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| Titel |
The identification of Borneo vortex and its synoptic features in boreal winter |
| VerfasserIn |
Bo Pang, Riyu Lu |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139258
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| Publikation (Nr.) |
 EGU/EGU2017-2457.pdf |
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| Zusammenfassung |
| The improved identification of Borneo vortex and its synoptic features are investigated in this paper using the daily ERA-Interim data during boreal winter for the period from 1979 to 2015. The improved method based on wind direction can identify vortex automatically. The results indicate that the average lifetime of a vortex event is 1.6 days, and the vortex mainly locates at middle to lower levels of the troposphere and reaches its strongest vorticity in 850hPa. Vorticity budget analysis reveals that the divergence, horizontal advection and βeffect are responsible for the formation and decay of Borneo vortex. The divergence term, which is related to the strengthened winter monsoon and synoptic wave in the middle latitude, reaches its peak when the vortex generates. However, the horizontal advection andβeffect terms both make positive contribution before the generation, but negative after the generation. Further analysis implies that the βeffect may be associated with the equatorial waves especially the MRG-TD wave. |
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