Plans for NATL4 Configuration

1
Plans for NATL4 Configuration

• Paul Myers
• Department of Earth and Atmospheric Sciences
• University of Alberta

2
2006 Summary

• NATL4 installed on Westgrid
• NEMO version 1.06
• Forcing CNYR
• 5 13-year experiments performed
• Control similar to B52(?)
• Spatially varying GM
• Default version Held and Larichev
• Visbeck et al. formulation
• Semi-diagnostic assimilation
• Semi-diagnostic and spatially varying GM (Visbeck
  et al.)

3
2006 Summary
PC
PV
4
2006 Summary
5
2006 Summary
PV - PC
Level 18, 382 m
Level 27, 1471 m
6
2007 Plans

• GOAPP Global Ocean-Atmosphere Prediction and
  Predictability
• Part I Ocean assimilation and sea-ice
• New control run with inter-annual forcing (CORE?)
  1993-2005(?)
• Switch ocean assimilation to spectral nudging
  approach
• Initially use traditional North Atlantic
  climatology
• Then merge with high-resolution Labrador Sea
  product
• Focus is the sea-ice fields and the impact of the
  ocean assimilation on the sea-ice

7
2007 Plans

• Part II Sea-ice Assimilation
• Examine background error covariances for model
• Apply simple 1-D sea-ice concentration
  assimilation developed at Canadian Ice Service
• Without ocean assimilation
• With ocean assimilation

8
2007 Plans

• Science Interests
• Freshwater Perturbation experiments
• Fram Strait and CAA
• Potentially one long interannual 1949-2005 run
• EGC and WGC
• General structure, freshwater transport,
  comparison with observations
• ISOW representation and interaction with LSW
• IW transport into the Labrador Sea and its
  variability