A Case Study of Plateau Vortex Moving East Ward with HeavyRainfalls Based on Helicity and Non\|Geostrophic Wet Q-Vector

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Plateau Meteorology
Plateau Meteorology ›› 2009, Vol. 28 ›› Issue (2) : 319-326.

A Case Study of Plateau Vortex Moving East Ward with HeavyRainfalls Based on Helicity and Non\|Geostrophic Wet Q-Vector

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Abstract

Using NCEP global 1°×1° final\|analysis data and the routine observation data， with the theories of helicity and non\|geostrophic wet Q\|vector, a case of Plateau vortex moving east which caused heavy precipitation was analyzed by both synoptic analysis and dynamic methods. The results show that 500 hPa horizontal distribution of z\|helicity can give good direction to the movement of vortex center and distribution of rainfall, the heavy precipitation is located in the great grads ofpositivehelicity. z-helicity can reflect the dynamic character of weather when the rainstorm occurred, and divergence of negative vorticity on higher levelmatched convergence of positive vorticityon lower leve1 is a dynamic mechanism to trigger heavy precipitation. Relative spiral of more comprehensively reflect the rainfall districts and rainfall distribution center, and the next 6 h after the precipitation to the districts and have a better prediction of heavy precipitation occurred in a relatively central spiral of plus and minus centres connect the maximum gradient value of the positive side.Low level convergence of non-geostrophic wet Q-vector as a powerful tool to diagnose precipitation qualitatively has good relation to rain falls, convergence center are correlation with precipitation intensity; cross-section of wet Q-vector divergence provided good reference information for the distribution and movement of precipitation.

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Plateau vortex / Diagnostic analysis / Helicity / Non-geostrophic wet

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. A Case Study of Plateau Vortex Moving East Ward with HeavyRainfalls Based on Helicity and Non\|Geostrophic Wet Q-Vector. Plateau Meteorology. 2009, 28(2): 319-326

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