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C | o Controlling routine for the explicit part of the model |
C | o Controlling routine for the explicit part of the model |
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C | dynamics. |
C | dynamics. |
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C *==========================================================* |
C *==========================================================* |
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C | This routine evaluates the "dynamics" terms for each |
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C | block of ocean in turn. Because the blocks of ocean have |
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C | overlap regions they are independent of one another. |
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C | If terms involving lateral integrals are needed in this |
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C | routine care will be needed. Similarly finite-difference |
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C | operations with stencils wider than the overlap region |
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C | require special consideration. |
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C | The algorithm... |
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C | |
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C | "Correction Step" |
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C | ================= |
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C | Here we update the horizontal velocities with the surface |
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C | pressure such that the resulting flow is either consistent |
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C | with the free-surface evolution or the rigid-lid: |
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C | U[n] = U* + dt x d/dx P |
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C | V[n] = V* + dt x d/dy P |
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C | W[n] = W* + dt x d/dz P (NH mode) |
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C | |
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C | "Calculation of Gs" |
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C | =================== |
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C | This is where all the accelerations and tendencies (ie. |
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C | physics, parameterizations etc...) are calculated |
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C | rho = rho ( theta[n], salt[n] ) |
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C | b = b(rho, theta) |
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C | K31 = K31 ( rho ) |
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C | Gu[n] = Gu( u[n], v[n], wVel, b, ... ) |
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C | Gv[n] = Gv( u[n], v[n], wVel, b, ... ) |
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C | Gt[n] = Gt( theta[n], u[n], v[n], wVel, K31, ... ) |
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C | Gs[n] = Gs( salt[n], u[n], v[n], wVel, K31, ... ) |
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C | |
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C | "Time-stepping" or "Prediction" |
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C | ================================ |
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C | The models variables are stepped forward with the appropriate |
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C | time-stepping scheme (currently we use Adams-Bashforth II) |
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C | - For momentum, the result is always *only* a "prediction" |
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C | in that the flow may be divergent and will be "corrected" |
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C | later with a surface pressure gradient. |
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C | - Normally for tracers the result is the new field at time |
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C | level [n+1} *BUT* in the case of implicit diffusion the result |
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C | is also *only* a prediction. |
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C | - We denote "predictors" with an asterisk (*). |
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C | U* = U[n] + dt x ( 3/2 Gu[n] - 1/2 Gu[n-1] ) |
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C | V* = V[n] + dt x ( 3/2 Gv[n] - 1/2 Gv[n-1] ) |
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C | theta[n+1] = theta[n] + dt x ( 3/2 Gt[n] - 1/2 atG[n-1] ) |
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C | salt[n+1] = salt[n] + dt x ( 3/2 Gt[n] - 1/2 atG[n-1] ) |
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C | With implicit diffusion: |
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C | theta* = theta[n] + dt x ( 3/2 Gt[n] - 1/2 atG[n-1] ) |
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C | salt* = salt[n] + dt x ( 3/2 Gt[n] - 1/2 atG[n-1] ) |
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C | (1 + dt * K * d_zz) theta[n] = theta* |
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C | (1 + dt * K * d_zz) salt[n] = salt* |
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C | |
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C *==========================================================* |
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C \ev |
C \ev |
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C !USES: |
C !USES: |
| 30 |
IMPLICIT NONE |
IMPLICIT NONE |
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