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GCOS SST WG plans

GCOS SST WG plans. Nick Rayner OOPC-12, 2 nd May 2007. Executive Committee. Tom Smith, NOAA (Co-chair) Nick Rayner, Met Office (Co-chair) Ken Casey, NOAA Alexey Kaplan, LDEO Liz Kent, NOCS Dick Reynolds, NOAA Ed Harrison, PMEL Craig Donlon, Met Office. Outline Terms of Reference.

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GCOS SST WG plans

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  1. GCOS SST WG plans Nick Rayner OOPC-12, 2nd May 2007

  2. Executive Committee • Tom Smith, NOAA (Co-chair) • Nick Rayner, Met Office (Co-chair) • Ken Casey, NOAA • Alexey Kaplan, LDEO • Liz Kent, NOCS • Dick Reynolds, NOAA • Ed Harrison, PMEL • Craig Donlon, Met Office

  3. Outline Terms of Reference • To record and evaluate the differences among historical and near real time SST and SST/SI analyses • To identify the sources of differences in the analyses • On the basis of comparison of those differences with the expected climate signals in the SST patterns, to recommend actions needed to ensure the quality and consistency of the SST and SST/SI analyses • To establish criteria to be satisfied by SST and SST/SI analyses to ensure the quality and consistency required by the Global Climate Observing System (GCOS) • Liaise with all appropriate bodies • To report annually to AOPC and OOPC on progress and recommendations

  4. Outline plan • Agreed set of diagnostics • Initial set of analyses and input data • Host website • Data formats and inter-comparison tools • Communication plan • Turning the differences and similarities we discover into useful information for users

  5. Agreed set of diagnostics • Initial phase: • Time series of global and hemispheric anomalies • Time-latitude sections of anomalies • Fields of standard deviation, linear trend and lag1 correlation • Follow on phase: • Maps of RMS differences between fields • Time averaged difference maps • Time series for selected regions and a small selection of GHRSST diagnostic data set sites • Spatial autocorrelations.

  6. Initial set of analyses • Kaplan et al • HadISST1 • NOCS SST analysis • ERSST • AVHRR Pathfinder • OIv2 • Daily OI SST • OSTIA Plus input data, including ICOADS and HadSST2

  7. Host website • GHRSST-PP Reanalysis Long Term Stewardship and Reanalysis Facility: http://ghrsst.nodc.noaa.gov/

  8. Data formats and inter-comparison tools • NetCDF-3 allows use of pre-existing data comparison tools, such as Ferret • Compatible with GHRSST-PP fields • Matlab and ASCII formats will also be maintained

  9. Communication plan • Draft and agree a document based on this presentation and feedback [June 2007] • Create an email contact list of other international SST analysis colleagues • Send document with invitation to participate [end of August 2007] • Once we have initial results, widen the net and publicise to other users at appropriate meeting • Explore possibility of a short paper or report.

  10. Creating useful information for users • Spread of different analyses gives initial indication of structural uncertainty • Later propose to • Explore differences in input data and QC techniques • Apply different analysis techniques to the same data • Need to carry out a user requirements exercise to find out what our users are trying to do and so what they need from us.

  11. Liaison with appropriate bodies • GHRSST-PP • WCRP WGNE/WGSF SURFA project on common SST issues

  12. Meeting of the SST/SI WG • Currently discussing dates for meeting of the whole WG to discuss progress and points of common interest • Fall AGU?

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