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GfsEventFilter applies "exponential" filtering to a given variable.

The syntax in parameter files is as follows:

[ GfsEvent ] V TSCALE

where V is a variable and TSCALE is a strictly positive number. At every realisation of the event, variable V is replaced by (1 - a)*V + a*VF, where a = dt/TSCALE, dt is the timestep and VF is the filtered variable obtained by corner-value averaging.


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