PartMC 2.1.2
Input File Format: Gas Profile

A gas profile input file must consist of three or more lines, consisting of:

The units of the species lines depends on the type of gas profile:

The species names must be those specified by the Input File Format: Gas Material Data. Any species not listed are taken to be zero.

The scaling parameter is used to multiply all the gas state values at the corresponding time, giving a simple way of scaling the overall gas state.

Between the specified times the gas profile is interpolated step-wise and kept constant at its last value. That is, if the times are $t_i$, the rates are $r_i$, and the gas states are $g_i$ (all with $i = 1,\ldots,n$), then between times $t_i$ and $t_{i+1}$ the gas state is constant at $r_i g_i$. Before time $t_1$ the gas state is $r_1 g_1$, while after time $t_n$ it is $r_n g_n$.

Example: an emissions gas profile could be:

 time   0       600     1800    # time (in s) after simulation start
 rate   1       0.5     1       # scaling factor
 H2SO4  0       0       0       # emission rate in mol/(m^2 s)
 SO2    4e-9    5.6e-9  5e-9    # emission rate in mol/(m^2 s)
 

Here there are no emissions of $\rm H_2SO_4$, while $\rm SO_2$ starts out being emitted at $4\times 10^{-9}\rm\ mol\ m^{-2}\ s^{-1}$ at the start of the simulation, before falling to a rate of $2.8\times 10^{-9}\rm\ mol\ m^{-2}\ s^{-1}$ at 10 min (note the scaling of 0.5), and then rising again to $5\times 10^{-9}\rm\ mol\ m^{-2}\ s^{-1}$ after 30 min. Between 0 min and 10 min the emissions are the same as at 0 min, while between 10 min and 30 min they are the same as at 10 min. After 30 min they are held constant at their final value.

See also: