Changes between Version 26 and Version 27 of doc/app/initialization_parameters

Timestamp:

Sep 13, 2010 2:49:03 PM (16 years ago)

Author:

kanani

Comment:

--

doc/app/initialization_parameters

@@ -219 +219 @@
 Allowed values are '' 'dirichlet' '' (p(k=nz+1)= 0.0) or '' 'neumann' '' (p(k=nz+1)=p(k=nz)).\\\\
 Simultaneous use of Neumann boundary conditions both at the top and bottom boundary ([#bc_p_b bc_p_b]) usually yields no consistent solution for the perturbation pressure and should be avoided. Since at the bottom boundary the Neumann condition  is a good choice (see [#bc_p_b bc_p_b]), a Dirichlet condition should be set at the top boundary.
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#bc_pt_b '''bc_pt_b''']
+}}}
+{{{#!td style="vertical-align:top"
+C*20
+}}}
+{{{#!td style="vertical-align:top"
+'dirichlet'
+}}}
+{{{#!td
+Bottom boundary condition of the potential temperature.\\\\
+Allowed values are '' 'dirichlet' '' (pt(k=0) = const. = [#pt_surface pt_surface] + [#pt_surface_initial_change pt_surface_initial_change]; the user may change this value during the run using [#user-defined] code) and '' 'neumann' '' (pt(k=0)=pt(k=1)). 
+When a constant surface sensible heat flux is used ([#surface_heatflux surface_heatflux]), '''bc_pt_b''' = '' 'neumann' '' must be used, because otherwise the resolved scale may contribute to the surface flux so that a constant value cannot be guaranteed.\\\\
+In the coupled atmosphere executable, '''bc_pt_b''' is internally set and does not need to be prescribed.
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#bc_pt_t '''bc_pt_t''']
+}}}
+{{{#!td style="vertical-align:top"
+C*20
+}}}
+{{{#!td style="vertical-align:top"
+'initial_gradient'
+}}}
+{{{#!td
+Top boundary condition of the potential temperature.\\\\
+Allowed are the values '' 'dirichlet' '' (pt(k=nz+1) does not change during the run), '' 'neumann' '' (pt(k=nz+1)=pt(k=nz)), and '' 'initial_gradient' ''. With the '' 'initial_gradient' ''-condition the value of the temperature gradient at the top is calculated from the initial temperature profile (see [#pt_surface pt_surface], [#pt_vertical_gradient pt_vertical_gradient]) by bc_pt_t_val = (pt_init(k=nz+1) - pt_init(k=nz)) / dzu(nz+1).
+Using this value (assumed constant during the run) the temperature boundary values are calculated as 
+
+      pt(k=nz+1) = pt(k=nz) + bc_pt_t_val * dzu(nz+1)
+
+(up to k=nz the prognostic equation for the temperature is solved).
+When a constant sensible heat flux is used at the top boundary ([#top_heatflux top_heatflux]), '''bc_pt_t''' = '' 'neumann' '' must be used, because otherwise the resolved scale may contribute to the top flux so that a constant value cannot be guaranteed.
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#<insert_parameter_name> '''<insert_parameter_name>''']
+}}}
+{{{#!td style="vertical-align:top"
+<insert type>
+}}}
+{{{#!td style="vertical-align:top"
+<insert value>
+}}}
+{{{#!td
+<insert explanation>
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#<insert_parameter_name> '''<insert_parameter_name>''']
+}}}
+{{{#!td style="vertical-align:top"
+<insert type>
+}}}
+{{{#!td style="vertical-align:top"
+<insert value>
+}}}
+{{{#!td
+<insert explanation>
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#<insert_parameter_name> '''<insert_parameter_name>''']
+}}}
+{{{#!td style="vertical-align:top"
+<insert type>
+}}}
+{{{#!td style="vertical-align:top"
+<insert value>
+}}}
+{{{#!td
+<insert explanation>
 }}}
 |----------------