# Changeset 411 for palm/trunk/DOC/app

Ignore:
Timestamp:
Dec 11, 2009 2:15:58 PM (15 years ago)
Message:

Large scale vertical motion (subsidence/ascent) can be applied to the prognostic equation for the potential temperature

Location:
palm/trunk/DOC/app
Files:
3 edited

Unmodified
Removed
• ## palm/trunk/DOC/app/appendix_a.html

 r376
PA0324
Applying large scale vertical motion is not allowed for ocean runs
• ## palm/trunk/DOC/app/chapter_4.1.html

 r407

R (10) 10 * 0.0

Gradient(s) of the profile for the large scale subsidence/ascent velocity (in (m/s) / 100 m).

This gradient holds starting from the height  level defined by ws_vertical_gradient_level (precisely: for all uv levels k where zu(k) > ws_vertical_gradient_level, w_subs(k) is set: w_subs(k) = w_subs(k-1) + dzu(k) * ws_vertical_gradient) up to the top boundary or up to the next height level defined by ws_vertical_gradient_level. A total of 10 different gradients for 11 height intervals (10 intervals if ws_vertical_gradient_level(1) = 0.0) can be assigned.

Example:

That defines the subsidence/ascent profile to be linear up to z = 1000.0 m with a surface value of 0 m/s. For z > 1000.0 m up to the top boundary the gradient is 0.0 (m/s) / 100 m (it is assumed that the assigned height levels correspond with uv levels).

With an appropriate construction of w_subs the height of the boundary layer z_i can be kept approximately constant.

Attention:
The large scale vertical motion is only applied to the prognostic equation for the potential temperature because it cannot be applied to the momentum equations due to incompressibility. Thus, the model is not mass consistent.

_level

R (10)

10 *  0.0

Height level from which on the gradient for the subsidence/ascent velocity  defined by ws_vertical_gradient is effective (in m).

The height levels have to be assigned in ascending order. The default values result in a profile which is zero everywhere regardless of the values of ws_vertical_gradient. For the piecewise construction of temperature profiles see ws_vertical_gradient.

• ## palm/trunk/DOC/app/chapter_4.6.html

 r407
ws_vertical_gradient I R(10) 10 * 0.0 Gradient(s) of the profile for the large scale subsidence/ascent velocity in ((m/s) / 100 m)
ws_vertical_gradient_level I R(10) 10 * 0.0 Height level from which on the gradient for the subsidence/ascent velocity defined by ws_vertical_gradient is effective (in m).
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