基于均一化资料的广州近百年气温变化特征研究

RHtest software and station metadata were used to detect and adjust artificial shifts of the annual average temperature of Guangzhou during 1908-2019. The results showed that there were seven significant abrupt change points in 1912, 1928, 1942, 1988, 1995, 2004 and 2010. The temperature increasing rate was 1.39℃/(100 a), which was higher than the series without homogenization adjustment, with significant quasi-50-year and quasi-3-year periods. DB16 orthogonal wavelet was applied to analyze the multiple time scale changing characteristics. The trend component had the largest variance contribution, followed by quasi-3-year and quasi-6-year periodic components. The trend component began to show a continuous warming trend from the 1940s. The rapid warming from the middle 1980s to the end of the 20th century was the result of superposition of the rising phase of the quasi-50-year period component, quasi-20-year period component and the trend component. The warming hiatus from 1998 to 2014 was caused by the superposition of the cooling phase of the quasi-50-year period component, quasi-20-year period component and the quasi-10-year period component.

Keywords： Homogenization; Centennial air temperature; Multiple time scales; Guangzhou