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ESA-CCI Sea Ice ECV

ESA-CCI Sea Ice ECV. Stefan Kern*, et al. *) University of Hamburg. CliSAP, ICDC. Integrated Climate Data Centre (ICDC) at CliSAP http://icdc.zmaw.de. Integrated Climate Data Centre (ICDC) - Webportal at http://icdc.zmaw.de

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ESA-CCI Sea Ice ECV

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  1. ESA-CCI Sea Ice ECV Stefan Kern*, et al. *) University of Hamburg. CliSAP, ICDC

  2. Integrated Climate Data Centre (ICDC) at CliSAPhttp://icdc.zmaw.de Integrated Climate Data Centre (ICDC) - Webportal at http://icdc.zmaw.de • Collection of selected, quality controlled data sets relevant for research within Center of Excellence CliSAP/KlimaCampus • Several data access possibilities: file system, http threads-server, ftp-server, OPEnDAP • Data visualisation with Life Access Server LAS • Easy setup of user-groups to exchange results / prototypes internally, if wanted with password protection

  3. Outline • ESA Climate Change Initiative (CCI) • ESA CCI Sea Ice • ESA CCI Sea Ice and SMOS Sea Ice Thickness 05.09.2014

  4. ESA Climate Change Initiative (CCI) - I Initiated by ESA because of the need for co-ordinated sustained satellite observations of geophysical parameters that are key to monitor & predict the Earths‘ climate system Key drivers: • ISCCP-Reports • UN Framework Convention on Climate Change (UNFCCC) • Global Climate Observating System (GCOS) GCOS issued list of so-called Essential Climate Variables (ECV)s, variables that are feasible to retrieve & have a high impact according to UNFCCC requirements. One of these ECVs: Sea Ice

  5. ESA Climate Change Initiative (CCI) - II Taken from presentation at ESA CCI Information Day in Oct. 2009

  6. ESA Climate Change Initiative (CCI) - III Tasks (within first 3 years): • Requirement analysis, data product specification & error characterization • Algorithm intercomparison, validation & selection • Prototyping system and global data products • Product validation and user assessment • (Operational) system specification • Management

  7. Outline • ESA Climate Change Initiative (CCI) • ESA CCI Sea Ice • ESA CCI Sea Ice and SMOS Sea Ice Thickness 05.09.2014

  8. ESA CCI Sea Ice - Overview ESA CCI Sea Ice ECV project Kick-off: December 2011 Duration: 3 years Lead by: NERSC, Norway (Science) & Logica, U.K./Norway Institutions: Norway: NERSC, met.no Finland: FMI U.K.: UCL, University of Cambridge Denmark: DMI, DTU France: IFREMER Germany: MPI-M, University of Hamburg, University of Bremen

  9. ESA CCI Sea Ice – Breakdown of work ESA CCI Sea Ice ECV project structure

  10. ESA CCI Sea Ice - Parameters Provide: Quality controlled, user assessed, validated sea ice concentration (SIC) time series for 1979-today for both hemispheres Quality controlled, user assessed, validated sea ice thickness (SIT) time series for 1993-today for the Arctic Do: Feasibility study about SIT retrieval in the Antarctic, including update of current snow depth on Antarctic sea ice data set

  11. ESA CCI Sea Ice – Key steps WP1 User Requirements Product Specification Error Characterization User consultation • Questionnaire • Documents (e.g. GCOS) • Scientific articles Review of input & validation data • Technically feasible • Temporally feasible • Meets requirements

  12. ESA CCI Sea Ice – Key steps WP2 / Round Robin Best algorithm(s) combination • Satellite data (for SIC & SIT retrieval) • Independent satellite & other data for algorithm selection & validation Algorithms (SIC) • NASA-Team • Comiso-Bootstrap • ASI • OSI-SAF • … many more

  13. ESA CCI Sea Ice – Key steps WP3 SIC & SIT ECV prototype products ECV production system prototype • Best algorithm(s) combination • Data required by the selected approach • Implementation of selected approach • Uncertainty estimation • Generation of ECV prototype product • Test & validation of production chain

  14. ESA CCI Sea Ice – Key steps WP4 Quality assessed SIC & SIT ECV products Quantification of errors Identification of key problem areas to be improved in ESA-CCI phase II • Inter-comparison our products with independent SIC & SIT observations & trend analysis • Long-term stability analysis of our SIC & SIT product including their uncertainties • Usage of our SIC & SIT products in numerical models & analysis of potential improvement • Inter-comparison of our products with model results

  15. Outline • ESA Climate Change Initiative (CCI) • ESA CCI Sea Ice • ESA CCI Sea Ice and SMOS Sea Ice Thickness 05.09.2014

  16. ESA CCI & SMOS - I We learned today: Sea ice thickness (SIT) retrieval using SMOS is feasible SMOS SIT uncertainty can be described properly & is mainly a function of ice temperature & salinity& assumptions made for the retrieval Therefore: SMOS SIT is an important addition to current and future (ESA-CCI) SIT data sets SMOS SIT fills gap at lower SIT range, where Cryosat-II & ICESat-I /-II fail or are likely to fail because of i) observational limitations of the sensors ii) sea ice & snow physics

  17. ESA CCI & SMOS - II SMOS SIT product does not yet meet ECV requirements: Validation still in baby shoes Time series too short Research stadium BUT: Very valuable data set for Arctic SIT inter-comparison studies within WP4 Might turn out as the only data set able to capture Arctic ocean fall freeze-up properly YES, WE WOULD APPRIATE TO RECEIVE DATA: 50 km grid resolution // monthly // physically based uncertainty estimates // RFI flags // SIC // IST // netCDF

  18. ESA CCI Sea Ice – User questionnaire A user questionnaire has been set up • Which sea-ice parameters are how important for you? • For sea ice concentration and sea ice thickness: What are your requirements [today & in the future] in terms of / how important is • - Spatial-temporal resolution / Region / Time period • - Uncertainty budget (accuracy, precision, long-term stability)

  19. ESA CCI key element: Error characterization 5% / decade 5% SIC 5% Representativity and sampling

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