摘要
通过对1951～2000年西太平洋副高4个特征指数的分析发现,年际尺度上西太平洋副高面积和强度指数有3.5年周期,北界指数有2.6年和5年周期,这和华南降水及其异常变化趋势一致,说明西太平洋副高是影响华南降水最主要因素之一。物理量诊断分析表明,西太平洋副高主要是通过500hPa涡度和850hPa散度和水气通量散度的显著变化来影响华南降水异常分布的。
Analysis of four characteristic indexes of subtropical high in west Pacific showed that the area and intensity indexes of west Pacific subtropical high had a period of 3.5 years and its north boundary index had a period of 2.6 years or 5 years, which were consistent to extremely change tendency of Huanan rainfall. The results also showed subtropical high in west Pacific is one of the most primary factors affect Huanan rainfall. Analysis of physical variables results indicated that subtropical high cause the anomaly distribution of Huanan rainfall by the remarkable variation of vorticity at 500 hPa, divergence and moisture flux divergence at 850 hPa.
出处
《安徽农业科学》
CAS
北大核心
2009年第30期14790-14793,共4页
Journal of Anhui Agricultural Sciences
关键词
西太平洋副高
华南旱涝
演变特征
Subtropical high in west Pacific
Drought and flood in Huanan
Variation characters
