Overview

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 SALSA main page.

Example Setups

An example set-up for including SALSA to PALM can be found ​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 simulation domain is the same as in the test case ​urban_environment. This 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 nbin) and the aerosols can contain organic compounds, nitrates and ammonia (see listspec). The following aerosol dynamic porcesses are included: deposition (on both vegetation and other surfaces), condensation and coagulation. The background concentrations for both aerosols and gaseous compounds are defined within the parameter file (see dpg, sigmag, n_lognorm and mass_fracs_a for aerosols and H2SO4_init, HNO3_init, NH3_init, OCNV_init and OCSV_init for gases). The concentrations are set constant at the left and right lateral boundaries (see decycle_method, decycle_lr and decycle_ns) to avoid accumulation of air pollutants with the cyclic boundary conditions for the flow. The aerosol emissions are read from file urban_environment_salsa_salsa.

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)

Furthermore, a dynamic driver urban_environment_salsa_dynamic for initialising the meteorological conditions and background concentrations, as well as setting a time-dependent meteorological forcing, is included. To enable this dynamic input, the following changes are needed in the parameter file:

• In initialization_parameters: nz = 22 --> nz = 60 and initializing_actions = 'set_constant_profiles' --> initializing_actions = 'inifor set_constant_profiles'