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Initial Siting Plans for OOI Irminger Sea Array

Initial Siting Plans for OOI Irminger Sea Array. Matthias Lankhorst Scripps Institution of Oceanography. Recap. “Final Network Design” (FND, 2009) is defining document for initial plans, detailed implementation is in “Site Characterization White Paper”.

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Initial Siting Plans for OOI Irminger Sea Array

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  1. Initial Siting Plans forOOI Irminger Sea Array Matthias Lankhorst Scripps Institution of Oceanography

  2. Recap “Final Network Design” (FND, 2009) is defining document for initial plans, detailed implementation is in “Site Characterization White Paper”. Four moorings in triangular array: one corner has surface and profiler moorings, the other two corners one flanking mooring each

  3. Implementation of FND How large should triangle be? Where should triangle be? How should triangle be oriented? Outline: Some OOI Science and Engineering Current plans for 1, 2, 3 Options to modify 2, 3 to align with OSNAP Minor update to 1

  4. Some OOI Systems Engineering Basics • All documents under configuration control • “Engineering change request” (ECR) required to make changes, then review by configuration control board for approval or rejection. • Present plan for Irminger sites is controlled. • OOI organisations are willing to submit an ECR if this workshop presents a better plan.

  5. OOI Science Themes Ocean-Atmosphere Exchange Climate Variability, Ocean Circulation, and Ecosystems Turbulent Mixing and Bio-Physical Interactions Coastal Ocean Dynamics and Ecosystems Fluid-Rock Interactions and Sub-Seafloor Biosphere Plate-Scale Geodynamics

  6. Coming next: Current Plans

  7. How large should triangle be? • Science goal is to characterize mesoscale eddy field, therefore triangle size should be typical eddy size. • Four methods to estimate eddy size: • Theory of baroclinic instability (Eady), using first Rossby radius of deformation • Lagrangian length scale computed from surface drifter data • Along-track decorrelation scale from satellite altimeter • Mooring analyses (Xue Fan – see poster!)

  8. Baroclinic Instability (Theory by Eady) • Fastest-growing instabilities have sizes of 2-3 times radius of deformation • Ergo ~20 km for Irminger Sea

  9. Lagrangian Length Scale • Surface Drifters • Computational method to derive size of “wiggles” in trajectories • Irminger Sea: ~35 km

  10. Along-track Decorrelation from Altimetry • Satellite altimeter measures sea surface height • Decorrelation along track is typical eddy size • Here: ~30 km

  11. How large should triangle be? • Mooring analyses – poster by Xue Fan • Anticyclone radii typically 10-20 km for those originating off Greenland • Current OOI plan has 20 km side length, but was based on first baroclinicRossby radius only • Separation surface mooring to profiler mooring 4.5 km (1.5 times water depth) for technical reasons

  12. Where should triangle be? Central Irminger Sea Understood as center of circulation (offset from geometric center) Surface: merged “MDOT” products (mean dynamic ocean topography Depth: mapped Argo float velocities, or MDOT plus mapped Argo hydrography

  13. Where should triangle be? • Mean dynamic ocean topography from combination wind, altimeter, surface drifters • Streamlines of geostrophic surface circulation • Used to define “center” of gyre circulation

  14. Where should triangle be? • Gyre center is at same location at depth as it is at surface. • Seen from mean density field referenced to either: • MDOT • Mapped Argo velocity

  15. How should triangle be aligned? • No obvious preference from science goals • Align with other existing observations • Here: Altimetry satellite tracks (T/P, Jason)

  16. Coming next: Potential Modifications

  17. Instead, Align OOI Array with OSNAP Line: Would like to increase triangle side lengths from 20 to 30 km to account for additional eddy size information (Lagrangian length scale) Rotate triangle such that one side is on OSNAP line OOI would like to be at the location where OSNAP line crosses center of gyre Can have three moorings on OSNAP line: surface mooring, profiler mooring nearby, one flanking mooring

  18. Possible OOI Array on OSNAP Line

  19. Possible OOI Array on OSNAP Line • Presently conflict with CIS or LOCO moorings, others? • Options for configuration around OOI array: • On OSNAP line • Subset of moorings on grid This discussion will happen tomorrow, but think and talk about it and come prepared !

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