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Interactive Tool

last modified 2011-03-19 00:11


This tool is primarily intended for interactive plotting of forecast and campaign products while they are being produced.

The interactive webpage allows custom plotting of FLEXPART Forecast and Analysis products.



The page is under regular development. Please bookmark this page for regular access until such time that we 'freeze' development. If you bookmark the referred link above you may end up on a 'stale' version. Sorry for any inconveniences this causes at this time.

FLEXPART forecast system essentials


Four anthropogenic emission tracers carried for 20 days:
    • CO – purely passive
  • NOx – purely passive
  • SO4 – susceptible to dry and wet deposition
  • BC (Black carbon) – susceptible to dry and wet deposition

Two biomass burning emission tracers:
  • CO – purely passive
  • BC (Black carbon) – susceptible to dry and wet deposition

The removal of BC and oxidized sulfur is likely to be overestimated, since BC is assumed to be hydrophilic from right after the emission, sulfur is assumed to be emitted as sulfate.

The anthropogenic tracers also carry regional information: European, North American, Asian origin.

Input data

0.5°x0.5° resolution GFS data for the real-time analysis and up to 3 hour forecast, 1°x1° resolution GFS data for the forecast; the forecasts strongly benefit from the high-resolution 0.5°x0.5° analyses!

26 vertical levels, every 3 hours

Output resolution

1°x1° globally, 0.25°x0.25° over Europe (10°W-40°E, 40°N-90°N)

16 vertical levels, every 3 hours

Update frequency and timing

4 times daily; forecasts will be started ca. 4 hours after analysis time and will be available ca. 8 hours after analysis time, i.e., forecasts based on 0-UTC meteorological analysis will be available at about 8 UTC (±1 hour, depending on the tracer).

A note about the pole

Since grid cells become very small near the pole, the particle counting statistics (which depend on the number of particles residing in a grid cell) become worse towards the pole, especially when concentrations are low. This leads to somewhat noisy concentration fields just around the pole. However, the transport of the particles itself is not affected by this – FLEXPART does not have any numerical problems near the poles. Just disregard that the output is somewhat more noisy around the pole, which is just due to the extremely high resolution of the output grid around the pole.


This page is based on original versions by Sabine Eckhardt, Caroline Forster and Owen Cooper. Please direct all questions, or report any problems to John Burkhart. In case of problems please send the values you have entered on the interactive webpage.

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