== Overview ==
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[[NoteBox(note,This page is part of the **Aerosol model** (SALSA) documentation. \\ It contains a description of SALSA. \\ For an overview of all SALSA-related pages\, see the **[wiki:doc/tec/aerosol SALSA main page]**.)]]

== Example Setups ==

An example set-up for including SALSA to PALM can be found [https://palm.muk.uni-hannover.de/trac/browser/palm/trunk/TESTS/cases/urban_environment_salsa here]. This test set-up called "urban_environment_salsa" is for a very small urban area and can thus be run on a personal computer. The features of the set-up are following:

* The simulation domain is the same as in the test case [https://palm.muk.uni-hannover.de/trac/browser/palm/trunk/TESTS/cases/urban_environment urban_environment] and the set-up has been extended by enabling SALSA and introducing aerosol and gas emissions above streets and background air pollutant concentrations.
* In SALSA, the aerosol size distribution is represented with 8 size bins (see [wiki:/doc/app/salsa_parameters#nbin nbin]) and the aerosols can contain organic compounds, nitrates and ammonia (see [wiki:/doc/app/salsa_parameters#listspec listspec]).
* The following aerosol dynamic processes are included: deposition (on both vegetation and other surfaces), condensation and coagulation.
* The background concentrations for both aerosols and gaseous compounds are read from a dynamic driver ([wiki:/doc/app/initialization_parameters#initializing_actions initializing_actions] = 'inifor set_constant_profiles'). If instead one wants to define the background concentrations within the parameter file, one must set [wiki:/doc/app/initialization_parameters#initializing_actions initializing_actions] = 'set_constant_profiles'. See [wiki:/doc/app/salsa_parameters#dpg dpg], [wiki:/doc/app/salsa_parameters#sigmag sigmag], [wiki:/doc/app/salsa_parameters#n_lognorm n_lognorm] and [wiki:/doc/app/salsa_parameters#mass_fracs_a mass_fracs_a] for aerosols and [wiki:/doc/app/salsa_parameters#H2SO4_init H2SO4_init], [wiki:/doc/app/salsa_parameters#HNO3_init HNO3_init], [wiki:/doc/app/salsa_parameters#NH3_init NH3_init], [wiki:/doc/app/salsa_parameters#OCNV_init OCNV_init] and [wiki:/doc/app/salsa_parameters#OCSV_init OCSV_init] for gases. 
* The concentrations are set constant at the left and right lateral boundaries (see [wiki:doc/app/salsa_parameters#bc_aer_l bc_aer_l] and [wiki:doc/app/salsa_parameters#bc_aer_r bc_aer_r]) to avoid accumulation of air pollutants to the domain when cyclic boundary conditions are applied for the flow. 
* Surface emissions are enabled and they are read from a file ([wiki:doc/app/salsa_parameters#salsa_emission_mode salsa_emission_mode]  = 'read_from_file').

The following input files are included:
  * {{{urban_environment_salsa_p3d}}}:  Parameter file
  * {{{urban_environment_salsa_static}}}:  Static driver including information on topography, vegetation and land use
  * {{{urban_environment_salsa_salsa}}}:  Input file for aerosol emissions (with the level of detail 2)
  * {{{urban_environment_salsa_chemistry}}}:  Input file for gaseous emissions (with the level of detail 2)
  * {{{urban_environment_salsa_dynamic}}}: Dynamic driver including the initial meteorological conditions and background concentrations, as well as time-dependent forcing for meteorological variables and aerosol and gas concentrations.