Structural Features and Numerical Simulation of a Thermodynamic Thunderstorm in Lhasa

WANG Tianyi;ZHU Keyun;ZHANG Jie;ZHOU Yunjun

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Plateau Meteorology ›› 2015, Vol. 34 ›› Issue (5) : 1237-1248. DOI: 10.7522/j.issn.1000-0534.2014.00054

Structural Features and Numerical Simulation of a Thermodynamic Thunderstorm in Lhasa

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Abstract

The numerical simulation and the structural features of a thermodynamic thunderstorm over Lhasa were studied by using the three dimensional hailstorm numerical model.The results indicate that: the occurring, aging and weakening features of the thermodynamic thunderstorm over the Lhasa area were successfully presented by this model.The updraft was relatively weak when the thermodynamic thunderstorm was just happened.The total water vapor mixing ratio reached maximum as well as the ascending velocity in the mature stage, and then it reached the extinction phase when the thermodynamic thunderstorm cells declined later.Crystal ice particles were of the highest production and of the majority among hydrometeors (ice, snow, graupel and hail particles), but the graupel particles dominated at the primary stage of the thermodynamic thunderstorm.The water vapor within the thermodynamic thunderstorm was little and appeared after the daily maximum temperature, which is the unique feature of the thermodynamic thunderstorm over the plateau.The vector wind showed a convergence in the low-level and divergence in the upper level.Instable energy is relatively small and thermal perturbation in the afternoon is the main trigger of the thermodynamic thunderstorm.The CAPE value of this thunderstorm is 186.6 J·kg-1, which is potentially instable.But because of the strong radiation in Tibet, after noon, it can turn into convective instable leading to strong convection.There is less water vapor in the thunderstorm in Tibet, which is different from the thunderstorm over plain.

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Thermodynamic thunde / Structural feature / Numerical simulation / Lhasa

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WANG Tianyi , ZHU Keyun , ZHANG Jie , ZHOU Yunjun. Structural Features and Numerical Simulation of a Thermodynamic Thunderstorm in Lhasa. Plateau Meteorology. 2015, 34(5): 1237-1248 https://doi.org/10.7522/j.issn.1000-0534.2014.00054

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