1. Status of the EUMETSAT GSICS DCC product
S. Wagner, T. Hewison

2. Status of the GSICS VIS/NIR product
GSICS DCC Calibration System v1.1.0 deployed on the EUMETSAT operational system for instrument monitoring
Deseasonalisation + “de-saturation” of the signal in place  see EUMETSAT ATBD for the GSICS DCC implementation (available on the GSICS Wiki)
Available GSICS VIS/NIR products:
Meteosat-8 SEVIRI VIS0.6  started early October 2016 for IODC
Meteosat-10 SEVIRI VIS0.6
Meteosat-9 SEVIRI VIS0.6 dataset available offline
Products in Demonstration Phase

3. Results – Meteosat-9 VIS0.6
After deployment in the OPE monitoring system
Need for reprocessing
Correction of the VIS0.6 w.r.t. Aqua MODIS in agreement with the feedback from cloud community

4. Preliminary results – Meteosat-10 VIS0.6
SEVIRI Solar Channel Calibration system
GSICS VNIR product

5. Preliminary results – Meteosat-10 VIS0.6
SEVIRI Solar Channel Calibration system
GSICS VNIR product
Preliminary results
Consistent drift estimates
Uncertainties almost 5 times smaller
Observed bias is to be investigated as it is larger than expected…

6. Preliminary results – Meteosat-8 VIS0.6
Results need to be analysed
Discrepancies between the two different drift estimates
Observed bias is to be investigated as it is larger than expected

7. Preliminary results – Meteosat-8 VIS0.6
Investigation will look at:
Deseasonalisation (Wrong factors? Residual? Needed at all?)
References values for MODIS (current results obtained for IOCD ≠ ZDS)
SSCC results also require more analysis
GSICS VNIR product
Behaviour after move over IODC seems to be different from the ZDS also for SSCC
SEVIRI Solar Channel Calibration system

8. Where to get the GSICS VNIR products?
NetCDF format
Follows GSICS standards (based on WMO standards + CF conventions)
Updated once per day (Near Real Time + Re-Analysis)
A product user’s manual in preparation
EUMETSAT ATBD available
For NRT + RA  see

9. GSICS VNIR product Currently one unique file for more methods
Global attributes  describe the dataset + its limitations + its origins (traceability, in particular to the version of the datasets used for the processing [reference + monitored instrument])
Dimensions:
1 record per file for Near-Real-Time products
Full time series to date for Re-Analysis products
Individual method results are all available  “Blend” = one additional method
Variables:
central_wavelength = ;
channel_name = "VIS06" ;
date = time_0…N;
method_name = "DCC“, "BLEND" ;
mon_official_offset = Level 1.5 offset_time_0…N;
mon_official_slope = Level 1.5 slope_time_0…N;
mon_offset = method_1_offset_time_0…N, … , method_M_offset_time_0…N;
mon_slope = method_1_slope_time_0…N, … , method_M_slope_time_0…N ;
validity_period = start_time_0…N, end_time_0…N;
weight_method = weight_method_1_time_0…N, … , weight_method_M_time_0…N;

10. Future activities / developments
Collecting user requirements (i.e marine application group  study on deriving water turbidity using SEVIRI data)
Use VIIRS as a new reference in order to process all reflective solar bands available on SEVIRI
Uncertainty analysis still to be done.
Continue through the various steps of the GPPA.
Reprocess the data for the various SEVIRI instruments to provide complete GSICS VNIR datasets to the user community
Support EUMETSAT activities on climate to apply DCC algorithm to support re-calibration of Meteosat First Generation archive
Development of an algorithm for inter-calibration using the Moon as a transfer target  next candidate to add to the GSICS VIS/NIR product.

11. General concept for the GSICS VIS/NIR products
Data extraction
DCC
Data extraction Lunar Cal …
Data input – Ground segment
Data reader + blend processor
Intermediate data
Data processing
Lunar Cal
GSICS VIS/NIR product
Moon
GSICS DCC product
Intermediate products
GSICS Lunar product
EUMETSAT GSICS data server
Planned for end 2017

12. Conclusion
The EUMETSAT GSICS product for VNIR bands has been extended to Meteosat-8 and Meteosat-10
Current products need to be analysed and consolidated
For full disc missions, products available on the EUMETSAT GSICS server
Need to collect feedbacks from the user community!
In 2017, inter-calibration using the Moon as a transfer target
 Next candidate to add to the GSICS VIS/NIR product
 Need to address the question of the blend…
 aside GSICS, implementation of the DCC as a vicarious calibration target in the EUMETSAT vicarious calibration system

13. Thank you

14. Modelling seasonality…
Residual seasonality
Seasonal model ok