龙卷风超级单体风暴的次声产生
Infrasound generation by tornadic supercell storms
摘要：
本文研究了层结潮湿大气中由湍流产生的声波。结果表明，在饱和湿空气湍流中，除了与层结和温度起伏有关的Lighthill四极声源和偶极子声源外，还存在与水汽凝结过程中的热量和质量产生有关的声源。我们确定了这些声源的声功率。分析表明，强对流风暴的典型参数中，强对流辐射占主导地位。所得结果与观测到的强对流风暴次声辐射的总声功率和特征频率等主要特征定性一致。
英文摘要：
Acoustic wave generation by turbulence in the stratified, moist atmosphere is studied. It is shown that in the saturated moist air turbulence in addition to the Lighthill's quadrupole and the dipole sources of sound related to stratification and temperature fluctuations, there exist monopole sources related to heat and mass production during the condensation of moisture. We determine acoustic power of these monopole sources. Performed analysis shows that the monopole radiation is dominant for typical parameters of strong convective storms. Obtained results are in good qualitative agreement with the main observed characteristics of infrasound radiation by strong convective storms such as total acoustic power and characteristic frequency.
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