Changes between Version 20 and Version 21 of doc/app/radiation_parameters
- Timestamp:
- Oct 13, 2017 6:20:25 PM (7 years ago)
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doc/app/radiation_parameters
v20 v21 132 132 |---------------- 133 133 {{{#!td style="vertical-align:top" 134 [=#day_init '''day_init''']135 }}}136 {{{#!td style="vertical-align:top"137 I138 }}}139 {{{#!td style="vertical-align:top"140 172141 }}}142 {{{#!td143 Day of the year (1-365) at model start. The default value is 172 (June 21).144 }}}145 |----------------146 {{{#!td style="vertical-align:top"147 134 [=#dt_radiation '''dt_radiation'''] 148 135 }}} … … 236 223 '' 'clear-sky' '' 237 224 238 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], [ #day_init day_init], [#lambda lambda], [wiki:doc/app/inipar#phi phi], and [#time_utc_init time_utc_init].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]. 239 226 240 227 241 228 '' 'rrtmg' '' 242 229 243 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 [ #day_init day_init], [#lambda lambda], [wiki:doc/app/inipar#phi phi], [#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].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]. 244 231 245 232 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. … … 273 260 When using RRTMG, shortwave radiation calls can be switched off by setting {{{sw_radiation = .F.}}}. Note that shortwave radiation is automatically switched off during nighttime. 274 261 }}} 275 |----------------276 {{{#!td style="vertical-align:top"277 [=#time_utc_init '''time_utc_init''']278 }}}279 {{{#!td style="vertical-align:top"280 R281 }}}282 {{{#!td style="vertical-align:top"283 43200.0284 }}}285 {{{#!td286 UTC time at model start in seconds starting from midnight, The default value is {{{43200.0}}} (12 p.m., noon).287 }}}