New L2P and L3 at MFCMS

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
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
Method Correction
7
Method Merging

• A priori hierarchy of sensors
• traceability

8
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_at_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
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
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 RD effort
• One full year database available next March

• MyOcean prototype in construction