new l2p and l3 at mf/cms p.leborgne, f.orain, a.marsouin, h.roquet mf/dp/cms, lannion

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 (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

…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