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New L2P and L3 at MF/CMS

Explore the process of merging, analyzing, and correcting ocean data from various sensors to ensure high-quality results with traceability. Daily updates for polar orbiters and geostationary sensors available. Enhancing accuracy for European seas analysis.

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New L2P and L3 at MF/CMS

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  1. New L2P and L3 at MF/CMS P.LeBorgne, F.Orain, A.Marsouin, H.Roquet MF/DP/CMS, Lannion

  2. New L2P L3 • New L2P • L3 in MERSEA • From MERSEA to MyOcean

  3. Next L2P • 2009: hourly SEVIRI and GOES L2?P (at present internal to CMS/MERSEA) GRIDDED or not?

  4. Polar orbiters: • AATSR • NOAA-17 • NOAA-18 • AMSRE • TMI Analysis (L4) Synthesis + Correction L3 Other users? Data available in real time through MERSEA (ftp IFREMER) • Geostationary: • GOES-E • SEVIRI L3 at CMS: Present status in MERSEA Le Borgne et al, 2006, Mersea report

  5. Method (overview) Zone (Atl., global,..) + time window (1day, 3 days,…) Sensor i • Collection • Remapping • Synthesis over time • Correction • Principles: • Synthesize information • Best quality • Traceability at pixel level: • Origin (which sensor) • Original lat lon • Confidence level • SSES • Applied correction (if any) L3 (i), unique per sensor Merging L3 (merged)

  6. 1) Sensor-AATSR Over the last ~10 days 3) Interpolation To fine resolution: Correction of the day 2) Alalysis of the differences On a 5° grid Method : Correction

  7. Method : Merging • A priori hierarchy of sensors • traceability

  8. Buoys NOAA-17 L2Ps ……… L2Ps ..MSG L2Ps AATSR L2Ps UNCORRECTED Buoys L3 Buoys L3 NOAA-17 L3 NOAA-17 L3 ……… L3 ……… L3 ..MSG L3 ..MSG L3 AATSR L3 AATSR L3 comparison validation validation control correction comparison CORRECTED Merged L3 L3: validation overview

  9. L3: validation results over the Atlantic Routine production since 01/01/07 Validation Control

  10. L3: validation results Inter Comparison of OSI-SAF products Comparison with AVHRR18_G

  11. L3: correction validation results SEVIRI-AATSR as a function of time and latitude before correction

  12. L3: correction validation results SEVIRI-ATSR as a function of time and latitude after correction

  13. From MERSEA … • CMS MERSEA database (francoise.orain@meteo.fr) • Available in real time trough the MERSEA ftp site at IFREMER • One year completed by March 2008, • Daily collated for: • Polar orbiters: • AATSR • NOAA-17 • NOAA-18 • AMSRE • TMI • Geostationary: • GOES-E • SEVIRI • Buoys

  14. …to Myocean • MyOcean • Addition of METOP and MODIS SST • Collated down to 0.02 degree resolution • Over the European seas • For fine resolution analysis

  15. Conclusion • Correction with AATSR shows satisfying results in MERSEA • Limitations: • Cloud cover ? • Limited swath • Assumptions: large scale (several degrees)/ slowly varying (several days) errors: not right everywhere • Do need R&D effort • One full year database available next March • MyOcean: prototype in construction

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