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Overview
TracNav
Core Parameters
Module Parameters
- Agent system
- Aerosol (Salsa)
- Biometeorology
- Bulk cloud physics
- Chemistry
- FASTv8
- Indoor climate
- Land surface
- Nesting
- Nesting (offline)
- Ocean
- Particles
- Plant canopy
- Radiation
- Spectra
- Surface output
- Synthetic turbulence
- Turbulent inflow
- Urban surface
- User-defined
- Virtual flights
- Virtual measurements
- Wind turbine
- Alphabetical list (outdated!)
This page is part of the Chemistry Model (CHEM) documentation.
It contains [...] .
For an overview of all CHEM-related pages, see the CHEM main page.
This page is under construction.
Emissions of gases and/or passive compounds can be provided by the user in different levels of detail (LOD). Three modes were implemented. Two modes require emission data from file. Gridded emission information can be provided in two LODs via a netCDF file (see also https://palm.muk.uni-hannover.de/trac/wiki/doc/app/iofiles/pids):
- LOD 1 files require annual emission information which are temporally disaggregated by PALM-4U using sector-specific standard time factors
- LOD 2 files must contain pre-processed emission information that is already temporally disaggregated. At the moment hourly emission data is required. Other temporal intervals will be possible in later versions. IMPORTANT: In this mode the initial date of the simulation has to coincide with the first day for which emission values are available.
In a third mode traffic emissions are parameterized on the basis of the street type classification provided by OpenStreetMap? (https://www.openstreetmap.org) and street type specific emissions factors. This option, named ’Parameterized’ mode, is currently only implemented for the traffic sector:
- LOD 0 requires a mean surface emission per day (in micromol/m2/d for gases and in kg/m2/d for particulate matter) for each desired species contained in the applied chemical mechanism together with a weight differing between main and side road emissions defined in the PALM Fortran namelist file (see also https://palm.muk.uni-hannover.de/trac/wiki/doc/app/par and https://palm.muk.uni-hannover.de/trac/wiki/doc/app/chemistry_parameters). Furthermore, the street type classification provided by OpenStreetMap? must be included in the PALM static driver (see also https://palm.muk.uni-hannover.de/trac/wiki/doc/app/iofiles/pids/static)
To account for the temporal distribution of the parameterized traffic emissions a diurnal profile based on urban traffic counts is implemented to disaggregate the total emission of the different species to hourly values. Currently, the applied temporal profile is the same for all species and main and side roads.
