| 22 | | Currently PALM-4U includes the following sample of chemistry mechanisms:\\ |
| 23 | | * cbm4: Carbon Bond Mechanism (Gery et al. (1989), 32 compounds, 81 reactions)\\ |
| 24 | | * smog: Photochemical smog mechanism (13 compounds, 12 reactions)\\ |
| 25 | | * simple: Simplified version of SMOG (9 compounds, 7 reactions)\\ |
| 26 | | * simplep: 'simple' plus one tracer named PM10 (10 compounds, 7 real reactions plus one dummy 'reaction')\\ |
| 27 | | * phstat: Photo-stationary state (3 compounds, 2 reactions)\\ |
| 28 | | * phstatp: Photo-stationary state plus one passive tracer named PM10 (4 compounds, 2 real reactions plus one dummy 'reaction')\\ |
| 29 | | |
| 30 | | Additional 'mechanisms' are available that describe the transport of one or two passive tracers, i.e. no chemical reactions are necessary:\\ |
| 31 | | * passive1: Passive tracers (1 compound, 0 reactions)\\ |
| 32 | | * passive: Passive tracers (2 compounds, 0 reactions)\\ |
| 33 | | This list will be extended further in the future. |
| 34 | | |
| 35 | | The standard mechanism which is in the SOURCE directory is 'phstatp'. |
| 36 | | |
| 37 | | In order to select and apply a certain mechanism from this sample, please copy the respective ready-to-use `chem_gasephase_mod.f90` from `UTIL/chemistry/gasphase_preproc/mechanisms/def_MECH` (where `MECH` stands for any of the available mechanisms) into the USER_CODE directory of the respective simulation Setup, i.e. .../JOBS/<run_identifier>/USER_CODE/chem_gasphase_mod.f90. |
| 38 | | |
| 39 | | Alternatively, the chemistry preprocessor can be executed also for the available machanism in order to create `chem_gasphase_mod.f90` (although for the available mechanisms this is not necessary because the `chem_gasphase_mod.f90` files are already existing) instead of copying `chem_gasphase_mod.f90`: Enter the directory `UTIL/chemistry/gasphase_preproc` and apply the run script, i.e. {{{run_kpp4palm.ksh -m MECH}}}, where `MECH` stands for any of the mechanisms listed above. The resulting `chem_gasphase_mod.f90` will be copied by the script directly into the SOURCE directory. |
| 40 | | |
| 41 | | In order to find out which reactions and compounds are included in the different mechanisms, please have a look into the files MECH.eqn and MECH.spc in `UTIL/chemistry/gasphase_preproc/mechanisms/def_MECH`. |
| 42 | | |
| 43 | | How to implement a new chemical mechanism or add further passive tracers see the [wiki:chempar#no1 Readme-File]. If more than two passive tracers or different names of the passive tracers are desired, a new 'mechanism' must be created as described in the Readme file. The Readme file is also available in the PALM-4U subdirectory `UTIL/chemistry/gasphase_preproc`. |
| | 22 | [MECHANISM] |
