Application and Research of Potential Vorticity in the Analysis for Rainstorm Caused by Landing Typhoon in Shandong Province;

A diagnostic study is conducted from a potential vorticity or "PV thinking" perspective using NCAR/NCEP 6 hourly reanalysis data.

The three-dimensional structure of two landfalling typhoon,Jelawat and Bilis(2000),during their formations is discussed based on the NCEP/NCAR global tropospheric 1°×1°analysis,using tangential average wind profile,vertical velocity and potential vorticity.

A new model named vortex-particle coupling for the simulation of fine particle dispersion in flow field is developed and applications to several particulate flows are carried out with Largrange method.

The results show that the high potential vorticity,dry air from the upper level of troposphere extended downwards and southwards,which increased the vertical component of the vorticity on the steep iso-entropy plane and promoted the rapid development of the low level cyclone,resulted in a low level jet and the intensive convergence in .

Based on the reanalysis data of NCEP 1°×1°,the diagnostic analysis on potential vorticity,dry intrusion and vertical helicity of a sand-dust storm process occurred in the west of Gansu and Inner Mongolia and the south of Mongolia during period from Oct.

An extraordinary ozone enhancement event is observed at Lin-An (30 30°N, 119 75°E) from March 25 to 31 in the spring of 2001, especially on March 29 and 30 The cause of the ozone enhancement is studied utilizing synoptic meteorology diagnosis from conventional weather data and the NCEP data, as well as potential vorticity (PV).

With the 1°×1° NCEP reanalysis data and the ground surface rainfall data,using the potential vorticity(PV) analysis and PV inversion methodology,the evolution of main synoptic systems,and corresponding PV and PV perturbations(or PV anomalies) and their relationship with heavy rainfall along the meiyu front are analyzed in order to i.

Potential vorticity inversion (hereafter, referred as PV inversion) technology is regarded to be successful in distinguishing the above two modes of motion.

With the confirmation of the importance of the potential vorticity inversion (hereafter, referred as PV inversion) technology, the authors point out this technology have deficiency in meso-scale systems research and the higher-order PV inversion operator needs to be developed for these issues.

An Analysis of Moist Potential Vorticity for Early Typhoon Rainstorm;

Diagnostic analysis of moist potential vorticity for local heavy rain

Based on the analysis of moist potential vorticity(mpv) for the typhoon "Haitang" inverted trough which caused rainstorm in Henan province,the results show that slantwise vorticity development is one of the important mechanisms of the rainstorm occurrence and intensification.