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**Scripts for processing of WRF-CHEM files to PALM dynamic driver.**
The scripts are based on the [wrf-CAMx interface](https://palm.muk.uni-hannover.de/trac/wiki/doc/app/iofiles/wrf_interface)
The optional parameter -w allows to skip horizontal and vertical
interpolation in case it is already done.
Example: python3 palm_dynamic.py -c augsburg_validation_summer_10
The script requires name of the case configuration on the command line.
The corresponding configuration files are placed in subdirectory
"configuration" and they are named <config_name>.conf. The values which
agree with defaults need not be present in the user config. The file
palm_dynamic_init.py contains setting and calculation of standard
initialization values for particular system and can be adjusted.
- [numpy](https://pypi.org/project/numpy)
- [scipy](https://pypi.org/project/scipy)
- [pyproj](https://pypi.org/project/pyproj)
- [netCDF4](https://pypi.org/project/netCDF4)
- [metpy](https://unidata.github.io/MetPy)
In the current version, the only supported projection in WRF-CHEM is
Lambertiam conformal conic, which is WRF default and recommended projection for
mid-latitudes.
The scripts support both variants of WRF-CHEM vertical levels - the sigma levels
(default until WRF version 3.*) and the hybrid levels (default since WRF 4.*).
However, it is necessary to correctly configure this option via the setting
"wrf_hybrid_levs = True/False".
Description of the particular configuration options are (defaults are in parenthesis):
## 1. Domain and case related configurations
- domain name of the simulation case ("")
- resolution name of the particular domain resolution scenario ("")
- scenario name of the individual scenario in the case ("")
- nested_domain False indicates parent and True nested domain. (False)
- dynamic_driver_file file name of output dynamic driver ("").
- grid_from_static True - the grid parameters are imported from the static driver, False - they are prescribed in the config (True)
- static_driver_file file name of the static driver in case of grid_from_static ("").
- proj_palm reference coordinate system of PALM simulation ("EPSG:32633")
- proj_wgs84 reference coordinate system of lon-lat projection ("EPSG:4326")
- dz height of the PALM vertical grid layer (0.0). The default value dz = 0.0 means dz is assigned from dx.
- nz number of vertical layers of PALM domain (200)
- dz_stretch_level height in meters from which stretching of vertical levels starts in PALM (5000.0)
- dz_stretch_factor coefficient of the stretching of the vertical layers in PALM (1.0)
- dz_max max height of the stretched vertical layers (100.0)
- origin_time origin time of the PALM simulation in the format YYYY-MM-DD hh:mm:ss (""). The default value "" means that the value is read from the global attribute of the static driver.
- simulation_hours extent of the simulation in hours
## 2. WRF-CHEM related configurations
- wrf_dir_name file path of the wrf-chem input files ("").
- wrf_file_mask file mask of the wrf-chem input files ("wrfout_*.e000")
- wrf_hybrid_levs True means hybrid levels in WRF files, False means sigma levels (True).
- vinterp_terrain_smoothing
- the standard deviation for Gaussian kernel of smoothing method of the PALM terrain for WRF vertical interpolation to avoid sharp horizontal gradients. Value None disables the smoothing. (None)
- interp_dir_name file path to interpolated files
- wrfchem_spec wrf-chem chemical species to be included in dynamic driver, list of gaseous species: no, no2, no3, pm10, PM2_5_DRY, o3, co, hno3, ho, h2o2, nh3
- aerosol_wrfchem True means aerosols are included, (False)
- wrfchem_bin_limits wrf-chem aerosol siz bins `[3.9e-8, 1.56e-7, 6.25e-7, 2.5e-6, 1.0e-5]`
- listspec PALM aerosol species, only aerosols, options `listspec = ['SO4', 'OC', 'BC', 'DU', 'SS', 'NH', 'NO']`
- nbin SALSA parameter, # size bins in subrange `[1,7]`
- reglim SALSA parameter, subrange limits `[3.9e-8, 5.0e-8, 2.5e-6]`
- nf2a SALSA parameter, insoluble fraction, currently only soluble supported in PALM (1.0)
- radiation_from_wrf enable or disable processing of radiation from WRF files (True).
- wrf_rad_file_mask file mask of the wrf radiation input files ("auxhist6_*"). The default setting reads radiation from WRF auxiliary history files. This setting allows to use finer time step for WRF radiation outputs than for other values.
- radiation_smoothing_distance smoothing distance for radiation values in m (10000.0).
## 3. Horizontal parameters of the PALM domain which have to be set in case of grid_from_static = False
- nx, ny number of horizontal grids of the domain in x and y directions
- dx, dy grid cell size of the domain in x and y directions
- origin_x, origin_y origin x and y of the domain
- origin_z origin of the domain in the vertical direction
### Major Changes from wrf + CAMx scripts made to wrf_chem_for_palm
- Proj future warning resolved
- Chemical species are read from wrf-chem files and interpolated at the same time as the dynamic variables
- Interpolated files are saved to a different directory than the wrf-chem data files
- A variety of chemical species can be inlcuded.
- Aerosols can be included and are weighted based on specified aerosol size bins
- Base state temperature corrected to 290. for WRFChem
- Changes to palm_dynamic_output were made to include the various aerosol and chemical species