PartMC  2.6.1
Input File Format: Aerosol Distribution Mode

Read one mode of an aerosol distribution (number concentration, volume fractions, and mode shape).

Parameters
[in,out]fileSpec file.
[in,out]aero_dataAero_data data.
[in,out]aero_modeAerosol mode.
eofIf eof instead of reading data.

An aerosol distribution mode has the parameters:

  • mode_name (string): the name of the mode (for informational purposes only)
  • mass_frac (string): name of file from which to read the species mass fractions — the file format should be Input File Format: Aerosol Mass Fractions
  • diam_type (string): the type of diameter for the mode — must be one of: geometric for geometric diameter; or mobility for mobility equivalent diameter
  • if diam_type is mobility then the following parameters are:
    • temp (real, unit K): the temperate at which the mobility diameters were measured
    • pressure (real, unit Pa): the pressure at which the mobility diameters were measured
  • mode_type (string): the functional form of the mode — must be one of: log_normal for a log-normal distribution; exp for an exponential distribution; mono for a mono-disperse distribution; or sampled for a sampled distribution
  • if mode_type is log_normal then the mode distribution shape is

    \[ n(\log D) {\rm d}\log D = \frac{N_{\rm total}}{\sqrt{2\pi} \log \sigma_{\rm g}} \exp\left(\frac{(\log D - \log D_{\rm gn})^2}{2 \log ^2 \sigma_{\rm g}}\right) {\rm d}\log D \]

    and the following parameters are:
    • num_conc (real, unit 1/m^3): the total number concentration $N_{\rm total}$ of the mode
    • geom_mean_diam (real, unit m): the geometric mean diameter $D_{\rm gn}$
    • log10_geom_std_dev (real, dimensionless): $\log_{10}$ of the geometric standard deviation $\sigma_{\rm g}$ of the diameter
  • if mode_type is exp then the mode distribution shape is

    \[ n(v) {\rm d}v = \frac{N_{\rm total}}{v_{\rm \mu}} \exp\left(- \frac{v}{v_{\rm \mu}}\right) {\rm d}v \]

    and the following parameters are:
    • num_conc (real, unit 1/m^3): the total number concentration $N_{\rm total}$ of the mode
    • diam_at_mean_vol (real, unit m): the diameter $D_{\rm \mu}$ such that $v_{\rm \mu} = \frac{\pi}{6} D^3_{\rm \mu}$
  • if mode_type is mono then the mode distribution shape is a delta distribution at diameter $D_0$ and the following parameters are:
    • num_conc (real, unit 1/m^3): the total number concentration $N_{\rm total}$ of the mode
    • radius (real, unit m): the radius $R_0$ of the particles, so that $D_0 = 2 R_0$
  • if mode_type is sampled then the mode distribution shape is piecewise constant (in log-diameter coordinates) and the following parameters are:

Example:

 mode_name diesel          # mode name (descriptive only)
 mass_frac comp_diesel.dat # mass fractions in each aerosol particle
 mode_type log_normal      # type of distribution
 num_conc 1.6e8            # particle number density (#/m^3)
 geom_mean_diam 2.5e-8     # geometric mean diameter (m)
 log10_geom_std_dev 0.24   # log_10 of geometric standard deviation
 

See also: