UW-NMS Model Numerical Schemes

Hybrid Time Differencing

• DYNAMICS ADVECTION AND CORIOLIS: 2nd order leapfrog/Sadourny (1974) enstrophy conservation
• SCALAR ADVECTION: 6th order Crowley in Flux form
• PRECIPITATION FALL: Foward Upstream
• HORIZONTAL PRESSURE GRADIENT: 2nd order foward/backward
• VERTICAL PRESSURE GRADIENT: 2nd order Crank-Nicholson
• VERTICAL EXNER FUNCTION TENDENCY: 2nd order Crank-Nicholson
• BOUYANCY: forward
• HORIZONTAL TURBULENCE: 2nd order forward
• VERTICAL TURBULENCE: 2nd order Crank-Nicholson
• HORIZONTAL FILTER: 4th order, foward
• VERTICAL FILTER: 6th order, foward
• MICROPHYSICS: Foward, Repaired
• RADIATION: Foward, adjustable space, time frequency
• SOIL: 2nd order Crank-Nicholson

Filtering and Turbulence

• Buoyancy Enhanced Eddy Fiscosity
• Modified 1.5 level TKE closure
• Vertical or Horizontal nth order filter