1977—2016年阳江地区对流层顶高度的变化特征

Characteristics of the Variation of the Tropopause Altitude of Yangjiang Region in 1977-2016

利用阳江探空站1977—2016年对流层顶资料,运用统计学方法对阳江地区对流层顶的出现频率与高度变化特征进行分析,揭示其基本事实和规律。结果表明:近40年来阳江地区第1对流层顶与复合对流层顶的出现频率极低,第2对流层顶占绝对主导地位,每月均可观测到第2对流层顶,秋、冬季出现频率比春、夏季高,08:00出现次数呈增多趋势,20:00出现次数则总体上无明显变化;近40年来阳江地区第2对流层顶高度年变化曲线呈两峰一谷型,春季最高、冬季次之,08:00秋季最低,20:00则夏季最低;08:00第2对流层顶高度总体变化趋势不明显,存在3、8~10、20~22年等尺度的主周期振荡,而20:00高度总体呈下降趋势,存在8、20~22年左右等尺度的主周期振荡。

Using the tropopause data for a radiosonde site in Yangjiang from 1977 to 2016 and with the statistical method, we studied the occurrence frequency and variation characteristics of the tropopause altitude of the Yangjiang region in an attempt to determine its basic facts and patterns. The result is shown as follows. Over the 40 years, the first tropopause and complex tropopause have extremely low frequency of occurrence while the second tropopause occurs at a dominating frequency so that it is observed every month. The frequency of occurrence is higher in autumn and winter than in spring and summer; it tends increase at 08：00 but remains generally unchanged at 20：00. The second tropopause altitude varies annually by a pattern of two peaks versus one valley, with primary oscillatory periods at 3, 8 to 10 and 20 to 22 years. On the other hand, it generally descends at 20：00, with primary oscillatory periods at 8, 20 to 22 years.