The potential vorticity is used to diagnose the interaction between the Plateau Vortex (PV) and the Southwest Vortex (SWV) during the period of 28 June to 2 July 2013. According to the Hoskins potential vorticity theory, analyzed the vortex, height field and wind field of low vortex center position difference, verify the PV and SWV's intensity of movement of the change. The results show that when the form of vortex, the vorticity center are located in the west side of low vortex center of height field and wind field. The PV spread eastward,the intensity of strengthening. When the PV into the Sichuan Basin, the intensity weakening. Before the interaction, with PV moving eastward the downdraft can inhibit the development the SWV. When the PV removed the Tibetan Plateau,the PV interacts with the development of SWV. The vertical cross-section of potential vorticity can reflects PV interaction process with SWV and their movements, but also can be used to indicate changes in the intensity of the cyclone center. Analyses of isentropic potential vorticity indicate that the horizontal isentropic can well reflect the PV and the SWV interaction process.
QIU Jingya
,
LI Guoping
,
HAO Liping
. Diagnostic Analysis of Potential Vorticity on a Heavy Rain in Sichuan Basin under Interaction between Plateau Vortex and Southwest Vortex[J]. Plateau Meteorology, 2015
, 34(6)
: 1556
-1565
.
DOI: 10.7522/j.issn.1000-0534.2014.00117
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