Symmetric Infinite Impulse Response filtering: methods and application on ocean inertial waves

Damien Allain (1)

1 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales

Symmetric Infinite Impulse Response (IIR) filters have been designed to filter geo- physical time series, in particular to remove the signature of Inertial Waves (IWs) as it is often so strong it disturbs the observations and analyses of other phenomena. As the symmetric filters are based on IIR digital filters, their computational costs are reduced to a minimum and their parameters can be adapted to all latitudes when used on IWs. The Symmetric Band-Cut (SBC) filter has been tested. The results show that the SBC filter can remove a lot of the signal from IWs but that a good understanding of the filter is necessary to interpret its output, as it shows transition and boundary effects. For that reason, a synthetic case has been presented to enable users to get the best understanding of the filter.

Mots clés: IIR filtering; inertial waves

Domaines: Océan, Atmosphère

Damien Allain. Symmetric Infinite Impulse Response filtering: methods and application on ocean inertial waves. 2014. ⟨hal-01023171⟩