1. 10-03-2009 SADDU1/13 SCIAVALIG status report: Product website & Quality assessment status Annelise du Piesanie, Ankie Piters

2. 10-03-2009 SADDU Website contains information regarding all registered SCIAMACHY products –Where / how to get these products –The product developer and institution's details –Contains user documents describing products –Contains various validation literature papers & references The central SCIAMACHY product website 2/13

3. 10-03-2009 SADDU www.sciamachy.org 3/13

4. 10-03-2009SADDU AD - Algorithm doc PSD - Product specification doc Av - Availability C - Content Val – Validation status AD - Algorithm doc PSD - Product specification doc Av - Availability C - Content Val – Validation status

5. SCIAVALIG quality criteria Algorithm doc: contains details about the algorithm used - mathematical methods, assumptions, input data, auxiliary data, etc Product Specification doc: contain details about the product for particular release, product format specification, data quality assessment, etc Availability: the data set is generated with one software version for a consecutive period of at least 1 year, and for at least 50% of the orbits in that period, and it is available at no cost Product content: data content - for ex. include headers, version nr, dates, convention for file names, quality flags, certain geophysical data, etc Validation status: can be either validated, partly validated, or demonstrated - Gives information about the completeness of the knowledge of the quality. 10-03-2009 SADDU5/13

6. SCIAVALIG via the product coordinator checks if the criteria for product When all criteria are fulfilled: –100 word summary on the website (iteration between product developer and product coordinator) –SCIAVALIG advises on further validation, monitors validation results, reports on product quality 10-03-2009 SADDU SCIAVALIG quality criteria 6/13 - documentation available (not yet meet the criteria) - ….. meets SCIAVALIG criteria

7. Example: Validation summary for H2O vertical column by IFE/IUP Bremen Comparisons of SCIAMACHY AMC-DOAS water vapour columns V0.9.1 with colocated ECMWF and SSM/I data reveal typically slightly (0.1-0.3 g/cm2) lower SCIAMACHY columns, most likely because the SCIAMACHY data are essentially cloud-cleared (Noël et al., 2005). AMC-DOAS V1.0 shows a similar average bias with respect to SSM/I (Noël et al., 2007). The scatter on such comparisons is quite large (0.5 g/cm2) due to atmospheric variability. Comparisons of monthly mean SCIAMACHY water vapour with ECMWF data show somewhat larger deviations over oceans and desert areas. The estimated retrieval precision of the AMC-DOAS products is better than 0.2 g/cm2 (Noël et al., 2004).Noël et al., 2005Noël et al., 2007Noël et al., 2004 10-03-2009 SADDU SCIAVALIG quality criteria 7/13

8. 10-03-2009SADDU

9. 10-03-2009SADDU Literature overview Register Add literature

10. 10-03-2009SADDU Status of product quality assessments 10/13

11. Some interesting numbers on data requests *..... Product & institute Nr of requests O3 profile – IFE / IUP Bremen18 SO2 column – IFE / IUP Bremen15 CO2 column – IFE / IUP Bremen12 Level 1b data – SRON10 SO2 slant column – BIRA-IASB7 CH4 column – IFE / IUP Bremen6 HCHO column – IFE / IUP Bremen6 CH4 column – SRON/ IUP Heidelberg 5 NO2 trop. column – KNMI /BIRA5 O3 column – KNMI4 NO2 trop. column – IFE / IUP Bremen 4 NO2 column - KNMI / BIRA4 NO2 column – IFE / IUP Bremen4 H2O column – IFE / IUP Bremen4 Aug 2005 – Feb 2009 Product & institute Nr of requests Absorbing aerosol index – KNMI3 Cloud cover fraction – KNMI3 CO column – IFE / IUP Bremen3 BrO column – IFE / IUP Bremen3 CO column - SRON1 NO2 trop. column – Dalhousie /SAO1 BrO profile – MPI Mainz / IUP Heidelberg 1 BrO profile – IFE / IUP Bremen1 OClO slant column – IFE / IUP Bremen 1 UV index – KNMI1 UV dose – KNMI1 NO2 prof. - MPI Mainz/IUP Heidelberg 1 NO2 prof. – IFE / IUP Bremen1

12. SADDU Nr of data requests: Aug 2005 – Feb 2009 Overall - data requests* are increasing!

13. 10-03-2009 SADDU Feel free to register your product on the SCIAMACHY website if you haven’t already done so!! Email: annelise.dupiesanie@knmi.nl Sciavalig email: sciavalig@knmi.nl Central SCIAMACHY product website 13/13