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| Titel |
Multi-scale analysis of heavy rainfall systems |
| VerfasserIn |
Chi Yan Tsui, Yaping Shao |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091834
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| Publikation (Nr.) |
 EGU/EGU2014-6148.pdf |
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| Zusammenfassung |
| The aim of this work is to study the cross-scale interactions with focus on mesoscale
convective system. A multi-scale analysis of a heavy rainfall event is carried out by dividing
the responsible systems into large, middle and small scales. The three distinctive scales
correspond respectively to upper- and low-level jets, meso-scale convective systems and
convective cells.
The governing equations for the three scales are derived and then simplified to their bare
essence to illustrate the cross-scale interactions. In particular, the cross-scale transfers of
momentum and heat are retained in the equations to illustrate the interactions between the
large and small scale motions with the mesoscale system.
WRF has been used to simulate a heavy rainfall event in southeast China and the
model results are used to test the theory of the multi-scale interactions. Overall,
the theory shows a plausible mechanism that the meso-scale convective system
is responsible for the vertical momentum transfer from the upper level jet to the
lower level jet which maintains the low-level positive vorticity of the convective
system. The low-level jet also carries large quantities of moisture from the South
China Sea to Southeast China, which are necessary for small scale convections. |
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