| 1 |
molod |
1.4 |
\subsection{EXF: The external forcing package |
| 2 |
heimbach |
1.1 |
\label{sec:pkg:exf}} |
| 3 |
|
|
\begin{rawhtml} |
| 4 |
|
|
<!-- CMIREDIR:sectionexf: --> |
| 5 |
|
|
\end{rawhtml} |
| 6 |
|
|
|
| 7 |
|
|
|
| 8 |
molod |
1.4 |
\subsubsection{Introduction |
| 9 |
heimbach |
1.1 |
\label{sec:pkg:exf:intro}} |
| 10 |
|
|
|
| 11 |
|
|
The external forcing package, in conjunction with the |
| 12 |
|
|
calendar package (cal), enables the handling of real-time |
| 13 |
|
|
(or ``model-time'') forcing |
| 14 |
|
|
fields of differing temporal forcing patterns. |
| 15 |
|
|
It comprises climatological restoring and relaxation. |
| 16 |
|
|
Bulk formulae are implemented to convert atmospheric fields |
| 17 |
|
|
to surface fluxes. |
| 18 |
|
|
An interpolation routine provides on-the-fly interpolation of |
| 19 |
|
|
forcing fields an arbitrary grid onto the model grid. |
| 20 |
|
|
|
| 21 |
|
|
CPP options enable or disable different aspects of the package |
| 22 |
|
|
(Section \ref{sec:pkg:exf:config}). |
| 23 |
|
|
Runtime options, flags, filenames and field-related dates/times are |
| 24 |
|
|
set in \texttt{data.exf} and \texttt{data.exf\_clim} |
| 25 |
|
|
(Section \ref{sec:pkg:exf:runtime}). |
| 26 |
|
|
A description of key subroutines is given in Section |
| 27 |
|
|
\ref{sec:pkg:exf:subroutines}. |
| 28 |
|
|
Input fields, units and sign conventions are summarized in |
| 29 |
|
|
Section \ref{sec:pkg:exf:fields_units}, and available diagnostics |
| 30 |
|
|
output is listed in Section \ref{sec:pkg:exf:fields_diagnostics}. |
| 31 |
|
|
|
| 32 |
|
|
%---------------------------------------------------------------------- |
| 33 |
|
|
|
| 34 |
molod |
1.4 |
\subsubsection{EXF configuration, compiling \& running} |
| 35 |
heimbach |
1.2 |
|
| 36 |
molod |
1.4 |
\paragraph{Compile-time options |
| 37 |
heimbach |
1.1 |
\label{sec:pkg:exf:config}} |
| 38 |
|
|
|
| 39 |
|
|
As with all MITgcm packages, EXF can be turned on or off at compile time |
| 40 |
|
|
using the \texttt{packages.conf} file or the \texttt{genmake2} |
| 41 |
|
|
\texttt{-enable=exf} or \texttt{-disable=exf} switches. |
| 42 |
|
|
|
| 43 |
|
|
Parts of the exf code can be enabled or disabled at compile time |
| 44 |
|
|
via CPP preprocessor flags. These options are set in either |
| 45 |
|
|
\texttt{EXF\_OPTIONS.h} or in \texttt{ECCO\_CPPOPTIONS.h}. |
| 46 |
|
|
Table \ref{tab:pkg:exf:cpp} summarizes these options. |
| 47 |
|
|
|
| 48 |
|
|
\begin{table}[b!] |
| 49 |
|
|
\label{tab:pkg:exf:cpp} |
| 50 |
|
|
{\footnotesize |
| 51 |
|
|
\begin{tabular}{|l|l|} |
| 52 |
heimbach |
1.2 |
\hline |
| 53 |
heimbach |
1.1 |
\textbf{CPP option} & \textbf{Description} \\ |
| 54 |
heimbach |
1.2 |
\hline \hline |
| 55 |
heimbach |
1.1 |
\texttt{EXF\_VERBOSE} & |
| 56 |
|
|
verbose mode (recommended only for testing) \\ |
| 57 |
|
|
\texttt{ALLOW\_ATM\_TEMP} & |
| 58 |
|
|
compute heat/freshwater fluxes from atmos. state input \\ |
| 59 |
|
|
\texttt{ALLOW\_ATM\_WIND} & |
| 60 |
|
|
compute wind stress from wind speed input\\ |
| 61 |
|
|
\texttt{ALLOW\_BULKFORMULAE} & |
| 62 |
heimbach |
1.3 |
is used if \texttt{ALLOW\_ATM\_TEMP} or |
| 63 |
|
|
\texttt{ALLOW\_ATM\_WIND} is enabled \\ |
| 64 |
heimbach |
1.1 |
\texttt{EXF\_READ\_EVAP} & read evaporation instead of computing it \\ |
| 65 |
|
|
\texttt{ALLOW\_RUNOFF} & read time-constant river/glacier run-off field \\ |
| 66 |
|
|
\texttt{ALLOW\_DOWNWARD\_RADIATION} & compute net from downward or downward from net radiation \\ |
| 67 |
|
|
\texttt{USE\_EXF\_INTERPOLATION} & enable on-the-fly bilinear or bicubic interpolation of input fields \\ |
| 68 |
|
|
\hline |
| 69 |
heimbach |
1.3 |
\multicolumn{2}{|c|}{\textit{used in conjunction with relaxation to prescribed (climatological) fields}} \\ |
| 70 |
|
|
\hline |
| 71 |
heimbach |
1.1 |
\texttt{ALLOW\_CLIMTEMP\_RELAXATION} & |
| 72 |
heimbach |
1.3 |
relaxation to 3-D temperature climatology \\ |
| 73 |
heimbach |
1.1 |
\texttt{ALLOW\_CLIMSALT\_RELAXATION} & |
| 74 |
heimbach |
1.2 |
relaxation to 3-D salinity climatology \\ |
| 75 |
heimbach |
1.1 |
\texttt{ALLOW\_CLIMSST\_RELAXATION} & |
| 76 |
heimbach |
1.2 |
relaxation to 2-D SST climatology \\ |
| 77 |
heimbach |
1.1 |
\texttt{ALLOW\_CLIMSSS\_RELAXATION} & |
| 78 |
heimbach |
1.2 |
relaxation to 2-D SSS climatology \\ |
| 79 |
heimbach |
1.1 |
\hline |
| 80 |
heimbach |
1.3 |
\multicolumn{2}{|c|}{\textit{these are set outside of EXF in} \texttt{CPP\_OPTIONS.h}} \\ |
| 81 |
|
|
\hline |
| 82 |
|
|
\texttt{SHORTWAVE\_HEATING} & enable shortwave radiation \\ |
| 83 |
|
|
\texttt{ATMOSPHERIC\_LOADING} & enable surface pressure forcing \\ |
| 84 |
heimbach |
1.1 |
\hline |
| 85 |
|
|
\end{tabular} |
| 86 |
|
|
} |
| 87 |
|
|
\caption{~} |
| 88 |
|
|
\end{table} |
| 89 |
|
|
|
| 90 |
|
|
|
| 91 |
|
|
%---------------------------------------------------------------------- |
| 92 |
|
|
|
| 93 |
heimbach |
1.2 |
\subsubsection{Run-time parameters |
| 94 |
heimbach |
1.1 |
\label{sec:pkg:exf:runtime}} |
| 95 |
|
|
|
| 96 |
heimbach |
1.2 |
Run-time parameters are set in files \texttt{data.pkg}, |
| 97 |
heimbach |
1.3 |
and \texttt{data.pkg\_clim} (for relaxation/climatological fields) |
| 98 |
|
|
which are read in \texttt{exf\_readparms.F}. |
| 99 |
heimbach |
1.2 |
Run-time parameters may be broken into 2 categories: |
| 100 |
|
|
(i) general flags and parameters, and |
| 101 |
|
|
(ii) attributes for each forcing and climatological field. |
| 102 |
|
|
|
| 103 |
|
|
\paragraph{General flags and parameters} |
| 104 |
|
|
|
| 105 |
heimbach |
1.3 |
~ |
| 106 |
|
|
|
| 107 |
heimbach |
1.2 |
\begin{table}[h!] |
| 108 |
|
|
\label{tab:pkg:exf:runtime_flags} |
| 109 |
|
|
{\footnotesize |
| 110 |
heimbach |
1.3 |
\begin{tabular}{|l|c|l|} |
| 111 |
heimbach |
1.2 |
\hline |
| 112 |
|
|
\textbf{Flag/parameter} & \textbf{default} & \textbf{Description} \\ |
| 113 |
|
|
\hline \hline |
| 114 |
heimbach |
1.3 |
useExfCheckRange & \texttt{.TRUE.} & |
| 115 |
|
|
check range of input fields and stop if out of range \\ |
| 116 |
|
|
useExfYearlyFields & \texttt{.FALSE.} & |
| 117 |
|
|
append current year postfix of form \texttt{\_YYYY} on filename \\ |
| 118 |
|
|
twoDigitYear & \texttt{.FALSE.} & |
| 119 |
|
|
instead of appending \texttt{\_YYYY} append \texttt{YY} \\ |
| 120 |
|
|
repeatPeriod & \texttt{0.0} & $ > 0 $ : |
| 121 |
|
|
cycle through all input fields at the same period (in seconds) \\ |
| 122 |
|
|
~ & ~ & $ = 0 $ : |
| 123 |
|
|
use period assigned to each field \\ |
| 124 |
|
|
exf\_offset\_atemp & \texttt{0.0} & set to 273.16 to convert from deg. Kelvin (assumed input) to Celsius \\ |
| 125 |
|
|
windstressmax & \texttt{2.0} & |
| 126 |
|
|
max. allowed wind stress $N/m^2$ \\ |
| 127 |
|
|
exf\_albedo & \texttt{0.1} & |
| 128 |
|
|
surface albedo used to compute downward vs. net radiative fluxes \\ |
| 129 |
|
|
exf\_iprec & \texttt{32} & |
| 130 |
|
|
precision of input fields (32-bit or 64-bit) \\ |
| 131 |
|
|
exf\_yftype & \texttt{'RL'} & |
| 132 |
|
|
precision of arrays ('RL' vs. 'RS') \\ |
| 133 |
heimbach |
1.2 |
\hline |
| 134 |
|
|
\end{tabular} |
| 135 |
|
|
} |
| 136 |
|
|
\caption{~} |
| 137 |
|
|
\end{table} |
| 138 |
|
|
|
| 139 |
|
|
|
| 140 |
heimbach |
1.3 |
\paragraph{Field attributes} ~ \\ |
| 141 |
|
|
% |
| 142 |
|
|
All EXF fields are listed in Section \ref{sec:pkg:exf:fields_units}. |
| 143 |
|
|
Each field has a number of attributes which can be customized. |
| 144 |
|
|
They are summarized in |
| 145 |
|
|
Table \ref{tab:pkg:exf:runtime_attributes}. |
| 146 |
|
|
To obtain an attribute for a specific field, e.g. \texttt{uwind} |
| 147 |
|
|
prepend the field name to the listed attribute, e.g. for attribute |
| 148 |
|
|
\texttt{period} this yields \texttt{uwindperiod}: |
| 149 |
|
|
% |
| 150 |
|
|
\begin{eqnarray*} |
| 151 |
|
|
\begin{array}{cccccc} |
| 152 |
|
|
~ & \texttt{field} & \& & \texttt{attribute} & \longrightarrow & \texttt{parameter} \\ |
| 153 |
|
|
\text{e.g.} & \text{uwind} & \& & \text{period} & \longrightarrow & \text{uwindperiod} \\ |
| 154 |
|
|
\end{array} |
| 155 |
|
|
\end{eqnarray*} |
| 156 |
|
|
% |
| 157 |
heimbach |
1.2 |
|
| 158 |
heimbach |
1.3 |
\begin{table}[h!] |
| 159 |
|
|
\label{tab:pkg:exf:runtime_attributes} |
| 160 |
|
|
{\footnotesize |
| 161 |
|
|
\begin{tabular}{|l|c|l|} |
| 162 |
|
|
\hline |
| 163 |
|
|
\textbf{attribute} & \textbf{Default} & \textbf{Description} \\ |
| 164 |
|
|
\hline \hline |
| 165 |
|
|
\textit{field}\texttt{file} & ' ' & |
| 166 |
|
|
filename; if left empty no file will be read; \texttt{const} will be used instead \\ |
| 167 |
|
|
\textit{field}\texttt{const} & 0. & |
| 168 |
|
|
constant that will be used if no file is read \\ |
| 169 |
|
|
\textit{field}\texttt{startdate1} & 0. & |
| 170 |
|
|
format: \texttt{YYYYMMDD}; start year (YYYY), month (MM), day (YY) \\ |
| 171 |
|
|
~&~& of field to determine record number \\ |
| 172 |
|
|
\textit{field}\texttt{startdate2} & 0. & |
| 173 |
|
|
format: \texttt{HHMMSS}; start hour (HH), minute (MM), second(SS) \\ |
| 174 |
|
|
~&~& of field to determine record number\\ |
| 175 |
|
|
\textit{field}\texttt{period} & 0. & |
| 176 |
|
|
interval in seconds between two records \\ |
| 177 |
|
|
\texttt{exf\_inscal\_}\textit{field}& ~ & |
| 178 |
|
|
optional rescaling of input fields to comply with EXF units \\ |
| 179 |
|
|
\texttt{exf\_outscal\_}\textit{field}& ~ & |
| 180 |
|
|
optional rescaling of EXF fields when mapped onto MITgcm fields \\ |
| 181 |
|
|
\hline |
| 182 |
|
|
\multicolumn{3}{|c|}{\textit{used in conjunction with} |
| 183 |
|
|
\texttt{EXF\_USE\_INTERPOLATION}} \\ |
| 184 |
|
|
\hline |
| 185 |
|
|
\textit{field}\texttt{\_lon0} & $thetaMin+delX/2$ & |
| 186 |
|
|
starting longitude of input \\ |
| 187 |
|
|
\textit{field}\texttt{\_lon\_inc} & $delX$ & |
| 188 |
|
|
increment in longitude of input \\ |
| 189 |
|
|
\textit{field}\texttt{\_lat0} & $phiMin+delY/2$ & |
| 190 |
|
|
starting latitude of input \\ |
| 191 |
|
|
\textit{field}\texttt{\_lat\_inc} & $delY$ & |
| 192 |
|
|
increment in latitude of input \\ |
| 193 |
|
|
\textit{field}\texttt{\_nlon} & $Nx$ & |
| 194 |
|
|
number of grid points in longitude of input \\ |
| 195 |
|
|
\textit{field}\texttt{\_nlat} & $Ny$ & |
| 196 |
|
|
number of grid points in longitude of input \\ |
| 197 |
|
|
\hline |
| 198 |
|
|
\end{tabular} |
| 199 |
|
|
} |
| 200 |
|
|
\caption{\newline |
| 201 |
|
|
Note one exception for the default of |
| 202 |
|
|
\texttt{atempconst} = celsius2K = 273.16} |
| 203 |
|
|
\end{table} |
| 204 |
heimbach |
1.2 |
|
| 205 |
heimbach |
1.3 |
\paragraph{Example configuration} ~ \\ |
| 206 |
|
|
% |
| 207 |
|
|
The following block is taken from the \texttt{data.exf} file |
| 208 |
|
|
of the veification experiment \texttt{global\_with\_exf/}. |
| 209 |
|
|
It defines attributes for the heat flux variable \texttt{hflux}: |
| 210 |
|
|
|
| 211 |
|
|
\begin{verbatim} |
| 212 |
|
|
hfluxfile = 'ncep_qnet.bin', |
| 213 |
|
|
hfluxstartdate1 = 19920101, |
| 214 |
|
|
hfluxstartdate2 = 000000, |
| 215 |
|
|
hfluxperiod = 2592000.0, |
| 216 |
|
|
hflux_lon0 = 2 |
| 217 |
|
|
hflux_lon_inc = 4 |
| 218 |
|
|
hflux_lat0 = -78 |
| 219 |
|
|
hflux_lat_inc = 39*4 |
| 220 |
|
|
hflux_nlon = 90 |
| 221 |
|
|
hflux_nlat = 40 |
| 222 |
|
|
\end{verbatim} |
| 223 |
|
|
|
| 224 |
|
|
EXF will read a file of name 'ncep\_qnet.bin'. |
| 225 |
|
|
Its first record represents January 1st, 1991 at 00:00 UTC. |
| 226 |
|
|
Next record is 2592000 seconds (or 30 days) later. |
| 227 |
|
|
Interpolation on-the-fly is used (in the present case trivially |
| 228 |
|
|
on the same grid, but included nevertheless for illustration), |
| 229 |
|
|
and input field grid starting coordinates and increments are |
| 230 |
|
|
supplied as well. |
| 231 |
heimbach |
1.2 |
|
| 232 |
heimbach |
1.1 |
%---------------------------------------------------------------------- |
| 233 |
|
|
|
| 234 |
molod |
1.4 |
\subsubsection{EXF input fields and units |
| 235 |
heimbach |
1.1 |
\label{sec:pkg:exf:fields_units}} |
| 236 |
|
|
|
| 237 |
|
|
The following list is taken from the header file \texttt{exf\_fields.h}. |
| 238 |
heimbach |
1.3 |
It comprises all EXF input fields. |
| 239 |
|
|
|
| 240 |
|
|
Output fields which EXF provides to the MITgcm are fields |
| 241 |
|
|
\textbf{fu}, \textbf{fv}, \textbf{Qnet}, \textbf{Qsw}, \textbf{EmPmR}, |
| 242 |
|
|
and \textbf{pload}. They are defined in \texttt{FFIELDS.h}. |
| 243 |
heimbach |
1.1 |
|
| 244 |
heimbach |
1.3 |
{\scriptsize |
| 245 |
heimbach |
1.1 |
\begin{verbatim} |
| 246 |
|
|
|
| 247 |
heimbach |
1.3 |
c---------------------------------------------------------------------- |
| 248 |
|
|
c | |
| 249 |
|
|
c field :: Description |
| 250 |
|
|
c | |
| 251 |
|
|
c---------------------------------------------------------------------- |
| 252 |
heimbach |
1.1 |
c ustress :: Zonal surface wind stress in N/m^2 |
| 253 |
heimbach |
1.3 |
c | > 0 for increase in uVel, which is west to |
| 254 |
|
|
c | east for cartesian and spherical polar grids |
| 255 |
|
|
c | Typical range: -0.5 < ustress < 0.5 |
| 256 |
|
|
c | Southwest C-grid U point |
| 257 |
|
|
c | Input field |
| 258 |
|
|
c---------------------------------------------------------------------- |
| 259 |
heimbach |
1.1 |
c vstress :: Meridional surface wind stress in N/m^2 |
| 260 |
heimbach |
1.3 |
c | > 0 for increase in vVel, which is south to |
| 261 |
|
|
c | north for cartesian and spherical polar grids |
| 262 |
|
|
c | Typical range: -0.5 < vstress < 0.5 |
| 263 |
|
|
c | Southwest C-grid V point |
| 264 |
|
|
c | Input field |
| 265 |
|
|
c---------------------------------------------------------------------- |
| 266 |
heimbach |
1.1 |
c hflux :: Net upward surface heat flux in W/m^2 |
| 267 |
heimbach |
1.3 |
c | excluding shortwave (on input) |
| 268 |
|
|
c | hflux = latent + sensible + lwflux |
| 269 |
|
|
c | > 0 for decrease in theta (ocean cooling) |
| 270 |
|
|
c | Typical range: -250 < hflux < 600 |
| 271 |
|
|
c | Southwest C-grid tracer point |
| 272 |
|
|
c | Input field |
| 273 |
|
|
c---------------------------------------------------------------------- |
| 274 |
heimbach |
1.1 |
c sflux :: Net upward freshwater flux in m/s |
| 275 |
heimbach |
1.3 |
c | sflux = evap - precip - runoff |
| 276 |
|
|
c | > 0 for increase in salt (ocean salinity) |
| 277 |
|
|
c | Typical range: -1e-7 < sflux < 1e-7 |
| 278 |
|
|
c | Southwest C-grid tracer point |
| 279 |
|
|
c | Input field |
| 280 |
|
|
c---------------------------------------------------------------------- |
| 281 |
heimbach |
1.1 |
c swflux :: Net upward shortwave radiation in W/m^2 |
| 282 |
heimbach |
1.3 |
c | swflux = - ( swdown - ice and snow absorption - reflected ) |
| 283 |
|
|
c | > 0 for decrease in theta (ocean cooling) |
| 284 |
|
|
c | Typical range: -350 < swflux < 0 |
| 285 |
|
|
c | Southwest C-grid tracer point |
| 286 |
|
|
c | Input field |
| 287 |
|
|
c---------------------------------------------------------------------- |
| 288 |
heimbach |
1.1 |
c uwind :: Surface (10-m) zonal wind velocity in m/s |
| 289 |
heimbach |
1.3 |
c | > 0 for increase in uVel, which is west to |
| 290 |
|
|
c | east for cartesian and spherical polar grids |
| 291 |
|
|
c | Typical range: -10 < uwind < 10 |
| 292 |
|
|
c | Southwest C-grid U point |
| 293 |
|
|
c | Input or input/output field |
| 294 |
|
|
c---------------------------------------------------------------------- |
| 295 |
heimbach |
1.1 |
c vwind :: Surface (10-m) meridional wind velocity in m/s |
| 296 |
heimbach |
1.3 |
c | > 0 for increase in vVel, which is south to |
| 297 |
|
|
c | north for cartesian and spherical polar grids |
| 298 |
|
|
c | Typical range: -10 < vwind < 10 |
| 299 |
|
|
c | Southwest C-grid V point |
| 300 |
|
|
c | Input or input/output field |
| 301 |
|
|
c---------------------------------------------------------------------- |
| 302 |
heimbach |
1.1 |
c atemp :: Surface (2-m) air temperature in deg K |
| 303 |
heimbach |
1.3 |
c | Typical range: 200 < atemp < 300 |
| 304 |
|
|
c | Southwest C-grid tracer point |
| 305 |
|
|
c | Input or input/output field |
| 306 |
|
|
c---------------------------------------------------------------------- |
| 307 |
heimbach |
1.1 |
c aqh :: Surface (2m) specific humidity in kg/kg |
| 308 |
heimbach |
1.3 |
c | Typical range: 0 < aqh < 0.02 |
| 309 |
|
|
c | Southwest C-grid tracer point |
| 310 |
|
|
c | Input or input/output field |
| 311 |
|
|
c---------------------------------------------------------------------- |
| 312 |
heimbach |
1.1 |
c lwflux :: Net upward longwave radiation in W/m^2 |
| 313 |
heimbach |
1.3 |
c | lwflux = - ( lwdown - ice and snow absorption - emitted ) |
| 314 |
|
|
c | > 0 for decrease in theta (ocean cooling) |
| 315 |
|
|
c | Typical range: -20 < lwflux < 170 |
| 316 |
|
|
c | Southwest C-grid tracer point |
| 317 |
|
|
c | Input field |
| 318 |
|
|
c---------------------------------------------------------------------- |
| 319 |
heimbach |
1.1 |
c evap :: Evaporation in m/s |
| 320 |
heimbach |
1.3 |
c | > 0 for increase in salt (ocean salinity) |
| 321 |
|
|
c | Typical range: 0 < evap < 2.5e-7 |
| 322 |
|
|
c | Southwest C-grid tracer point |
| 323 |
|
|
c | Input, input/output, or output field |
| 324 |
|
|
c---------------------------------------------------------------------- |
| 325 |
heimbach |
1.1 |
c precip :: Precipitation in m/s |
| 326 |
heimbach |
1.3 |
c | > 0 for decrease in salt (ocean salinity) |
| 327 |
|
|
c | Typical range: 0 < precip < 5e-7 |
| 328 |
|
|
c | Southwest C-grid tracer point |
| 329 |
|
|
c | Input or input/output field |
| 330 |
|
|
c---------------------------------------------------------------------- |
| 331 |
heimbach |
1.1 |
c runoff :: River and glacier runoff in m/s |
| 332 |
heimbach |
1.3 |
c | > 0 for decrease in salt (ocean salinity) |
| 333 |
|
|
c | Typical range: 0 < runoff < ???? |
| 334 |
|
|
c | Southwest C-grid tracer point |
| 335 |
|
|
c | Input or input/output field |
| 336 |
|
|
c | !!! WATCH OUT: Default exf_inscal_runoff !!! |
| 337 |
|
|
c | !!! in exf_readparms.F is not 1.0 !!! |
| 338 |
|
|
c---------------------------------------------------------------------- |
| 339 |
heimbach |
1.1 |
c swdown :: Downward shortwave radiation in W/m^2 |
| 340 |
heimbach |
1.3 |
c | > 0 for increase in theta (ocean warming) |
| 341 |
|
|
c | Typical range: 0 < swdown < 450 |
| 342 |
|
|
c | Southwest C-grid tracer point |
| 343 |
|
|
c | Input/output field |
| 344 |
|
|
c---------------------------------------------------------------------- |
| 345 |
heimbach |
1.1 |
c lwdown :: Downward longwave radiation in W/m^2 |
| 346 |
heimbach |
1.3 |
c | > 0 for increase in theta (ocean warming) |
| 347 |
|
|
c | Typical range: 50 < lwdown < 450 |
| 348 |
|
|
c | Southwest C-grid tracer point |
| 349 |
|
|
c | Input/output field |
| 350 |
|
|
c---------------------------------------------------------------------- |
| 351 |
heimbach |
1.1 |
c apressure :: Atmospheric pressure field in N/m^2 |
| 352 |
heimbach |
1.3 |
c | > 0 for ???? |
| 353 |
|
|
c | Typical range: ???? < apressure < ???? |
| 354 |
|
|
c | Southwest C-grid tracer point |
| 355 |
|
|
c | Input field |
| 356 |
|
|
c---------------------------------------------------------------------- |
| 357 |
|
|
|
| 358 |
heimbach |
1.1 |
\end{verbatim} |
| 359 |
|
|
} |
| 360 |
|
|
|
| 361 |
|
|
%---------------------------------------------------------------------- |
| 362 |
|
|
|
| 363 |
molod |
1.4 |
\subsubsection{Key subroutines |
| 364 |
heimbach |
1.1 |
\label{sec:pkg:exf:subroutines}} |
| 365 |
|
|
|
| 366 |
molod |
1.4 |
Top-level routine: \texttt{exf\_getforcing.F} |
| 367 |
heimbach |
1.3 |
|
| 368 |
|
|
{\scriptsize |
| 369 |
|
|
\begin{verbatim} |
| 370 |
|
|
|
| 371 |
|
|
C !CALLING SEQUENCE: |
| 372 |
|
|
c ... |
| 373 |
|
|
c exf_getforcing (TOP LEVEL ROUTINE) |
| 374 |
|
|
c | |
| 375 |
|
|
c |-- exf_getclim (get climatological fields used e.g. for relax.) |
| 376 |
|
|
c | |--- exf_set_climtemp (relax. to 3-D temperature field) |
| 377 |
|
|
c | |--- exf_set_climsalt (relax. to 3-D salinity field) |
| 378 |
|
|
c | |--- exf_set_climsst (relax. to 2-D SST field) |
| 379 |
|
|
c | |--- exf_set_climsss (relax. to 2-D SSS field) |
| 380 |
|
|
c | o |
| 381 |
|
|
c | |
| 382 |
|
|
c |-- exf_getffields <- this one does almost everything |
| 383 |
|
|
c | | 1. reads in fields, either flux or atmos. state, |
| 384 |
|
|
c | | depending on CPP options (for each variable two fields |
| 385 |
|
|
c | | consecutive in time are read in and interpolated onto |
| 386 |
|
|
c | | current time step). |
| 387 |
|
|
c | | 2. If forcing is atmos. state and control is atmos. state, |
| 388 |
|
|
c | | then the control variable anomalies are read here |
| 389 |
|
|
c | | * ctrl_getatemp |
| 390 |
|
|
c | | * ctrl_getaqh |
| 391 |
|
|
c | | * ctrl_getuwind |
| 392 |
|
|
c | | * ctrl_getvwind |
| 393 |
|
|
c | | If forcing and control are fluxes, then |
| 394 |
|
|
c | | controls are added later. |
| 395 |
|
|
c | o |
| 396 |
|
|
c | |
| 397 |
|
|
c |-- exf_check_range |
| 398 |
|
|
c | | 1. Check whether read fields are within assumed range |
| 399 |
|
|
c | | (may capture mismatches in units) |
| 400 |
|
|
c | o |
| 401 |
|
|
c | |
| 402 |
|
|
c |-- exf_bulkformulae |
| 403 |
|
|
c | | 1. Compute net or downwelling radiative fluxes via |
| 404 |
|
|
c | | Stefan-Boltzmann law in case only one is known. |
| 405 |
|
|
c | | 2. Compute air-sea momentum and buoyancy fluxes from |
| 406 |
|
|
c | | atmospheric state following Large and Pond, JPO, 1981/82 |
| 407 |
|
|
c | o |
| 408 |
|
|
c | |
| 409 |
|
|
c |-- < add time-mean river runoff here, if available > |
| 410 |
|
|
c | |
| 411 |
|
|
c |-- < update tile edges here > |
| 412 |
|
|
c | |
| 413 |
|
|
c |-- exf_getsurfacefluxes |
| 414 |
|
|
c | | 1. If forcing and control are fluxes, then |
| 415 |
|
|
c | | controls are added here. |
| 416 |
|
|
c | o |
| 417 |
|
|
c | |
| 418 |
|
|
c |-- < treatment of hflux w.r.t. swflux > |
| 419 |
|
|
c | |
| 420 |
|
|
c |-- exf_diagnostics_fill |
| 421 |
|
|
c | | 1. Do EXF-related diagnostics output here. |
| 422 |
|
|
c | o |
| 423 |
|
|
c | |
| 424 |
|
|
c |-- exf_mapfields |
| 425 |
|
|
c | | 1. Map the EXF variables onto the core MITgcm |
| 426 |
|
|
c | | forcing fields. |
| 427 |
|
|
c | o |
| 428 |
|
|
c | |
| 429 |
|
|
c |-- exf_bulkformulae |
| 430 |
|
|
c | If ALLOW_BULKFORMULAE, compute fluxes via bulkformulae |
| 431 |
|
|
c | |
| 432 |
|
|
c |-- exf_getsurfacefluxes |
| 433 |
|
|
c | If forcing and control is flux, then the |
| 434 |
|
|
c | control vector anomalies are read here |
| 435 |
|
|
c | * ctrl_getheatflux |
| 436 |
|
|
c | * ctrl_getsaltflux |
| 437 |
|
|
c | * ctrl_getzonstress |
| 438 |
|
|
c | * call ctrl_getmerstress |
| 439 |
|
|
c | |
| 440 |
|
|
c |-- exf_mapfields |
| 441 |
|
|
c | Forcing fields from exf package are mapped onto |
| 442 |
|
|
c | mitgcm forcing arrays. |
| 443 |
|
|
c | Mapping enables a runtime rescaling of fields |
| 444 |
|
|
|
| 445 |
|
|
\end{verbatim} |
| 446 |
|
|
} |
| 447 |
|
|
|
| 448 |
molod |
1.4 |
Bulk formula routine: \texttt{exf\_bulkformulae.F} |
| 449 |
heimbach |
1.3 |
|
| 450 |
molod |
1.4 |
Generic I/O routine: \texttt{exf\_set\_gen.F} |
| 451 |
heimbach |
1.3 |
|
| 452 |
molod |
1.4 |
Interpolation routine: \texttt{exf\_interp.F} |
| 453 |
heimbach |
1.3 |
|
| 454 |
molod |
1.4 |
Header routines |
| 455 |
heimbach |
1.3 |
|
| 456 |
heimbach |
1.1 |
%---------------------------------------------------------------------- |
| 457 |
|
|
|
| 458 |
molod |
1.4 |
\subsubsection{EXF diagnostics |
| 459 |
heimbach |
1.1 |
\label{sec:pkg:exf:diagnostics}} |
| 460 |
|
|
|
| 461 |
|
|
Diagnostics output is available via the diagnostics package |
| 462 |
|
|
(see Section \ref{sec:pkg:diagnostics}). |
| 463 |
|
|
Available output fields are summarized in |
| 464 |
|
|
Table \ref{tab:pkg:exf:diagnostics}. |
| 465 |
|
|
|
| 466 |
heimbach |
1.3 |
\begin{table}[h!] |
| 467 |
heimbach |
1.1 |
\label{tab:pkg:exf:diagnostics} |
| 468 |
|
|
{\footnotesize |
| 469 |
|
|
\begin{verbatim} |
| 470 |
|
|
------------------------------------------------------ |
| 471 |
|
|
<-Name->|Levs|grid|<-- Units -->|<- Tile (max=80c) |
| 472 |
|
|
------------------------------------------------------ |
| 473 |
heimbach |
1.3 |
EXFlwdn | 1 | SM | W/m^2 | Downward longwave radiation, >0 increases theta |
| 474 |
|
|
EXFswdn | 1 | SM | W/m^2 | Downward shortwave radiation, >0 increases theta |
| 475 |
|
|
EXFqnet | 1 | SM | W/m^2 | Net upward heat flux (turb+rad), >0 decreases theta |
| 476 |
|
|
EXFtaux | 1 | SU | N/m^2 | zonal surface wind stress, >0 increases uVel |
| 477 |
|
|
EXFtauy | 1 | SV | N/m^2 | meridional surface wind stress, >0 increases vVel |
| 478 |
|
|
EXFuwind| 1 | SM | m/s | zonal 10-m wind speed, >0 increases uVel |
| 479 |
|
|
EXFvwind| 1 | SM | m/s | meridional 10-m wind speed, >0 increases uVel |
| 480 |
|
|
EXFatemp| 1 | SM | degK | surface (2-m) air temperature |
| 481 |
|
|
EXFaqh | 1 | SM | kg/kg | surface (2-m) specific humidity |
| 482 |
|
|
EXFevap | 1 | SM | m/s | evaporation, > 0 increases salinity |
| 483 |
|
|
EXFpreci| 1 | SM | m/s | evaporation, > 0 decreases salinity |
| 484 |
|
|
EXFempmr| 1 | SM | m/s | net upward freshwater flux, > 0 increases salinity |
| 485 |
|
|
EXFpress| 1 | SM | N/m^2 | atmospheric pressure field |
| 486 |
heimbach |
1.1 |
\end{verbatim} |
| 487 |
|
|
} |
| 488 |
heimbach |
1.3 |
\caption{~} |
| 489 |
heimbach |
1.1 |
\end{table} |
| 490 |
|
|
|
| 491 |
|
|
%---------------------------------------------------------------------- |
| 492 |
|
|
|
| 493 |
molod |
1.4 |
\subsubsection{Reference experiments} |
| 494 |
heimbach |
1.1 |
|
| 495 |
molod |
1.4 |
global\_with\_exf: |
| 496 |
heimbach |
1.3 |
|
| 497 |
molod |
1.4 |
lab\_sea: |
| 498 |
heimbach |
1.3 |
|
| 499 |
heimbach |
1.1 |
%---------------------------------------------------------------------- |
| 500 |
|
|
|
| 501 |
molod |
1.4 |
\subsubsection{References} |
Parent Directory
| 
Revision Log
| 
Revision Graph