18-19, 22 [n/a] [n/a] [n/a] [n/a] 2003 -- -- [n/a] [n/a] [n/a] [n/a] [n/a] [n/a] 2002 -- -- [n/a] [n/a] [n/a] [n/a] [n/a] [n/a]

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