Packages

1
Packages

• Stable definition
• Existing packages
• GM/Redi
• KPP
• Convective adjustment
• Context -gt NASA CAN

2
Directions

• Re-organize algorithm
• generalize time-stepping
• longer time steps (maybe less efficient)
• Conformal cubic sphere
• longer time step
• Rather different wrapper
• Generalize vertical coordinate
• Semi-lagrangian (longer time step)
• Explicit free surface (global sum)

3
Slope Tapering
4
Gent McWilliams Cox Clipping
5
Gent McWilliams DM 95
6
Regular Latitude-Longitude Grid?? ?? 2?/N
Number of points N?N/2 ?x 2?R/N cos(?) ?y
2?R/N ?xpole ? 2??y/N 4?2R/N2
Uniformity of resolution ?xeq/?xpole ?
N/(2?) Ratio of max/min areas Aeq/Apole ?
N/(2?) Aspect ratio ?y/?xpole ? N/(2?)
7
Conformal mapping ofcube to the sphere
Num. points 6?(M?M) 3/8 N2 Ratio ?xmax/?xmin
M1/3 Ratio Amax/Amin ¾M2/3

• Locally orthogonal
• Nearly isotropic
• Unbounded ?xmax/?xmin
• Much better scaling than ?-? grid

8
Conformal cubic sphere128x64
6x32x32
9
Global bathymetry on tiles
S
N
Grid 6x 32x32 (equiv. to 2.8x2.8)
10
Documentation

• Document as we move majority of code into package
  form
• eg. GM/Redi
• Document release (ECCO 1.0)?
• main code in state of flux