Analysis of Foehn Characteristics in Middle Section of Taihang Mountains Based on Background Method
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Abstract:
Based on the hourly monitoring data of meteorological elements in Shijiazhuang from 2009 to 2018, a new statistical method of foehns (background method) is designed. The characteristics of foehns in the middle Taihang Mountains are analyzed. The differences between the background method and the conventional foehn statistical method and its hit ratio are discussed. The results show that the background method effectively exclude the influence of largescale weather systems and radiation on the statistical results of foehns. It can ensure the accuracy of foehn process statistics. Compared with the conventional foehn statistical methods, the daily distribution characteristics of foehns are obviously improved and the number of foehn decreased significantly in the morning and increased significantly at night. The conclusion based on background method is more consistent with the characteristics of local foehns in Shijiazhuang. The statistical hit rate of foehns based on the background method is 100% in Shijiazhuang, but in the downstream area, the statistical hit rate of foehns decreased obviously with the increase of distance from the Taihang Mountains.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.