Output File Format: Aerosol Particle State

Write full state.

Parameters

[in]	aero_state	aero_state to write.
[in]	ncid	NetCDF file ID, in data mode.
[in]	aero_data	aero_data structure.
[in]	record_removals	Whether to output particle removal info.
[in]	record_optical	Whether to output aerosol optical properties.

The aerosol state consists of a set of individual aerosol particles, each with its own individual properties. The properties of all particles are stored in arrays, one per property. For example, aero_absorb_cross_sect(i) gives the absorption cross section of particle number i, while aero_particle_mass(i,s) gives the mass of species s in particle i. The aerosol species are described in Output File Format: Aerosol Material Data.

Each aerosol particle i represents a number concentration given by aero_num_conc(i). Multiplying a per-particle quantity by the respective number concentration gives the concentration of that quantity contributed by the particle. For example, summing aero_particle_mass(i,s) * aero_num_conc(i) over all i gives the total mass concentration of species s in kg/m^3. Similarly, summing aero_absorb_cross_sect(i) * aero_num_conc(i) over all i will give the concentration of scattering cross section in m^2/m^3.

FIXME: the aero_weight is also output

The aerosol state uses the aero_species NetCDF dimension as specified in the Output File Format: Aerosol Material Data section, as well as the NetCDF dimension:

• aero_particle: number of aerosol particles

The aerosol state NetCDF variables are:

• aero_particle (dim aero_particle): dummy dimension variable (no useful value)
• aero_particle_mass (unit kg, dim aero_particle x aero_species): constituent masses of each aerosol particle - aero_particle_mass(i,s) gives the mass of species s in particle i
• aero_n_orig_part (dim aero_particle x aero_source): number of original particles from each source that formed each aerosol particle - aero_n_orig_part(i,s) is the number of particles from source s that contributed to particle i - when particle i first enters the simulation (by emissions, dilution, etc.) it has aero_n_orig_part(i,s) = 1 for the source number s it came from (otherwise zero) and when two particles coagulate, their values of aero_n_orig_part are added (the number of coagulation events that formed each particle is thus sum(aero_n_orig_part(i,:)) - 1)
• aero_particle_weight_group (dim aero_particle): weight group number (1 to aero_weight_group) of each aerosol particle
• aero_particle_weight_class (dim aero_particle): weight class number (1 to aero_weight_class) of each aerosol particle
• aero_absorb_cross_sect (unit m^2, dim aero_particle): optical absorption cross sections of each aerosol particle
• aero_scatter_cross_sect (unit m^2, dim aero_particle): optical scattering cross sections of each aerosol particle
• aero_asymmetry (dimensionless, dim aero_particle): optical asymmetry parameters of each aerosol particle
• aero_refract_shell_real (dimensionless, dim aero_particle): real part of the refractive indices of the shell of each aerosol particle
• aero_refract_shell_imag (dimensionless, dim aero_particle): imaginary part of the refractive indices of the shell of each aerosol particle
• aero_refract_core_real (dimensionless, dim aero_particle): real part of the refractive indices of the core of each aerosol particle
• aero_refract_core_imag (dimensionless, dim aero_particle): imaginary part of the refractive indices of the core of each aerosol particle
• aero_core_vol (unit m^3, dim aero_particle): volume of the optical cores of each aerosol particle
• aero_water_hyst_leg (dim aero_particle): integers specifying which leg of the water hysteresis curve each particle is on, using the MOSAIC numbering convention
• aero_num_conc (unit m^{-3}, dim aero_particle): number concentration associated with each particle
• aero_id (dim aero_particle): unique ID number of each aerosol particle
• aero_least_create_time (unit s, dim aero_particle): least (earliest) creation time of any original constituent particles that coagulated to form each particle, measured from the start of the simulation - a particle is said to be created when it first enters the simulation (by emissions, dilution, etc.)
• aero_greatest_create_time (unit s, dim aero_particle): greatest (latest) creation time of any original constituent particles that coagulated to form each particle, measured from the start of the simulation - a particle is said to be created when it first enters the simulation (by emissions, dilution, etc.)