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| Titel |
Detection of merger and splitting of extra-tropical cyclones |
| VerfasserIn |
Sarah Kew, John Hanley |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250081908
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| Zusammenfassung |
| Results from the project IMILAST (Intercomparison of mid-latitude storm diagnostics) show
that, despite a wide variety in the 15 cyclone identification and tracking techniques
considered, a reasonable agreement on tracks of intense cyclones can be reached, at least in
the central intensifying stage of the cyclone life cycle. In contrast, diagnostics of cyclone
genesis and lysis events show reduced agreement amongst the methods with genesis and lysis
density maps exhibiting coherence over smaller spatial scales.
Recent work by Hanley and Caballero claims that multi-centre cyclones occur more
frequently as storm intensity increases, with an associated increase in the probability of
spurious splittings by single-centre tracking routines.
We investigate whether the methodological differences in handling of cyclone merger and
splitting are responsible for the range in genesis/lysis outcomes exhibited in IMILAST results
or whether other factors, such as cyclone definition, have more influence over the spread. The
study is focussed on a number of selected cases of intense cyclones that undergo a clear
merger or splitting.
Of the methods contributing to the IMILAST project, three explicitly handle cyclone
merger and splitting. In demonstrating the differences between the techniques, we explore
what each approach has to offer. |
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