-
Abstract
By using the high-resolution observation data and MM5 model simulation data, the analysis on the 12
June 2008 Guangxi flash-flood rainstorm shows that the associated major mesoscale weather system of this
event is a quasi-stationary mesoscale vortex, which resulted from the interaction between the midlatitude
synoptic-scale waves in the westerly belt and the low-latitude warm-moist flow under the terrain effect. The
genesis, development, and movement of the mesoscale vortex have significant impacts on the intensity and
persistence of the severe precipitation from the Guangxi flash-flood rainstorm. This vortex is characterized
by the coexistence of strong vorticity and divergence with the same order of magnitude. Well organized,
deep, and moist convection was observed for a long period of time, and was produced by the interaction
between the mesoscale vortex and the gravity waves. The latter was generated by the terrain effect and the
ageostrophic effect of high winds in the low-level jet. According to the quasi-balanced dynamical theory,
quasi-balanced flow must have existed in the mesoscale motions with both divergent and rotational winds.
Thus, based on the diagnosis of the quasi-balanced flow, the PV-ωinversion method is employed to analyze
the organized moist convection. The results show that 50%-70% of the vertical circulation in the rainstorm
areas was quasi-balanced, so the quasi-balanced flow could well reflect features of the strong vertical motions
associated with the coexistence of vorticity and divergence during this event.
-
-
Citation
GE Jingjing, ZHONG Wei, LU Hancheng. 2011: Diagnostic Analysis of the Quasi-Balanced Flow of a Mesoscale Vortex During the 12 June 2008 Guangxi Rainstorm. Journal of Meteorological Research, 25(2): 188-202. DOI: 10.1007/s13351-011-0026-7
GE Jingjing, ZHONG Wei, LU Hancheng. 2011: Diagnostic Analysis of the Quasi-Balanced Flow of a Mesoscale Vortex During the 12 June 2008 Guangxi Rainstorm. Journal of Meteorological Research, 25(2): 188-202. DOI: 10.1007/s13351-011-0026-7
|
GE Jingjing, ZHONG Wei, LU Hancheng. 2011: Diagnostic Analysis of the Quasi-Balanced Flow of a Mesoscale Vortex During the 12 June 2008 Guangxi Rainstorm. Journal of Meteorological Research, 25(2): 188-202. DOI: 10.1007/s13351-011-0026-7
GE Jingjing, ZHONG Wei, LU Hancheng. 2011: Diagnostic Analysis of the Quasi-Balanced Flow of a Mesoscale Vortex During the 12 June 2008 Guangxi Rainstorm. Journal of Meteorological Research, 25(2): 188-202. DOI: 10.1007/s13351-011-0026-7
|
Export: BibTex EndNote
Article Metrics
Article views:
PDF downloads:
Cited by: