171 | | Geographical longitude (in degrees). |
172 | | |
173 | | Note that the radiation scheme also requires information on the geographical latitude (see [wiki:doc/app/inipar#phi phi]). |
174 | | }}} |
175 | | |---------------- |
176 | | {{{#!td style="vertical-align:top" |
177 | | [=#lw_radiation '''lw_radiation'''] |
| 186 | Net radiation at the surface in W/m². This parameter is only used in case of [#radiation_scheme radiation scheme]{{{= 'constant'}}}. |
| 187 | }}} |
| 188 | |---------------- |
| 189 | {{{#!td style="vertical-align:top" |
| 190 | [=#radiation_scheme '''radiation_scheme'''] |
| 191 | }}} |
| 192 | {{{#!td style="vertical-align:top" |
| 193 | C*10 |
| 194 | }}} |
| 195 | {{{#!td style="vertical-align:top" |
| 196 | 'clear-sky' |
| 197 | }}} |
| 198 | {{{#!td |
| 199 | Radiation scheme to be used. |
| 200 | |
| 201 | The user can choose between the following schemes: |
| 202 | |
| 203 | '' 'constant' '' |
| 204 | |
| 205 | A constant net radiation at the surface is prescribed (see [#net_radiation]). |
| 206 | |
| 207 | |
| 208 | '' 'clear-sky' '' |
| 209 | |
| 210 | A simple clear sky model is used to calculate the radiation fluxes at the surface (shortwave incoming, shortwave outgoing, longwave incoming, longwave outgoing) and consequently the net radiation at the surface. This scheme requires setting [#albedo albedo], [../inipar#day_of_year_init day_of_year_init], [#lambda lambda], [wiki:doc/app/inipar#phi phi], and [../inipar#time_utc_init time_utc_init]. |
| 211 | |
| 212 | |
| 213 | '' 'rrtmg' '' |
| 214 | |
| 215 | The [http://rtweb.aer.com/rrtm_frame.html RRTMG model] is used to calculate the radiative heating rates for each model column. This scheme requires setting [../inipar#day_of_year_init day_of_year_init], [#lambda lambda], [wiki:doc/app/inipar#phi phi], [../inipar#time_utc_init time_utc_init]. The following parameters can be set optionally: [#albedo_type albedo_type] (and/or [#albedo_lw_dif albedo_lw_dif], [#albedo_lw_dir albedo_lw_dir], [#albedo_sw_dif albedo_sw_dif], [#albedo_sw_dir albedo_sw_dir]). [#constant_albedo constant_albedo] can be used to fix the albedo during the simulation. It is also possible to use the switches [#lw_radiation lw_radiation] and [#sw_radiation sw_radiation]. |
| 216 | |
| 217 | Please note that the use of RRTMG requires to compile PALM with {{{__rrtmg}}} preprocessor directive. By the same token it is not possible to switch the radiation scheme to 'clear-sky' or 'constant' for such a compiled PALM executable. |
| 218 | }}} |
| 219 | |---------------- |
| 220 | {{{#!td style="vertical-align:top" |
| 221 | [=#skip_time_do_radiation '''skip_time_do_radiation'''] |
| 222 | }}} |
| 223 | {{{#!td style="vertical-align:top" |
| 224 | R |
| 225 | }}} |
| 226 | {{{#!td style="vertical-align:top" |
| 227 | 0.0 |
| 228 | }}} |
| 229 | {{{#!td |
| 230 | Time after which the radiation model is switched on. This parameter can be used to allow the LES model to develop turbulence before it is affected by radiation. |
| 231 | }}} |
| 232 | |---------------- |
| 233 | {{{#!td style="vertical-align:top" |
| 234 | [=#sw_radiation '''sw_radiation'''] |
186 | | Parameter to switch off longwave radiation. |
187 | | |
188 | | When using RRTMG, longwave radiation calls can be switched off by setting {{{lw_radiation = .F.}}}. |
189 | | }}} |
190 | | |---------------- |
191 | | {{{#!td style="vertical-align:top" |
192 | | [=#net_radiation '''net_radiation'''] |
193 | | }}} |
194 | | {{{#!td style="vertical-align:top" |
195 | | R |
196 | | }}} |
197 | | {{{#!td style="vertical-align:top" |
198 | | 0.0 |
199 | | }}} |
200 | | {{{#!td |
201 | | Net radiation at the surface in W/m². This parameter is only used in case of [#radiation_scheme radiation scheme]{{{= 'constant'}}}. |
202 | | }}} |
203 | | |---------------- |
204 | | {{{#!td style="vertical-align:top" |
205 | | [=#radiation_scheme '''radiation_scheme'''] |
206 | | }}} |
207 | | {{{#!td style="vertical-align:top" |
208 | | C*10 |
209 | | }}} |
210 | | {{{#!td style="vertical-align:top" |
211 | | 'clear-sky' |
212 | | }}} |
213 | | {{{#!td |
214 | | Radiation scheme to be used. |
215 | | |
216 | | The user can choose between the following schemes: |
217 | | |
218 | | '' 'constant' '' |
219 | | |
220 | | A constant net radiation at the surface is prescribed (see [#net_radiation]). |
221 | | |
222 | | |
223 | | '' 'clear-sky' '' |
224 | | |
225 | | A simple clear sky model is used to calculate the radiation fluxes at the surface (shortwave incoming, shortwave outgoing, longwave incoming, longwave outgoing) and consequently the net radiation at the surface. This scheme requires setting [#albedo albedo], [../inipar#day_of_year_init day_of_year_init], [#lambda lambda], [wiki:doc/app/inipar#phi phi], and [../inipar#time_utc_init time_utc_init]. |
226 | | |
227 | | |
228 | | '' 'rrtmg' '' |
229 | | |
230 | | The [http://rtweb.aer.com/rrtm_frame.html RRTMG model] is used to calculate the radiative heating rates for each model column. This scheme requires setting [../inipar#day_of_year_init day_of_year_init], [#lambda lambda], [wiki:doc/app/inipar#phi phi], [../inipar#time_utc_init time_utc_init]. The following parameters can be set optionally: [#albedo_type albedo_type] (and/or [#albedo_lw_dif albedo_lw_dif], [#albedo_lw_dir albedo_lw_dir], [#albedo_sw_dif albedo_sw_dif], [#albedo_sw_dir albedo_sw_dir]). [#constant_albedo constant_albedo] can be used to fix the albedo during the simulation. It is also possible to use the switches [#lw_radiation lw_radiation] and [#sw_radiation sw_radiation]. |
231 | | |
232 | | Please note that the use of RRTMG requires to compile PALM with {{{__rrtmg}}} preprocessor directive. By the same token it is not possible to switch the radiation scheme to 'clear-sky' or 'constant' for such a compiled PALM executable. |
233 | | }}} |
234 | | |---------------- |
235 | | {{{#!td style="vertical-align:top" |
236 | | [=#skip_time_do_radiation '''skip_time_do_radiation'''] |
237 | | }}} |
238 | | {{{#!td style="vertical-align:top" |
239 | | R |
240 | | }}} |
241 | | {{{#!td style="vertical-align:top" |
242 | | 0.0 |
243 | | }}} |
244 | | {{{#!td |
245 | | Time after which the radiation model is switched on. This parameter can be used to allow the LES model to develop turbulence before it is affected by radiation. |
246 | | }}} |
247 | | |---------------- |
248 | | {{{#!td style="vertical-align:top" |
249 | | [=#sw_radiation '''sw_radiation'''] |
250 | | }}} |
251 | | {{{#!td style="vertical-align:top" |
252 | | L |
253 | | }}} |
254 | | {{{#!td style="vertical-align:top" |
255 | | .T. |
256 | | }}} |
257 | | {{{#!td |