Changeset 411 for palm/trunk/DOC/app/chapter_4.1.html

Timestamp:

Dec 11, 2009 2:15:58 PM (14 years ago)

Author:

heinze

Message:

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

File:

• palm/trunk/DOC/app/chapter_4.1.html (modified) (1 diff)

palm/trunk/DOC/app/chapter_4.1.html

@@ -17249 +17249 @@
 
 
-
- 
+ </tr>
+
+ <tr>
+
+ <td style="vertical-align: top;"> 
+     
+  <p><a name="ws_vertical_gradient"></a><b>ws_vertical_gradient</b></p>
+
+ </td>
+
+  <td style="vertical-align: top;">R (10)</td>
+
+  <td style="vertical-align: top;"><i>10 * 0.0</i></td>
+
+  <td style="vertical-align: top;"> 
+      
+    <p>Gradient(s) of the profile for the large scale subsidence/ascent velocity
+       (in (m/s) / 100 m).&nbsp; </p>
+      
+      <p>This gradient holds starting from the height&nbsp;
+        level defined by <a href="#ws_vertical_gradient_level">ws_vertical_gradient_level</a>
+       (precisely: for all uv levels k where zu(k) &gt;
+       ws_vertical_gradient_level,
+       w_subs(k) is set: w_subs(k) = w_subs(k-1) + dzu(k) * <b>ws_vertical_gradient</b>)
+       up to the top boundary or up to the next height level defined
+       by <a href="#ws_vertical_gradient_level">ws_vertical_gradient_level</a>.
+       A total of 10 different gradients for 11 height intervals (10 intervals
+       if <a href="#ws_vertical_gradient_level">ws_vertical_gradient_level</a>(1)
+       = <i>0.0</i>) can be assigned. &nbsp;
+      </p>
+      
+      <p>Example:&nbsp; </p>
+      
+      <ul>
+      
+        <p><b>ws_vertical_gradient</b>
+= <i>-0.002</i>, <i>0.0</i>,&nbsp; <br>
+
+        <b>ws_vertical_gradient_level</b> = <i>0.0</i>,
+        <i>1000.0</i>,</p>
+      
+      </ul>   
+      
+      <p>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 &gt; 1000.0 m up to the top boundary the gradient is <i>0.0</i> (m/s) / 100 m
+         (it is assumed that the assigned height levels correspond
+         with uv levels).</p>
+            
+       <p>With an appropriate construction of w_subs the height of the boundary layer z_i 
+        can be kept approximately constant.</p>
+      
+   <p><span style="font-weight: bold;">Attention:</span><br>
+
+      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.</p>
+
+
+ </td>
+
+ </tr>
+
+
+ </tr>
+
+ <tr>
+
+ <td style="vertical-align: top;">   
+      
+      <p><a name="ws_vertical_gradient_level"></a><b>ws_vertical_gradient</b>
+      <br><b>_level</b></p>
+
+ </td>
+
+ <td style="vertical-align: top;">R (10)</td>
+
+ <td style="vertical-align: top;"> 
+         
+      <p><i>10 *</i>&nbsp;
+      <span style="font-style: italic;">0.0</span><br>
+      </p>
+
+ </td>
+
+
+ <td style="vertical-align: top;">
+           
+      <p>Height level from which on the gradient for the subsidence/ascent velocity  defined by
+      <a href="#ws_vertical_gradient">ws_vertical_gradient</a>
+      is effective (in m).&nbsp; </p>
+   
+      <p>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 <a href="#ws_vertical_gradient">ws_vertical_gradient</a>.
+For the piecewise construction of temperature profiles see <a href="#ws_vertical_gradient">ws_vertical_gradient</a>.</p>
+      </td>
+
+ </tr>
+