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ROSA GRAS MeetingFebruary 2009Matera, Italy
GRAS Monitoring and Validation
GRAS Team @ EUMETSATGRAS Team @ EUMETSAT(contact: Ax[email protected])(contact: [email protected])
Slide: 2
ROSA GRAS MeetingFebruary 2009Matera, 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
Slide: 3
ROSA GRAS MeetingFebruary 2009Matera, Italy
Monitoring: Orbit
Metop orbit (left) and velocity (right) of NRT solution compared to reference one
Slide: 4
ROSA GRAS MeetingFebruary 2009Matera, Italy
Monitoring: Clock
Metop clock of NRT solution against reference solution
Slide: 5
ROSA GRAS MeetingFebruary 2009Matera, Italy
Monitoring: Bending Angles
High altitude bending angle bias (left) and noise (right) against climatology
Slide: 6
ROSA GRAS MeetingFebruary 2009Matera, Italy
Validation: ECMWF
Bending angles against co-located ECMWF data
Slide: 7
ROSA GRAS MeetingFebruary 2009Matera, Italy
Validation: COSMIC
Global bias (left) and noise (right) of GRAS and COSMIC observations
Slide: 8
ROSA GRAS MeetingFebruary 2009Matera, Italy
Validation: COSMIC
Number of co-locations (<300km, <3hours), Note: GRAS reductions on 22.12. and 18.01 are only in this data set
Slide: 9
ROSA GRAS MeetingFebruary 2009Matera, Italy
Validation: COSMIC
Bending angles against co-located COSMIC observations (<300km, <3hour)
Slide: 10
ROSA GRAS MeetingFebruary 2009Matera, 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)
Slide: 11
ROSA GRAS MeetingFebruary 2009Matera, 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.
Slide: 12
ROSA GRAS MeetingFebruary 2009Matera, 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)
