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Design and Assessment of the Australian Integrated Marine Observing System

Design and Assessment of the Australian Integrated Marine Observing System. Peter Oke* and Pavel Sakov*^ *CSIRO Marine and Atmospheric Research Centre for Australian Weather and Climate Research ^ NERSC June 2011.

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Design and Assessment of the Australian Integrated Marine Observing System

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  1. Design and Assessment of the Australian Integrated Marine Observing System Peter Oke* and Pavel Sakov*^ *CSIRO Marine and Atmospheric Research Centre for Australian Weather and Climate Research ^ NERSC June 2011

  2. Delivering recommendations to skeptical observational oceanographers is fraught with danger … There’s nothin’ worse than a modeller who reckons they know what they’re talking about … You know you’re in trouble when you start to believe your model …

  3. Outline • Goal: to contribute to discussion about the design of IMOS • Scope of work: limited to shelf and coastal IMOS components • Strategies: • Explicitly consider design aspects for intraseasonal (<60-dy) and interannual (>14-mth) variability • Analysis of signal-to-noise ratios: relevant to observation platforms that are infrequent in time • Correlation footprints • Key Outcomes: • The National Reference Stations provide remarkably good coverage for monitoring interannual variability over the shelf • The regional IMOS mooring arrays significantly improve the coverage on intraseasonal time-scales • Some redundancy in regional mooring arrays

  4. Analysis domain

  5. Datasets • Observed SST -- ¼ degree composites from AVHRR and AMSRE, processed at CMAR-Hobart • Observed SSH – ¼ degree gridded SSH from all altimeters, processed at CMAR-Hobart • Modelled SST, SSH, SSV, … • Bluelink model (Spinup6p8) • Configuration of MOM4p1 • 1/10 degree horizontal resolution • 5-m vertical resolution near surface

  6. SST MODEL OBSERVATIONS Intraseasonal Interannual

  7. SLA MODEL OBSERVATIONS Intraseasonal Interannual

  8. SSU ZONAL MERIDIONAL Intraseasonal Interannual

  9. Observation “footprint” (e.g., Darwin NRS) Interannual Intraseasonal SSH SST

  10. Combined “footprint” for NRSs on interannual time-scales MODEL Observations SSH SST

  11. Combined “footprint” for NRSs plus Regional IMOS moorings NRS + regional IMOS Moorings NRS only Small footprint for velocity

  12. SA-IMOS regional moorings array Intraseasonal SSH Intraseasonal SSV

  13. Footprint of individual moorings Cabbage Patch Mooring Deep Slope Mooring

  14. Footprint of individual moorings

  15. Summary • NRS array provides remarkably good coverage of interannual (>14-m) variability over the shelf • Regional IMOS mooring array significantly improves the coverage for intraseasonal (<60-d) variability • Many regional IMOS moorings provide complimentary information about the circulation

  16. QLD-IMOS regional mooring array

  17. Some moorings are very complimentary

  18. NSW-IMOS regional mooring array

  19. WA-IMOS regional mooring array

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