1. ROSA GRAS Meeting February 2009 Matera, Italy GRAS Monitoring and Validation GRAS Team @ EUMETSAT (contact: Axel.vonEngeln@eumetsat.int)

2. Slide: 2 ROSA GRAS Meeting February 2009 Matera, Italy Overview Monitoring: –performed during operational processing (basic, e.g. # of processed data segments, processor exit status, etc) –performed in parallel to dissemination (comparing orbit and bending angles) Validation: –performed offline against other RO missions, ECMWF

3. Slide: 3 ROSA GRAS Meeting February 2009 Matera, Italy Monitoring: Orbit Metop orbit (left) and velocity (right) of NRT solution compared to reference one

4. Slide: 4 ROSA GRAS Meeting February 2009 Matera, Italy Monitoring: Clock Metop clock of NRT solution against reference solution

5. Slide: 5 ROSA GRAS Meeting February 2009 Matera, Italy Monitoring: Bending Angles High altitude bending angle bias (left) and noise (right) against climatology

6. Slide: 6 ROSA GRAS Meeting February 2009 Matera, Italy Validation: ECMWF Bending angles against co-located ECMWF data

7. Slide: 7 ROSA GRAS Meeting February 2009 Matera, Italy Validation: COSMIC Global bias (left) and noise (right) of GRAS and COSMIC observations

8. Slide: 8 ROSA GRAS Meeting February 2009 Matera, Italy Validation: COSMIC Number of co-locations (<300km, <3hours), Note: GRAS reductions on 22.12. and 18.01 are only in this data set

9. Slide: 9 ROSA GRAS Meeting February 2009 Matera, Italy Validation: COSMIC Bending angles against co-located COSMIC observations (<300km, <3hour)

10. Slide: 10 ROSA GRAS Meeting February 2009 Matera, Italy Validation: Orbit Stability Issues Upper level (60 km) biases (top) and noise (bottom) time series against ECMWF for batch POD process with COD GPS orbits and clocks (GPS week 1501 test period)

11. Slide: 11 ROSA GRAS Meeting February 2009 Matera, Italy Validation: Orbit Stability Issues Upper level biases at 60 km (top) and 40 km (bottom) time series against ECMWF for operational POD process with GSN orbits and clocks (operational data). Note: is within GRAS requirements.

12. Slide: 12 ROSA GRAS Meeting February 2009 Matera, Italy Validation: Orbit Convergence Issue Upper level biases at 40 km time series against ECMWF for operational POD process with GSN orbits and clocks (GPS week 1501 test period). Grey shaded areas indicated degraded data (about 6 % for this period)