Application of wavelet method on analysis of precipitation characteristics in dry-cold areas,Inner Mongolia,China
Zou Cunjing · Ganhanqu ziyuan yu huanjing · 2012
The study focused on the precipitation time series of past long years in dry-cold areas,Inner Mongolia,China,which is one of important factors influencing on wind erosion,vegetations,agricultural development.The MHF wavelet method was adopted to analyze the temporal-frequency multi-time scale variations and jump features of dust storm activities,which can reveal the multi-scale characteristics of dust storm.Consequently,the periods and turning points of precipitation in different time-scale were revealed.Meanwhile,the trend of rainfall in the following years was forecasted.The results showed that the precipitation showed obvious staggered features in dry-cold areas,Inner Mongolia,China.It was also found that approximate 1-year and 9-year period-oscillation was the strongest.In final the wavelet coefficients patterns exhibited a probablely decreasing trend in the following years.