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European Service for Ocean Colour

GlobColour Overview and achievements after two years. User Consultation Meeting (Medspiration-5, GlobColour-2). European Service for Ocean Colour. www.globcolour.info. Odile Fanton d’Andon (ACRI-ST). Diagram/illustration. Session 2 – GlobColour Progress 20 November 2007.

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European Service for Ocean Colour

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  1. GlobColour Overview and achievements after two years User Consultation Meeting (Medspiration-5, GlobColour-2) European Service for Ocean Colour www.globcolour.info Odile Fanton d’Andon (ACRI-ST) Diagram/illustration • Session 2 – GlobColour Progress • 20 November 2007 www.globcolour.info

  2. Outline of this presentation User Consultation Meeting (Medspiration-5, GlobColour-2) European Service for Ocean Colour • Background of GlobColour • Phase 1 achievements • Phase 2 achievements • Provision of a long time-series (1997-2007) of consistently calibrated and merged global ocean colour products • Validation and characterisation performed with available in situ observations • Perspective : Pre-operational ocean colour service element of the future EU GMES Marine Core Service July 2002 October 2002

  3. Satisfy emerging demand for validated merged ocean colour derived information Demonstrate the current state of the art in merging together data streams from different ocean-colour sensors: MERIS (ESA), SeaWiFS (NASA), MODIS-AQUA (NASA), (Polder-Parasol CNES) Background of GlobColour Context • ESA DUE project i.e. driven by end users: IOCCG, IOCCP, UK Met-Office, … Objectives • Provide a long time-series (10 years) of ocean-colour information • Demonstrate a global NRT ocean-colour service based on merged satellite data • Put in place the capacity to continue production of such time series inthe future and to prepare for full exploitation of Sentinel 3 (ESA)

  4. ARGANS Background of GlobColour CONSORTIUM ACRI-ST (France) Prime contractor / management Processor / Production University of Plymouth (UK) User requirements follow up/ design justification / merging ARGANS LIMITED (UK) New products / Evolution /merging NIVA (Norway) Validation (DDS) Brockman Consult (Germany) Tools development Web server ICESS (USA), DLR (Germany) & LOV (France) Scientific support

  5. Background of GlobColour GlobColourDUE project – 3 years - 3 phases Phase 1 (2006) : Demonstration of feasibility Phase 2 (2007) : Generation and validation of 10 year time series • Today : Second GlobColour User consultation at NIVA Phase 3 (2008) : Daily delivery of global merged ocean colour products • NRT demonstration • Delivery to operational oceanography user community Towards a sustainable European Ocean Colour service part of the future EU GMES Marine Core Service

  6. Background of GlobColour User’s involvement Users are always involved during the project for consultation, advice andfinal assessment KO+2: Jan. 2006 Generation and review of Requirements Baseline Document, Design Justification File, and Validation Protocol KO+8: July 2006 Participation in the Critical Design Review KO+13: Dec. 2006 User assessment of the Preliminary Product Sets (radiance and biophysical) and selection of final product Participation in the end of phase 1 review (advisors to ESA) andGlobColour User Workshop 1 (LOV) KO+16: Mar. 2007 User meeting at UK Met Office KO+20: July 2007 User meeting at University of East Anglia KO+23: Oct. 2007 User assessment of the Final Product Set (10 years) KO+24: Nov. 2007 Participation in theGlobColour User Workshop 2 (NIVA) KO+36: Nov. 2008 Participation in theGlobColour User Workshop 3 (ESRIN)

  7. Phase 1 (2006) : Demonstration of feasibility • Difficulties • Sensors are not created equal: different designs, calibrations, algorithms, accuracies,…. • Large volumes of data to deal with • Merging procedure should not create biases, discontinuities, artifacts,…

  8. Phase 1 (2006) : Demonstration of feasibility • Sensor characterisation (continued in Phase 2) For validation / characterisation:DDS: Diagnostic Data Set Data Courtesy SeaPRISM [Giuseppe Zibordi, Brent Holben, Doug Vandemark] see Samantha Lavender’s presentation

  9. Phase 1 (2006) : Demonstration of feasibility • Sensor characterisation (continued in Phase 2) Achievement: Statistical uncertainties have been derived and are used for merging

  10. Phase 1 (2006) : Demonstration of feasibility Developing the system • Main modules: • Data acquisition • Pre-processing • Spatial binning • Temporal binning • Merging • QC • Globcolour processor End 2006: System is ready for systematic production

  11. WWW.globcolour.info The European Service for Ocean Colour GlobColour is an ESA Data User Element Project • Data access • Data products • Methods • Data tools • Calendar • About the Project • Workshops and forum GlobCOLOUR Project European Node for global Ocean Colour The GlobColour project is demonstrating an EO based service supporting global ocean carbon cycle research. Through this web portal, the project provides scientists with a long time series of consistently calibrated global ocean colour information.

  12. CHL1 GSM Apr03 CHL2 AVG Apr03 Phase 1 (2006) : Demonstration of feasibility Merging recommendations: Normalized water-leaving radiances: - Statistics are slightly better when using the weighted average than the simple average - Use of the weighted average for the nLw’s Chlorophyll: - GSM01 provides the best fit to in-situ chlorophyll - It has the advantage of providing other products - Pixel-by-pixel error bars can be provided in the future - Produce also weighted average Chlorophyll

  13. Phase 1 (2006) Demonstration of feasibility successfully achieved Presentation of the precursor service • First user’s workshop at LOV, Villefranche, 4-6 Dec. 2006

  14. Phase 2 (2007) Provision of a long time-series (1997-2007) Phase 2 (2007) : Generation and validation of 10 year time series • 1997-2007 time series available at http://www.globcolour.info SeaWiFS MODIS MERIS 97-09 07-12 see Gilbert Barrot’s presentation

  15. Phase 2 (2007) GlobColour products (1997-2007)distributed to the users Global ocean colour data set at 4.6 km resolution covering 1997-2007 daily, weekly, monthly products: • Chlorophyll concentration (Chla) • Diffuse attenuation coefficient @ 490nm (Kd490) • Total Suspended Matter • CDM absorption (aCDM443) • Particle backscattering coefficient (bbp443) • Aerosol Optical Thickness (T865) • Exact normalised water-leaving radiance @ 412, 443, 490, 510, 531, 555, 620nm • Water-leaving radiance @ 670, 681, 709nm • Data quality flags • Cloud fraction • Excess of radiance at ~ 555 nm (turbidity index) (EL555) • Error estimates per pixel for each layer MODIS-only, MERIS-only see Gilbert Barrot’s presentation

  16. Phase 2 (2007) Provision of a long time-series (1997-2007) Some numbers.. More than 25 Tb of input data (level 2) 14 Tb of intermediate and output products 4.5 Tb of distributed data netCDF, JPG/PNG web, ftp, Google-Earth dedicated tools are available (ISIN-PC grids) All Google Earth tools are available (e.g. ruler, places name…)

  17. Phase 2 (2007) Validation • Applying the Validation protocol defined in Phase 1 • Using: • punctual in situ measurements and  • time series obtained from long-term buoy measurements or from regular/ continuous cruises (e.g. ferrybox datasets)  • Validation of FPS merged products: • Focus onchlorophyll-a, diffuse attenuation coefficient, normalised water-leaving radiances (LwN).  • Perspectives on error uncertainties (See A. Mangin/S. Maritorena talks)

  18. Phase 2 (2007) Validation GSM AVW N 175 R2 0.84 RMS 0.21 BIAS 0.04 N 108 R2 0.84 RMS 0.14 BIAS 0.01 N 162 R2 0.90 RMS 0.19 BIAS -0.04 Error characterisation Open ocean : see David Antoine presentation - Based on the match up with the global data set of field data (Chl and nLw’s), the GlobColour FPS is validated. - The GlobColour FPS is definitely qualified and usable for operational uses, such as assimilation into global models (there is a pixel-by-pixel error bar delivered with the GSM Chl), or delivery of GMES services.

  19. Phase 2 (2007) Validation Coastal waters : see Dominique Durand presentation • A better in-situ dataset for coastal case 2 waters is needed (best results from Ferrybox data collection)! • GSM01 merging algorithm seems quite robust over coastal waters • GlobColour merged products show a potential for investigating seasonal to inter-annual variability in coastal zone: should be investigated further ! NIVA-FerryBox CHL monthly mean

  20. Phase 2 (2007) Validation Inter-comparison with other similar initiatives (NASA, REASoN) : see Stephane presentation

  21. Add Sensor Error From Charact. & anc. data Datamerging Input L2 data of Varied format& with no errors estimates netCDF format netCDF format L3 Products per sensor MergedProducts with error estimates Observations Applications See session 4 tomorrow GlobColour The global OC data service in the European Marine Core Service Parallel & consistent with the Medspiration/GHRSST approach Quality control and uncertainty estimation

  22. http://www.globcolour.info/ Thank you for your attention

  23. Monthly Chlorophyll May 2006

  24. Error estimates at pixel level (%) Chla – May 2006 100% 50% 0%

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