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- W1680692581 abstract "Isentropic charts exhibit many mesoscale potential vorticity (PV) maxima in the weak background PV field of the lowermost stratosphere. Such PV anomalies are known to act as precursors to cyclogenesis when in the vicinity of the tropopause. A feature-tracking tool is developed and applied to ten consecutive winters of the European Centre for Medium-range Weather Forecasts (ECMWF) Reanalysis (ERA-40) to establish the general characteristics and life cycle of these anomalies and thus shed light on an earlier phase of cyclogenesis. The tool identifies the anomalies as local maxima, whose amplitudes are defined with respect to the surrounding local background PV. The isentropic wind field is used to advect structures forward to the next time step, thus predicting their subsequent position and form. A tracking is enabled when there is a satisfactory overlap between the predicted and observed structures. The routine detects the merger and splitting of PV entities as well as their genesis and lysis." @default.
- W1680692581 created "2016-06-24" @default.
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- W1680692581 date "2009-04-01" @default.
- W1680692581 modified "2023-09-28" @default.
- W1680692581 title "Isentropic tracking of lower-stratospheric potential vorticity anomalies: A 10-year winter climatology" @default.
- W1680692581 hasPublicationYear "2009" @default.
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