Structural Characteristics of Physical Quantity Turbulence Fields for a Severe Convective Weather Event
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Abstract:
A severe convective weather event occurred on 4 April 2007 is analyzed. Due to the persistent warming in previous days, a great deal of unstable energy was accumulated and vertical wind shear，dynamic，thermodynamic, and vapor conditions were all favorable to the formation of severe convective weather. The turbulence of temperature, humidity and kinetic energy on the ground and in upper air are analyzed. The results show that there was positive temperature turbulence before and during the convective weather and negative turbulence after. At the same time，the temperature turbulence on the ground was obviously bigger than that at upper levels, which means that the thermodynamic effect on the ground was larger than that in upper air； the humidity turbulence in the area of severe convective weather was smaller than that of the surrounding areas, which was likely one of reasons for thunderstorm and gale occurrence. The humidity turbulence at various levels was relatively great and the convection was strong consequently.The kinetic energy turbulence in the storm area was distinctly bigger during the storm than that before and afer. The kinetic energy turbulence on 850 hPa was the biggest and that on the ground was the second.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.