Meteorological Drought Characteristics Research of Western Jilin Province Based on Wavelet Analyses

Abstract:

Drought is a recurrent feature of the climate. It occurs in virtually all climatic zones, and its characteristics vary significantly among regions. 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. SPI not only nicely reflects drought intensity and duration, but also has a multi-temporal scale application dimension. For the purpose of analyzing multiple meteorological drought time-scales, Morlet wavelet transforms of the station monthly SPI time-series are interpreted. The results show that some stations, such as Chang-Ling and Tong-Yu, have remarkably significant cycles in their respective wavelet power spectrum and variance. However, these significant cycles are not clearly noticeable in the other stations. Irrespective of the trend, time-scale and cycles generally influence drought characteristics in the study area.

• Periodical: Applied Mechanics and Materials (Volumes 295-298)
• Pages: 2121-2126
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.295-298.2121
• Online since: February 2013
• Authors: Wen Xi Lu, She Ming Chen, Jian Nan Luo
• Keywords: Meteorological Drought Characteristics, Morlet Wavelet Analysis, Standardized Precipitation Index, Western Jilin Province

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