| 1 |
|
| 2 |
%\subsubsection{File {\it input/data}} |
| 3 |
%\label{www:tutorials} |
| 4 |
|
| 5 |
This file, reproduced completely below, specifies the main parameters |
| 6 |
for the experiment. |
| 7 |
The parameters that are significant for this configuration are: |
| 8 |
|
| 9 |
\begin{itemize} |
| 10 |
|
| 11 |
\item Lines PUT_LINE_NB:tRef=, |
| 12 |
\begin{verbatim} |
| 13 |
tRef=295.2, 295.5, 295.9, 296.3, 296.7, 297.1, 297.6, 298.1, 298.7, 299.3, |
| 14 |
\end{verbatim} |
| 15 |
$\cdots$ \\ |
| 16 |
set reference values for potential temperature (in Kelvin units) |
| 17 |
at each model level. |
| 18 |
The entries are ordered like model level, from surface up to the top. |
| 19 |
Density is calculated from anomalies at each level evaluated |
| 20 |
with respect to the reference values set here. |
| 21 |
\\ \fbox{ |
| 22 |
\begin{minipage}{5.0in} |
| 23 |
{\it S/R INI\_THETA}({\it ini\_theta.F}) |
| 24 |
\end{minipage} |
| 25 |
} |
| 26 |
|
| 27 |
|
| 28 |
\item Line PUT_LINE_NB:no_slip_sides=, |
| 29 |
\begin{verbatim} |
| 30 |
no_slip_sides=.FALSE., |
| 31 |
\end{verbatim} |
| 32 |
this line selects a free-slip lateral boundary condition for |
| 33 |
the horizontal Laplacian friction operator |
| 34 |
e.g. $\frac{\partial u}{\partial y}$=0 along boundaries in $y$ and |
| 35 |
$\frac{\partial v}{\partial x}$=0 along boundaries in $x$. |
| 36 |
|
| 37 |
\item Lines PUT_LINE_NB:no_slip_bottom=, |
| 38 |
\begin{verbatim} |
| 39 |
no_slip_bottom=.FALSE., |
| 40 |
\end{verbatim} |
| 41 |
this line selects a free-slip boundary condition at the top, |
| 42 |
in the vertical Laplacian friction operator |
| 43 |
e.g. $\frac{\partial u}{\partial p} = \frac{\partial v}{\partial p} = 0$ |
| 44 |
|
| 45 |
\item Line PUT_LINE_NB:buoyancyRelation=, |
| 46 |
\begin{verbatim} |
| 47 |
buoyancyRelation='ATMOSPHERIC', |
| 48 |
\end{verbatim} |
| 49 |
this line sets the type of fluid and the type of vertical coordinate to use, |
| 50 |
which, in this case, is air with a pressure like coordinate ($p$ or $p^*$). |
| 51 |
|
| 52 |
\item Line PUT_LINE_NB:eosType=, |
| 53 |
\begin{verbatim} |
| 54 |
eosType='IDEALGAS', |
| 55 |
\end{verbatim} |
| 56 |
Selects the Ideal gas equation of state. |
| 57 |
%\\ \fbox{ |
| 58 |
%\begin{minipage}{5.0in} |
| 59 |
%{\it S/R FIND\_RHO}~({\it find\_rho.F})\\ |
| 60 |
%{\it S/R FIND\_ALPHA}~({\it find\_alpha.F}) |
| 61 |
%\end{minipage} |
| 62 |
%} |
| 63 |
|
| 64 |
\item Line PUT_LINE_NB:implicitFreeSurface=, |
| 65 |
\begin{verbatim} |
| 66 |
implicitFreeSurface=.TRUE., |
| 67 |
\end{verbatim} |
| 68 |
Selects the way the barotropic equation is solved, using here the implicit |
| 69 |
free-surface formulation. |
| 70 |
\\ \fbox{ |
| 71 |
\begin{minipage}{5.0in} |
| 72 |
{\it S/R SOLVE\_FOR\_PRESSURE}~({\it solve\_for\_pressure.F}) |
| 73 |
\end{minipage} |
| 74 |
} |
| 75 |
|
| 76 |
\item Line PUT_LINE_NB:exactConserv=, |
| 77 |
\begin{verbatim} |
| 78 |
exactConserv=.TRUE., |
| 79 |
\end{verbatim} |
| 80 |
Explicitly calculate again the surface pressure changes from |
| 81 |
the divergence of the vertically integrated horizontal flow, |
| 82 |
after the implicit free surface solver and filters are applied. |
| 83 |
\\ \fbox{ |
| 84 |
\begin{minipage}{5.0in} |
| 85 |
{\it S/R INTEGR\_CONTINUITY}~({\it integr\_continuity.F}) |
| 86 |
\end{minipage} |
| 87 |
} |
| 88 |
|
| 89 |
\item Line PUT_LINE_NB:nonlinFreeSurf= |
| 90 |
and Line PUT_LINE_NB:select_rStar=, |
| 91 |
\begin{verbatim} |
| 92 |
nonlinFreeSurf=4, |
| 93 |
select_rStar=2, |
| 94 |
\end{verbatim} |
| 95 |
Select the Non-Linear free surface formulation, using $r^*$ vertical coordinate |
| 96 |
(here $p^*$). |
| 97 |
Note that, except for the default ($= 0$), other values of those 2 parameters |
| 98 |
are only permitted for testing/debuging purpose. |
| 99 |
\\ \fbox{ |
| 100 |
\begin{minipage}{5.0in} |
| 101 |
{\it S/R CALC\_R\_STAR}~({\it calc\_r\_star.F})\\ |
| 102 |
{\it S/R UPDATE\_R\_STAR}~({\it update\_r\_star.F}) |
| 103 |
\end{minipage} |
| 104 |
} |
| 105 |
|
| 106 |
\item Line PUT_LINE_NB:uniformLin_PhiSurf= |
| 107 |
\begin{verbatim} |
| 108 |
uniformLin_PhiSurf=.FALSE., |
| 109 |
\end{verbatim} |
| 110 |
Select the linear relation between surface geopotential anomaly |
| 111 |
and surface pressure anomaly to be evaluated from |
| 112 |
$\frac{\partial \Phi_s}{\partial p_s} = 1/\rho(\theta_{Ref})$ |
| 113 |
(see section \ref{sect:phi-freesurface}). |
| 114 |
Note that using the default (=TRUE), the constant $1/\rho_0$ is |
| 115 |
used instead, and is not necessary consistent with other |
| 116 |
parts of the geopotential that relies on $\theta_{Ref}$. |
| 117 |
\\ \fbox{ |
| 118 |
\begin{minipage}{5.0in} |
| 119 |
{\it S/R INI\_LINEAR\_PHISURF}~({\it ini\_linear\_phisurf.F}) |
| 120 |
\end{minipage} |
| 121 |
} |
| 122 |
|
| 123 |
\item Line PUT_LINE_NB:saltStepping= and Line PUT_LINE_NB:momViscosity= |
| 124 |
\begin{verbatim} |
| 125 |
saltStepping=.FALSE., |
| 126 |
momViscosity=.FALSE., |
| 127 |
\end{verbatim} |
| 128 |
Do not step forward Water vapour and do not compute viscous terms. |
| 129 |
This allow to save some computer time. |
| 130 |
|
| 131 |
\item Line PUT_LINE_NB:vectorInvariantMomentum= |
| 132 |
\begin{verbatim} |
| 133 |
vectorInvariantMomentum=.TRUE., |
| 134 |
\end{verbatim} |
| 135 |
Select the vector-invariant form to solve the momentum equation. |
| 136 |
\\ \fbox{ |
| 137 |
\begin{minipage}{5.0in} |
| 138 |
{\it S/R MOM\_VECINV}~({\it mom\_vecinv.F}) |
| 139 |
\end{minipage} |
| 140 |
} |
| 141 |
|
| 142 |
\item Line PUT_LINE_NB:staggerTimeStep= |
| 143 |
\begin{verbatim} |
| 144 |
staggerTimeStep=.TRUE., |
| 145 |
\end{verbatim} |
| 146 |
Select the staggered time-stepping (rather than syncronous time stepping). |
| 147 |
|
| 148 |
\item Line PUT_LINE_NB:readBinaryPrec= and PUT_LINE_NB:writeBinaryPrec= |
| 149 |
\begin{verbatim} |
| 150 |
readBinaryPrec=64, |
| 151 |
writeBinaryPrec=64, |
| 152 |
\end{verbatim} |
| 153 |
Sets format for reading binary input datasets and writing output fields to |
| 154 |
use 64-bit representation for floating-point numbers. |
| 155 |
\\ \fbox{ |
| 156 |
\begin{minipage}{5.0in} |
| 157 |
{\it S/R READ\_WRITE\_FLD}~({\it read\_write\_fld.F})\\ |
| 158 |
{\it S/R READ\_WRITE\_REC}~({\it read\_write\_rec.F}) |
| 159 |
\end{minipage} |
| 160 |
} |
| 161 |
|
| 162 |
\item Line PUT_LINE_NB:cg2dMaxIters=, |
| 163 |
\begin{verbatim} |
| 164 |
cg2dMaxIters=200, |
| 165 |
\end{verbatim} |
| 166 |
Sets maximum number of iterations the two-dimensional, conjugate |
| 167 |
gradient solver will use, {\bf irrespective of convergence |
| 168 |
criteria being met}. |
| 169 |
\\ \fbox{ |
| 170 |
\begin{minipage}{5.0in} |
| 171 |
{\it S/R CG2D}~({\it cg2d.F}) |
| 172 |
\end{minipage} |
| 173 |
} |
| 174 |
|
| 175 |
\item Line PUT_LINE_NB:cg2dTargetResWunit=, |
| 176 |
\begin{verbatim} |
| 177 |
cg2dTargetResWunit=1.E-17, |
| 178 |
\end{verbatim} |
| 179 |
Sets the tolerance (in units of $\omega$) which the |
| 180 |
two-dimensional, conjugate gradient solver will use to test for convergence |
| 181 |
in equation \ref{EQ:eg-hs-congrad_2d_resid} to $1 \times 10^{-17} Pa/s$. |
| 182 |
Solver will iterate until |
| 183 |
tolerance falls below this value or until the maximum number of |
| 184 |
solver iterations is reached. |
| 185 |
\\ \fbox{ |
| 186 |
\begin{minipage}{5.0in} |
| 187 |
{\it S/R CG2D}~({\it cg2d.F}) |
| 188 |
\end{minipage} |
| 189 |
} |
| 190 |
|
| 191 |
\item Line PUT_LINE_NB:deltaT=, |
| 192 |
\begin{verbatim} |
| 193 |
deltaT=450., |
| 194 |
\end{verbatim} |
| 195 |
Sets the timestep $\Delta t$ used in the model to |
| 196 |
$450~{\rm s}$ ($= 1/8 {\rm h}$). |
| 197 |
\\ \fbox{ |
| 198 |
\begin{minipage}{5.0in} |
| 199 |
{\it S/R TIMESTEP}({\it timestep.F})\\ |
| 200 |
{\it S/R TIMESTEP\_TRACER}({\it timestep\_tracer.F}) |
| 201 |
\end{minipage} |
| 202 |
} |
| 203 |
|
| 204 |
\item Line PUT_LINE_NB:startTime=, |
| 205 |
\begin{verbatim} |
| 206 |
startTime=124416000., |
| 207 |
\end{verbatim} |
| 208 |
Sets the starting time, in seconds, for the model time counter. |
| 209 |
A non-zero starting time requires to read the initial state |
| 210 |
from a pickup file. By default the pickup file is named according |
| 211 |
to the integer number ({\it nIter0}) of time steps |
| 212 |
in the {\it startTime} value ($ nIter0 = startTime / deltaT $). |
| 213 |
|
| 214 |
\item Line PUT_LINE_NB:#nTimeSteps=, |
| 215 |
\begin{verbatim} |
| 216 |
#nTimeSteps=69120, |
| 217 |
\end{verbatim} |
| 218 |
A commented out setting for the length of the simulation |
| 219 |
(in number of time-step) that corresponds to 1 year simulation. |
| 220 |
|
| 221 |
\item Line PUT_LINE_NB:nTimeSteps= and PUT_LINE_NB:monitorFreq=, |
| 222 |
\begin{verbatim} |
| 223 |
nTimeSteps=16, |
| 224 |
monitorFreq=1., |
| 225 |
\end{verbatim} |
| 226 |
Sets the length of the simulation (in number of time-step) |
| 227 |
and the frequency (in seconds) for "monitor" output. |
| 228 |
to 16 iterations and 1 seconds respectively. This choice |
| 229 |
corresponds to a short simulation test. |
| 230 |
|
| 231 |
\item Line PUT_LINE_NB:pChkptFreq=, |
| 232 |
\begin{verbatim} |
| 233 |
pChkptFreq=31104000., |
| 234 |
\end{verbatim} |
| 235 |
Sets the time interval, in seconds, bewteen 2 consecutive |
| 236 |
"permanent" pickups ("permanent checkpoint frequency") |
| 237 |
that are used to restart the simuilation, to 1 year. |
| 238 |
|
| 239 |
\item Line PUT_LINE_NB:chkptFreq=, |
| 240 |
\begin{verbatim} |
| 241 |
chkptFreq=2592000., |
| 242 |
\end{verbatim} |
| 243 |
Sets the time interval, in seconds, bewteen 2 consecutive |
| 244 |
"temporary" pickups ("checkpoint frequency") to 1 month. |
| 245 |
The "temporary" pickup file name is alternatively "ckptA" |
| 246 |
and "ckptB" ; thoses pickup (as opposed to the permanent ones) |
| 247 |
are designed to be over-written by the model as the simulation |
| 248 |
progresses. |
| 249 |
|
| 250 |
\item Line PUT_LINE_NB:dumpFreq=, |
| 251 |
\begin{verbatim} |
| 252 |
dumpFreq=2592000., |
| 253 |
\end{verbatim} |
| 254 |
Set the frequencies (in seconds) for the snap-shot output |
| 255 |
to 1 month. |
| 256 |
|
| 257 |
\item Line PUT_LINE_NB:#monitorFreq=, |
| 258 |
\begin{verbatim} |
| 259 |
#monitorFreq=43200., |
| 260 |
\end{verbatim} |
| 261 |
A commented out line setting the frequency (in seconds) for the |
| 262 |
"monitor" output to 12.h. This frequency fits |
| 263 |
better the longer simulation of 1 year. |
| 264 |
|
| 265 |
\item Line PUT_LINE_NB:usingCurvilinearGrid=, |
| 266 |
\begin{verbatim} |
| 267 |
usingCurvilinearGrid=.TRUE., |
| 268 |
\end{verbatim} |
| 269 |
Set the horizontal type of grid to Curvilinear-Grid. |
| 270 |
|
| 271 |
\item Line PUT_LINE_NB:horizGridFile=, |
| 272 |
\begin{verbatim} |
| 273 |
horizGridFile='grid_cs32', |
| 274 |
\end{verbatim} |
| 275 |
Set the root for the grid file name to "{\it grid\_cs32}". |
| 276 |
The grid-file names are derived from the root, adding a |
| 277 |
suffix with the face number (e.g.: {\it .face001.bin}, |
| 278 |
{\it .face002.bin} $\cdots$ ) |
| 279 |
\\ \fbox{ |
| 280 |
\begin{minipage}{5.0in} |
| 281 |
{\it S/R INI\_CURVILINEAR\_GRID}~({\it ini\_curvilinear\_grid.F}) |
| 282 |
\end{minipage} |
| 283 |
} |
| 284 |
|
| 285 |
\item Lines PUT_LINE_NB:delR= and PUT_LINE_NB:Ro_SeaLevel=, |
| 286 |
\begin{verbatim} |
| 287 |
delR=20*50.E2, |
| 288 |
Ro_SeaLevel=1.E5, |
| 289 |
\end{verbatim} |
| 290 |
Those 2 lines define the vertical discretization, in pressure units. |
| 291 |
The $1^{rst}$ one sets the increments in pressure units (Pa), |
| 292 |
to 20 equally thick levels of $50 \times 10^2 {\rm Pa}$ each. |
| 293 |
The $2^{nd}$ one sets the reference pressure at the sea-level, |
| 294 |
to $10^5 {\rm Pa}$. This define the origin (interface $k=1$) |
| 295 |
of the vertical pressure axis, with decreasing pressure |
| 296 |
as the level index $k$ increases. |
| 297 |
\\ \fbox{ |
| 298 |
\begin{minipage}{5.0in} |
| 299 |
{\it S/R INI\_VERTICAL\_GRID}~({\it ini\_vertical\_grid.F}) |
| 300 |
\end{minipage} |
| 301 |
} |
| 302 |
|
| 303 |
\item Line PUT_LINE_NB:#topoFile=, |
| 304 |
\begin{verbatim} |
| 305 |
#topoFile='topo.cs.bin' |
| 306 |
\end{verbatim} |
| 307 |
This commented out line would allow to set the file name |
| 308 |
of a 2-D orography file, in meters units, to '{\it topo.cs.bin}'. |
| 309 |
\\ \fbox{ |
| 310 |
\begin{minipage}{5.0in} |
| 311 |
{\it S/R INI\_DEPTH}~({\it ini\_depth.F}) |
| 312 |
\end{minipage} |
| 313 |
} |
| 314 |
|
| 315 |
\end{itemize} |
| 316 |
|
| 317 |
\noindent other lines in the file {\it input/data} are standard values |
| 318 |
that are described in the MITgcm Getting Started and MITgcm Parameters |
| 319 |
notes. |
Parent Directory
| 
Revision Log
| 
Revision Graph