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An Examination of Alternative Extrapolations to Find the Departure Point Position in a “Two-Time-Level” Semi-Lagrangian Integration

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  • 1 Irish Meteorological Service, Dublin, Ireland
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Abstract

An unmeteorological oscillation in the forecast fields produced by a two-time-level semi-Lagrangian and semi-implicit model has been traced to the method used for finding the departure point position. Various alternatives to the traditional method for determining it are examined and tested in a forecast model in order to find the one that removes the unmeteorological oscillation most satisfactorily.

Corresponding author address: Dr. Aidan McDonald, Irish Meteorological Service, Glasnevin Hill, Dublin 9, Ireland.

Email: aidan.mcdonald@met.ie

Abstract

An unmeteorological oscillation in the forecast fields produced by a two-time-level semi-Lagrangian and semi-implicit model has been traced to the method used for finding the departure point position. Various alternatives to the traditional method for determining it are examined and tested in a forecast model in order to find the one that removes the unmeteorological oscillation most satisfactorily.

Corresponding author address: Dr. Aidan McDonald, Irish Meteorological Service, Glasnevin Hill, Dublin 9, Ireland.

Email: aidan.mcdonald@met.ie

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