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General            -            Specific Features            -            Background on Traj. Analysis


Several methodologies nowadays coexist in order to couple concentration data and air mass history. The majority of these are enabled in ZeFir; Potential Source Contribution Function (PSCF), Concentration-Weighted Trajectory (CWT), Concentration Field (CF), Multi-site Merging, and Cluster analysis.

Below is the panel dedicated to trajectory analysis in ZeFir.




Example: Bardarbunga eruption in september 2014. SO2 data in Dundee, Scotland, were retrieved from the Scottish air quality network.
        - Simple plot: trajectories can be easily loaded and plotted. Here, they are colour-coded following SO2 concentrations.

  


        - Concentration-Weighted Trajectory: see background on trajectory analyses for more information about this approach.




       - Cluster analysis: trajectories are averaged into clusters. the 3 graphs are automatically displayed after calculations.