ODYSSEA Global and Regional High Resolution SST products
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1 ODYSSEA Global and Regional High Resolution SST products Emmanuelle Autret, Jean François Piollé, Pierre Tandéo Laboratoire d'océanographie Spatiale, Cersat, Ifremer, France
2 Context MEDSPIRATION / MARCOAST (2005 on going) Develop new innovative high resolution merged SST (resolution: 0.02, daily) Over The Mediterranean Sea, North West Europe, The Galapagos Extented by ESA until 2010 MERSEA ( ) to develop a global analysis and regional fine scale analyses for modellers and downstream services (resolution: 0.1, daily) pre operational New: Brazil, South Africa, The Great Barrier Reef several partners : CMS, Ifremer, MetNo, DMI, CNR, NOCS, CLS, UKMet MyOcean ( ) Sustained and operational production for Global (resolution: 0.1, daily) and North West Europe (resolution: 0.02, daily) operational field of expertise : sensor intercalibration and merging, specific areas, high latitudes, optimal interpolation,
3 Product Global resolution 0.1 Daily 0.02 Daily The Mediterranean Sea Northen Europe shelves Brazil The Great Barrier Reef South Africa Odyssea SST L4 products
4 Odyssea SST L4 products North West Europe The Mediterranean Sea South Africa Brazil The Great Barrier Reef
5 Method GHRSST L2P products Observation quality control, correction (sses), filtering «re mapped» monosensor products Selection based on proximity to analysis time and best quality Pre processing steps «composite monosensor products» (/day /sensor) Correction of large scale bias field against AATSR for each sensor Intercalibrated monosensor products (/day /sensor) Merging of composite files «multisensor composite products» (/day) Optimal interpolation Multi senosor analysed field
6 Method GHRSST L2P products Observation quality control, correction (sses), filtering «re mapped» monosensor products Selection based on proximity to analysis time and best quality Pre processing steps «composite monosensor products» (/day /sensor) Correction of large scale bias field against AATSR for each sensor Intercalibrated monosensor products (/day /sensor) Merging of composite files «multisensor composite products» (/day) Optimal interpolation Multi senosor analysed field
7 Method: Dataset Original resol. Satellite/sensor product Provider 1 km AATSR EUR-ATS_NR_2P MEDSPIRATION/IFREMER ftp://ftp.ifremer.fr/ifremer/medspiration/data 1 km AVHRR EUR-L2P-AVHRR_METOP_A MEDSPIRATION/IFREMER ftp://ftp.ifremer.fr/ifremer/medspiration/data 2 km AVHRR EUR-L2P-NAR17_SST EUR-L2P-NAR18_SST MEDSPIRATION/IFREMER ftp://ftp.ifremer.fr/ifremer/medspiration/data 2 km AVHRR NAVO-L2P-AVHRR17_L NAVO-L2P-AVHRR18_L GDAC/NASA ftp://podaac.jpl.nasa.gov/pub/ghrsst/data 3 km GOES/VISSR OSDPD-L2P-GOES11 OSDPD-L2P-GOES12 NOAA/NESDIS ftp://gp16.ssd.nesdis.noaa.gov/pub/goessst/l2p 9 km MSG-1/SEVIRI EUR-L2P-SEVIRI_SST 10 km AVHRR NAVO-L2P-AVHRR17_G NAVO-L2P-AVHRR18_G 25 km AMSRE USA-RSS-AMSRE-MW-L2-SST MISST/RSS ftp://ftp.misst.org/amsre/swath/nc 25 km TMI REMSS-L2P-TMI MEDSPIRATION/IFREMER ftp://ftp.ifremer.fr/ifremer/medspiration/data GDAC/NASA ftp://podaac.jpl.nasa.gov/pub/ghrsst/data MISST/RSS ftp://ftp.misst.org/amsre/swath/nc
8 Method GHRSST L2P products Observation quality control, correction (sses), filtering «re mapped» monosensor products Selection based on proximity to analysis time and best quality Pre processing steps «composite monosensor products» (/day /sensor) Correction of large scale bias field against AATSR for each sensor Intercalibrated monosensor products (/day /sensor) Merging of composite files «multisensor composite products» (/day) Optimal interpolation Multi senosor analysed field
9 Method: Data selection and correction Data selection Data correction Remapping Night time only Quality confidence Satellite zenital angle Aerosols Specific tuning for each product Error statistics (SSES) Adjustement of reference sensor (AATSR) to buoys Closest neighbour or averaging depending on resolution => superobservations
10 Method: Sampling of mono sensor files (1)
11 Sampling of mono sensor files (2)
12 Sampling of mono sensor files (3)
13 Method GHRSST L2P products Observation quality control, correction (sses), filtering «re mapped» monosensor products Selection based on proximity to analysis time and best quality Pre processing steps «composite monosensor products» (/day /sensor) Correction of large scale bias field against AATSR for each sensor Intercalibrated monosensor products (/day /sensor) Merging of composite files «multisensor composite products» (/day) Optimal interpolation Multi senosor analysed field
14 Method: Sensor intercalibration (1) Spatial and temporal dependence of SST discrepancies between observations from different l2p products Example for one day : histogram of global difference mean with AATSR l2p (collocated data) AMSRE NAR18 m= 0.06 C std=0.52 C m=0.18 C std=0.36 C AVHRR18L m= 0.05 C std=0.42 C GOES11 m= 0.46 C std=0.40 C TMI m=0.24 C AVHRR17G m=0.03 C AVHRR18G m=0.01 C NAR17 m=0.19 C std=0.53 C std=0.32 C std=0.28 C std=0.36 C Need for daily data intercalibration before merging
15 Method: Sensor intercalibration (2) Each day, a large scale bias field between the considered sensor and a reference (currently AATSR) is computed. Method: using anomalies between the sensor to be calibrated and the reference over 10 days, large scale biases are estimated by optimal interpolation. Main steps: Computation of reference SST subskin (AATSR) Aggregation of bias information over 10 days Large scale bias estimate (optimal interpolation) Correction of SST (sensor to be calibrated)
16 Method: Sensor intercalibration (3) Example for one day : estimated correction to be applied to SST values
17 Method GHRSST L2P products Observation quality control, correction (sses), filtering «re mapped» monosensor products Selection based on proximity to analysis time and best quality Pre processing steps «composite monosensor products» (/day /sensor) Correction of large scale bias field against AATSR for each sensor Intercalibrated monosensor products (/day /sensor) Merging of composite files «multisensor composite products» (/day) Optimal interpolation Multi senosor analysed field
18 Method: multi sensor file sampling Proximity to analysis time This merged intercalibrated multi sensor product is also distributed on ftp. Source of data
19 Method GHRSST L2P products Observation quality control, correction (sses), filtering «re mapped» monosensor products Selection based on proximity to analysis time and best quality Pre processing steps «composite monosensor products» (/day /sensor) Correction of large scale bias field against AATSR for each sensor Intercalibrated monosensor products (/day /sensor) Merging of composite files «multisensor composite products» (/day) Optimal interpolation Multi senosor analysed field
20 Method: optimal interpolation Background: daily climatology (Pathfinder V5 5day climatology filled and averaged on a 1 x1 grid and interpolated in time) Structure function modeled by gaussian functions Correlation scales in X and Y: ~ Rossby radius (bounded by 20 km and 80 km), isotropic. In time: 2 days
21 Analysed field
22 Data access Links to : ODYSSEA documentation FTP and OpenDAP access monitoring tools: Real time maps of SST fields, SST gradients, intermediate products, and comparisons with other products available on:
23 On going work The current system provides high resolution SST fields : In accordance with in situ observations (not used by the system) In accordance with OSTIA using a similar data set With a good gradients restitution despite the optimal interpolation Nevertheless, improvements can be done on several pre processing and method weak points: Weaknesses Intercalibration exclusively based on AATSR data No temporal processes (no dynamic model) Data preprocessing Improvements In test: methodology for an alternative to AATSR. The method consists in constructing a reference not only from AATSR data but using all available sources New analysis scheme for multisource data and continuous time assimilation (given by Kalman Filter), (PhD student, Pierre Tandeo ) Improvement of data selection and aggregation (data preprocessing software fully recoded)
24 Plans Sustain current products : Global, The Mediterranean, North West Europe New products: Brazil, South Africa, The Great Barrier Reef Improve the chain of operation new processing environment, redundancy Processing fully recoded and optimized Include improved points Reprocess over Medspiration era (Mediterranean )
25 Monitoring tools (some examples) Comparisons between ODYSSEA L4 and other L4 products (gradients) ~ 10 km ~ 5 km ~ 8 km deg C / km
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