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利用1789-1992年南海北部逐年珊瑚灰度与1908-1992年广州逐年降水资料,采用Mann-Kendall法、奇异谱分析、相关分析、合成分析等方法对南海北部年珊瑚灰度的年代际变化进行了分析,并探讨了用珊瑚灰度重建的广州降水时间序列所反映的华南降水的年代际变化特征．结果表明:南海北部珊瑚灰度变化存在明显的趋势项、权重很大的年代际变化和较弱的年际变化．1880年代末存在显著的由正异常到负异常转变的世纪尺度突变,突变前后对应的全球海温差值场是:南海及其附近的北印度洋、中西太平洋大部、北大西洋沿岸为负异常,这种大范围的海温异常分布是与南海珊瑚灰度世纪尺度突变相伴随的．南海珊瑚灰度与广州降水在年代际尺度上存在显著的负相关。用年代际尺度南海珊瑚灰度资料反演的广州年代际降水表明了华南降水年代际变化具有明显的阶段性．对寻找研究华南年代际以上尺度气候变化的代用指标有一定的意义．
Based on the annual coral grayscale in the northern South China Sea from 1789 to 1992 and annual precipitation data in Guangzhou from 1908 to 1992, the interdecadal variation of the annual coral grayscale in the northern South China Sea was calculated using Mann-Kendall method, singular spectrum analysis, correlation analysis and synthetic analysis Analyzes the interdecadal variation characteristics of the precipitation in South China reflected by the gray-scale reconstructed Guangzhou precipitation time series. The results show that there are obvious trend items, great decadal decadal variations and weaker interannual variations in the coral grayscale in the northern South China Sea. At the end of the 1880s, there were notable century-scale abrupt changes from positive anomalies to negative anomalies. The global SST differences before and after the abrupt change were: the North Indian Ocean over the South China Sea and its vicinity, most of the Western and Central Pacific Ocean, and the North Atlantic coast negatively anomalous The wide range of SST anomalies is accompanied by a century-scale mutation in the gray scale of coral in the South China Sea. There is a significant negative correlation between coral gray in the South China Sea and precipitation in Guangzhou on the interdecadal scale. The interdecadal precipitation in Guangzhou retrieved from the coral scale data of the South China Sea on a decadal scale shows that the interdecadal variation of precipitation in South China has obvious stages. It is of certain significance to search for the proxy index of climate change in the South China over the decadal scale.