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Geophysical Fluid Dynamics Laboratory Review

Geophysical Fluid Dynamics Laboratory Review. June 30 - July 2, 2009. Ocean Modeling Innovations. Presented by Alistair Adcroft. Numerous developments for i) specific models, ii) all models and iii) laying foundation for the future. Universally applicable Advection schemes Icebergs

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Geophysical Fluid Dynamics Laboratory Review

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  1. Geophysical Fluid Dynamics Laboratory Review June 30 - July 2, 2009

  2. Ocean Modeling Innovations Presented by Alistair Adcroft

  3. Numerous developments for i) specific models, ii) all models and iii) laying foundation for the future Universally applicable Advection schemes Icebergs Sub-ice shelf cavities Thin walls/porous barriers Geometry of straits Meso-scale Eddy Kinetic Energy framework Resolution dependent scaling Grid specifications (Mosaics) Symmetric arrays for nesting (GOLD) Ocean Modeling Innovations • Isopycnal specific • Finite volume pressure gradient (error free) • General coordinates • Regridding/remapping • Continuous isopycnal coordinate • Parameterization • Shear mixing • Internal tides • Channel drag

  4. Icebergs New iceberg model transports land ice from continent out to open ocean to melt Avoids cold-fresh bias around Antarctica (led to excess sea-ice) Lagrangian model of icebergs Exporting fresh cap beyond shelf edge increases ventilation Bottom water significantly younger Iceberg positions with 10 day trails Change in ideal age of bottom water due to inclusion of icebergs Martin & Adcroft, in prep. for OM

  5. Topographic Restrictions 1° resolution → 110 km wide Gibraltar Strait Modify grid metrics to impose representative width (~12 km) Controls transport Improves Med. outflow salt bias Salinity bias at 1500m Restricted grid: Gibraltar strait is 12 km wide Original grid: Gibraltar strait is 110 km wide

  6. One Model, Four Coordinates ``Hybrid” approach remapping to ρ ``True’’ soln (adiabatic) Z* and σ dilute buoyancy anomaly Same numerics for non-layered models White & Adcroft, JCP’08 White, Adcroft & Hallberg, JCP’09 Spurious diffusion can significantly dilute gravity currents

  7. MOM-GOLD evolution GOLD lineage is the main focus of our current research effort GOLD is under development Most likely route to answering the “mixing” and “eddy” questions Generalization of coordinates Allows exploration of coordinate question. e.g., which hybrid combination is most useful for ocean climate? Some issues affecting z-coords also affect hybrid coords if coordinate is poorly constructed A unified code & a single model will happen when appropriate Path forward and timing depend on the results of the coordinate research Cox Code 1960’s MOM1 1990 MOM2 HIM 1995 MOM3 MOM4.0 2000 MOM4.1 2005 GOLD 2010 ? 2015

  8. Geophysical Fluid Dynamics Laboratory Review June 30 - July 2, 2009

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