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File structure for time dependent input

Last modified by Petri Clusius on 2024/09/30 12:43

Input file formats

Format of the ENV and MCM input files

There are three example files in the directory ModelLib/Examples. "env180411.dat" and "voc180411.dat" have similar structure, since they hold similar information: one-dimensional time series of different variables. File "dm180411.sum" is a particle size distribution time series, and it's data is in two dimensions.

InputFormat.png

Format of the "BG particles" file

The ideal file is similar to what is used for SMEAR stations dmps measurement files, as shown in the figure below:

BGFormat.png

where di is the particle diameter in meters. If the second column starts with 0, it is ignored, otherwise it is treated as a size bin. This is because often in particle measurements their .sum-files (for example the ones from SMEAR stations) use the second column to store the total particle count, which is not used in ARCA. The actual time values in the input file are ignored, but the time interval must be same for the whole file. The time interval  (by default 10 minutes) can be defined where the "BG Particles" -file is set. ARCA assumes that the second row (first measurement row) starts with the values at t=0 (model time) and proceeds from there with the given interval. The concentrations must be given as log-normalized concentrations, explained here.