[Multiple time scale analysis of precipitation series in Changbai Mountain Region in 1959-2006].
Based on the 1959-2006 monthly and annual precipitation data from Songjiang, Donggang, Changbai, Helong, Linjiang, and Tianchi meteorological stations, and by using Morlet wavelet method, a multiple time scale analysis was made on the precipitation series from May to September (vegetation growth season), November to next April (snow season), and the annual in Changbai Mountain Region. The precipitation series was decomposed and low-frequency reconstructed at different levels by using the db5 wavelet of Daubechies wavelets, and the trend of the reconstructed series was identified and analyzed. In 1959-2006, there existed 3-6 years, 10-13 years, and 24-30 years cycles of precipitation series in vegetation growth season, 1-2 years, 5-7 years, and 17-20 years cycles in snow season, and 8-10 years, 16-20 years, and 25-30 years cycles in the annual, and the annual precipitation series showed an overall downward trend.
Hu
Nai-Fa
NF
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. hunaifa0919@163.com
Wang
An-Zhi
AZ
Guan
De-Xin
DX
Yuan
Feng-Hui
FH
Jin
Chang-Jie
CJ
Wu
Jia-Bing
JB
Wang
Ji-Jun
JJ
D002681:China; D017753:Ecosystem; D011891:Rain; D012621:Seasons; D013997:Time Factors; D014197:Trees / Q000254:growth & development*