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| Titel |
Comparing different methods to detect and track Northern Hemisphere midlatitude cyclones |
| VerfasserIn |
C. C. Raible, P. Della-Marta, C. Schwierz, H. Wernli, R. Blender |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023653
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| Zusammenfassung |
| The applicability of three different cyclone detection and tracking schemes is investigated in
ECMWF (ERA-40). Cyclone climatologies and cyclone characteristics are intercompared
within the three methods. The comparison of the methods is based on the ERA-40 data set
and shows a generally good correspondence between different schemes. However, trends in
cyclone characteristics, like the number of cyclones, are sensitive to the detection and
tracking scheme used. Moreover, there are two technical aspects, differences in criteria of the
cyclone identification and different approaches in cyclone tracking. Differences in both lead
to deviations in cyclone length. Applying life-time thresholds, some of the cyclone tracks
might be too short to be included in statistical measures of cyclones. Thus, it is
often not clear which scheme is correct or wrong. Nevertheless, consequences of
these differences in the mean cyclone characteristics are minor, but for specific
research questions, e.g., what is the cyclone activity in the Mediterranean in winter, the
users should be aware of these potential differences and if necessary adjust their
scheme. |
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