Changes between Version 13 and Version 14 of doc/app/chememi


Ignore:
Timestamp:
Mar 26, 2020 5:13:40 PM (5 years ago)
Author:
forkel
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • doc/app/chememi

    v13 v14  
    1616In a third mode traffic emissions are parameterized on the basis of the street type classification provided by Open Street Map ([https://www.openstreetmap.org]) and street type specific emissions factors. This option, named ’Parameterized’ mode, is currently only implemented for the traffic sector:
    1717
    18  • 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 [wiki:doc/app/par Fortran namelist file] and [wiki:doc/app/chemistry_parameters chemistry parameter list]). Furthermore, the street type classification provided by Open Street Map must be included in the PALM static driver (see [wiki:doc/app/iofiles/pids/static Static input file])
     18 • 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 [wiki:doc/app/par Fortran namelist file] and [wiki:doc/app/chemistry_parameters chemistry parameter list]). Furthermore, the street type classification provided by Open Street Map must be included in the PALM static driver (see [wiki:doc/app/iofiles/pids/static Static input file]).
     19
     20To 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.
     21
     22Please note that LOD 0 is currently not applicable if the horizontal grid exceeds 10 to 15 m at maximum (depending on the width of the streets in the considered area). In this context, it must also be considered, that streets, which are only one grid point wide will probably be eliminated the topography filtering during runtime, i.e. emissions from steets which are only one grid point wiede will be supressed.
    1923 
    20 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.