Using Wavelet Analyses to Determine Drought Characteristics: A Cause Study of Western Jilin Province, China

She-Ming Chen ； Wen-Xi Lu ； He Wang ； Zhu Kang

《Research Journal of Applied Sciences, Engineering and Technology》 8卷5期 (2014/08) Pp. 578-584

並列摘要

Drought characteristics vary substantially among different climatic regions. Here in this study, wavelet analyses are used to characterize drought from monthly precipitation. The precipitation data are obtained from 6 fairly distributed stations across Western Jilin province (in China) for the period from 1957 to 2010. The calculated monthly Standardized Precipitation Index (SPI) is used as a drought index. Morlet wavelet analysis shows multiple time-scales and significant cycles of drought exist in the study area. The cross wavelet approach was applied to see if there was a connection between monthly SPI time series and large scale climate indices, such as NINO3. The result shows that drought occurrence in the region is mainly influenced by medium and long-time climatic factors. However, different factors have degrees of influence at different stations.

並列關鍵字

Drought characteristics ； multifractal analysis ； standardized precipitation index ； wavelet analysis ； western Jilin province