Considering the non-uniform saturation of the real atmosphere,a diagnostic study of a torrential rain event is performed from the perspective of the anomaly of the generalized moist potential vorticity（GMPV） after i...Considering the non-uniform saturation of the real atmosphere,a diagnostic study of a torrential rain event is performed from the perspective of the anomaly of the generalized moist potential vorticity（GMPV） after introducing the generalized potential temperature into the thermodynamic frame of the real atmosphere. The results show that the anomaly appeared at mid-lower levels of the troposphere when the torrential rain happened.Analysis of the magnitudes and locations of maximum values of the tendency of the GMPV indicates that the anomaly of the GMPV was closely related to the occurrence of torrential rain. Therefore,the GMPV could be used to forecast and diagnose the occurrence of torrential rain in operational application.展开更多
利用沿江苏南地面气象站监测资料以及NCEP/NCAR再分析资料,探讨了2013年2月18—19日一次罕见伴随雷暴的暴雪天气过程的成因机制。结果表明：700 h Pa强盛的暖湿气流与925h Pa显著的偏东风急流交汇,形成了＂暖盖＂与＂冷垫＂稳定叠置并...利用沿江苏南地面气象站监测资料以及NCEP/NCAR再分析资料,探讨了2013年2月18—19日一次罕见伴随雷暴的暴雪天气过程的成因机制。结果表明：700 h Pa强盛的暖湿气流与925h Pa显著的偏东风急流交汇,形成了＂暖盖＂与＂冷垫＂稳定叠置并持续维持的锋生机制,为此次暴雪的发生发展提供了成熟的动力热力条件,在淞附增长作用下,形成较强降雪。强降雪落区与假相当位温密集带有很好的对应关系。对饱和湿位涡的进一步诊断分析表明,此次伴随暴雪出现的雷暴是较典型的冷区＂高架雷暴＂,它出现在条件性对称不稳定的环境中。通过等熵分析揭示了雷暴的触发机制：暖湿气流沿着锋面从低层爬升到600~650 h Pa,与冷空气相遇触发了本次雷暴。展开更多
基金Supported by the Wuhan Institute of Heavy Rain(IHR2006K01)the China Meteorological Administration Special Research Project(GYHY200706020)
文摘Considering the non-uniform saturation of the real atmosphere,a diagnostic study of a torrential rain event is performed from the perspective of the anomaly of the generalized moist potential vorticity（GMPV） after introducing the generalized potential temperature into the thermodynamic frame of the real atmosphere. The results show that the anomaly appeared at mid-lower levels of the troposphere when the torrential rain happened.Analysis of the magnitudes and locations of maximum values of the tendency of the GMPV indicates that the anomaly of the GMPV was closely related to the occurrence of torrential rain. Therefore,the GMPV could be used to forecast and diagnose the occurrence of torrential rain in operational application.
文摘利用沿江苏南地面气象站监测资料以及NCEP/NCAR再分析资料,探讨了2013年2月18—19日一次罕见伴随雷暴的暴雪天气过程的成因机制。结果表明：700 h Pa强盛的暖湿气流与925h Pa显著的偏东风急流交汇,形成了＂暖盖＂与＂冷垫＂稳定叠置并持续维持的锋生机制,为此次暴雪的发生发展提供了成熟的动力热力条件,在淞附增长作用下,形成较强降雪。强降雪落区与假相当位温密集带有很好的对应关系。对饱和湿位涡的进一步诊断分析表明,此次伴随暴雪出现的雷暴是较典型的冷区＂高架雷暴＂,它出现在条件性对称不稳定的环境中。通过等熵分析揭示了雷暴的触发机制：暖湿气流沿着锋面从低层爬升到600~650 h Pa,与冷空气相遇触发了本次雷暴。
