PROGRESS IN GEOGRAPHY ›› 2010, Vol. 29 ›› Issue (11): 1340-1344.doi: 10.11820/dlkxjz.2010.11.016

• Original Articles • Previous Articles     Next Articles

A Wavelet Analysis on Annual Rainfall Variation in Hebei Province during 1965-2005

LI Chunqiang1, DU Yiguang1,2, LI Baoguo2   

  1. 1. Hebei Provincial Key Lab for Meteorology and Eco-environment, Meteorological Institute of Hebei Province, Shijiazhuang050021, China;

    2. College of Resources and Environment, China Agricultural University, Beijing 100094, China
  • Received:2009-07-01 Revised:2010-01-01 Online:2010-11-25 Published:2010-11-25


Rainfall temporal-spatial variations are very important for the development of agriculture production and social-economy. Based on the precipitation data of 85 surface weather stations in Hebei province from 1965 to 2005, the annual rainfall change characteristics under different time scales were analyzed by the Morlet wavelet analysis method. The results showed that three periodic oscillations (18-year, 8-year and 4-year) existed in the annual rainfall variation, and 18-year scale mainly in the 41-year period, but 8-year in the 1990s and 4-year in the 1970s. Also, there were 5 dry-wet processes for the 18-year scale and 10 dry-wet processes for the 8-year scale. A clear distinction for multi-time scales characteristics of annual rainfall occurred in different spatial areas. The large-scale of 12-18 years and meso-scale of 8-12 years were revealed in the northern and central-eastern parts respectively, while a small-scale of 3-8 year period was found in the western part of Hebei province.

Key words: Hebei province, morlet, rainfall variation, wavelet analysis