new l2p and l3 at mf/cms p.leborgne, f.orain, a.marsouin, h.roquet mf/dp/cms, lannion
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New L2P and L3 at MF/CMS
P.LeBorgne, F.Orain, A.Marsouin, H.Roquet
MF/DP/CMS, Lannion
New L2P L3
New L2P L3 in MERSEA From MERSEA to MyOcean
Next L2P
2009: hourly SEVIRI and GOES L2?P (at present internal to CMS/MERSEA)
GRIDDED or not?
L3 at CMS: Present status in MERSEA
Le Borgne et al, 2006, Mersea reportPolar orbiters:-AATSR-NOAA-17-NOAA-18-AMSRE-TMI
Geostationary:-GOES-E-SEVIRI
Analysis (L4)
Other users?Data available in real time through MERSEA(ftp IFREMER)
Synthesis+Correction
L3
Method (overview)
Sensor i1) Collection2) Remapping3) Synthesis over time4) Correction
Merging
L3 (i), unique per sensor
L3 (merged)
Zone (Atl., global,..) + time window (1day, 3 days,…)
Principles:-Synthesize information-Best quality-Traceability at pixel level:
•Origin (which sensor)•Original lat lon•Confidence level•SSES•Applied correction (if any)
Method : Correction
1) Sensor-AATSROver the last~10 days
2) Alalysis ofthe differences On a 5° grid
3) Interpolation To fine resolution:Correction of the day
Method : Merging
A priori hierarchy of sensors
traceability
L3: validation overview
……… L2Ps AATSR L2PsBuoys ..MSG L2PsNOAA-17 L2Ps
AATSR L3Buoys L3 NOAA-17 L3 ……… L3 ..MSG L3UNCORRECTED
Merged L3
AATSR L3Buoys L3 NOAA-17 L3 ……… L3 ..MSG L3
CORRECTED
validation comparison correction
comparison controlvalidation
L3: validation results over the Atlantic
Validation
Control
Routine production since 01/01/07
L3: validation results
Comparison with AVHRR18_G
Inter Comparison of OSI-SAF products
L3: correction validation results
SEVIRI-AATSR as a function of time and latitudebefore correction
L3: correction validation results
SEVIRI-ATSR as a function of time and latitudeafter correction
From MERSEA …
CMS MERSEA database ([email protected])
– 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
…to Myocean
MyOcean– Addition of METOP and MODIS SST
– Collated down to 0.02 degree resolution
– Over the European seas
– For fine resolution analysis
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