基于背景法对太行山中段焚风特征的分析

利用石家庄2009-2018年逐小时气象要素监测数据,设计了一种新的焚风统计方法--背景法,对太行山中段的焚风特征进行了分析,并探讨了其与常规焚风统计方法的差异及其命中率问题。结果表明:①背景法可以有效排除大尺度天气系统和辐射对焚风统计结果的影响,可以确保焚风过程统计的精准性;②与常规焚风统计方法相比,焚风日分布特征改善明显,表现为上午时段焚风次数明显减少、夜间明显增多,新方法的结论更加符合石家庄当地焚风特点;③石家庄地区基于背景法的焚风统计命中率为100%,但在其下游地区,随着与山脉距离增大,焚风统计命中率明显下降。

Analysis of Foehn Characteristics in Middle Section of Taihang Mountains Based on Background Method

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 large scale 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.