关键词: 关键词：气候变化, 气温, 降水, 统计分析

Abstract:

Based on the meteorological observation data from Wushaoling weather station of Gansu Province during 1951-2016, and the wavelet analysis method and other statistical methods were used to study the characteristics of regional climate change in Wushaoling under the background of global warming. The results show that air temperature in Wushaoling region presented rising trend with a rate of 0.20 ℃·(10 a)-1. The increasing range was maximum during 1997-2016, and in this period the average annual air temperature anomaly was 0.6 ℃, which was up to 0.8 ℃ in recent five years. The air temperature occurred an abrupt change in 1997. The linear trend of annual precipitation did not change obviously, and there were quasi-5 a, 13 a, 17 a, 43 a periodic changes. In the 1950s and the 1980s, the climate was humid, and in the 1960s and the 1970s, it was dry. In recent years, precipitation dispersion increased, and the frequency of heavy rainfall also increased, frost-free period extended, rain and snow days decreased, which all showed obvious climate warming. The db5 wavelet decomposition and R/S analysis showed that air temperature would continue to rise in the future, and precipitation would continue the current increase trend.

Key words: climate change, temperature, precipitation, statistical analysis