Analysis of Periodic Characteristics of Meteorological Changes in He'nan in Different Dominant Qi Periods—Take Cumulative Precipitation as An Example
[Objective]To analyse the periodic characteristic of cumulative precipitation changes in He'nan in different dominant periods.[Methods]Based on the theory of Yunqi,using the method of wavelet analysis,the daily cumulative precipitation data of He'nan Province from January 21,1960 to January 19,2020,a total of 60 years,were used to analyze the periodic characteristics of cumulative precipitation changes in different dominant Qi periods.[Results]The cumulative precipitation of 1st Qi of the year in He'nan Province has a quasi-cycle of 5 years on the 8-year time scale.The cumulative precipitation of 2nd Qi of the year in He'nan Province has a quasi-cycle of 6 years on the 9-year time scale.The cumulative precipitation of 4th Qi of the year in He'nan Province has a quasi-cycle of 6 years on the 10-year time scale.The cumulative precipitation of 5th Qi of the year has a quasi-circle of 12 years on the 17-year time scale;The cumulative precipitation of 5th Qi of the year in He'nan Province has a quasi-cycle of 5 years on the 8-year time scale.The cumulative precipitation of end Qi of the year in He'nan Province has a quasi-cycle of 15～16 years on the 25-year time scale.[Conclusion]There are 5,6,12 or 15 years quasi-periods of cumulative precipitation in different dominant Qi periods in He'nan Province.The actual precipitation variation characteristics in the period of the 1st Qi and 4th Qi of the year are in good agreement with the theory of five evolutive phases and six climatic factors.
He'nan provincefive evolutive phases and six climatic factorhost climatic Qiwavelet analysisperiodiccumulated precipitation
NETL
NSTL
万方数据
