摘要
本文运用小波分析和功率谱分析方法对云南5月雨量的多尺度时间演变特征进行了分析,结果表明,云南5月雨量具有明显的年际和年代际变化特征。对与这两种时间尺度相关联的大气环流异常进行了分析,发现两者具有显著的差异。云南5月雨量的年际变化与冰岛低压、欧洲槽、南亚高压、中西太平洋ITCZ以及孟湾附近的低压系统的变化有着密切的关系,云南5月雨量的年代际-气候态变化与热带各系统的强度、乌山脊、阿留申低压关系密切。
Wavelet analysis and power spectrum method are used to analyze the multi-scale variation on precipitation in May in Yunnan. The results show that the variations of precipitation in May is characterized by both at interannual and interdecadal scales. Composition analysis shows that the physical mechanism of the interannual and interdecadial variation of precipitation in May in Yunnan are different, the former is closely related to Icelandic low, Eurasian trough, South Asia high, ITCZ in middle west Pacific Ocean and low system near Bay of Bengal; the latter is correlative to various tropic systems, Ural ridge and Aleutian low.
出处
《气象科学》
CSCD
北大核心
2007年第5期543-548,共6页
Journal of the Meteorological Sciences
基金
云南省重点基金项目(编号:2003D0014Z)资助
关键词
5月雨量
多尺度
大气环流
Precipitation in May Interannual and interdecadal variation Atmospheric circulation
