近50年来湛江、韶关气候变化的小波分析

Wavelet Analysis on Temperature and Precipitation in Zhanjiang and Shaoguan

利用MHAT小波函数分析了湛江和韶关两地近50年平均气温和年降水量多时间尺度的演变特征,并对其气候突变进行了初步分析。结果表明,湛江气温变化包含了16年、4年和2年的振荡周期,其降水具有11年、4年的周期变化特征;而韶关的温度序列只具有5年、3年的高频振荡周期,降水变化则包含了11年、7年、4.5年的周期振荡。经气候突变的分析检验,湛江、韶关的气温及降水在不同时间尺度下具有不同的突变点。

By using Mexican - Hat wavelet transformation, multi - temporal - scale variations of mean temperature and annual precipitation in the past 50 years （1951 -2000） in Zhanjiang and Shaoguan are discussed, as well as the abrupt change points of climate are identified. Results show that the temperature has 16, 4, and 2 -year oscillations in Zhanjiang, but only 5 and 3 -year oscillations in Shaoguan. As for annual precipitation, 11 and 4 -year oscillations arc found in Zhanjiang while 11, 7 and quasi -4.5 -year oscillations are identified in Shaoguan respectively. Study also shows that the abrupt change points of climate are related to the multi - temporal - scale variations.