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| Titel |
CycloTRACK (v1.0) – tracking winter extratropical cyclones based on relative vorticity: sensitivity to data filtering and other relevant parameters |
| VerfasserIn |
E. Flaounas, V. Kotroni, K. Lagouvardos, I. Flaounas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 4 ; Nr. 7, no. 4 (2014-08-29), S.1841-1853 |
| Datensatznummer |
250115687
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| Publikation (Nr.) |
 copernicus.org/gmd-7-1841-2014.pdf |
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| Zusammenfassung |
| In this study we present a new cyclone identification and tracking
algorithm, cycloTRACK. The algorithm describes an iterative process. At each
time step it identifies all potential cyclone centers, defined as relative
vorticity maxima embedded in smoothed enclosed contours of at least
3 × 10−5 s−1 at the atmospheric level of 850 hPa. Next, the algorithm
finds all the potential cyclone paths by linking the cyclone centers at
consecutive time steps and selects the most probable track based on the
minimization of a cost function. The cost function is based on the average
differences of relative vorticity between consecutive track points, weighted
by their distance. Last, for each cyclone, the algorithm identifies "an
effective area" for which different physical diagnostics are measured, such
as the minimum sea level pressure and the maximum wind speed. The algorithm
was applied to the ERA-Interim reanalyses for tracking the Northern
Hemisphere extratropical cyclones of winters from 1989 until 2009, and we
assessed its sensitivity for the several free parameters used to perform the
tracking. |
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