南京信息工程大学学报Issue(1)：58-67,10.
青藏高原春季500 hPa纬向风季节内振荡特征及其与我国南方降水的关系
Oscillation characteristics of 500 hPa zonal winds over the Tibetan Plateau in spring and its association with precipitation in south China
摘要
Abstract
Using the wavelet power spectrum and composite analysis,the intraseasonal oscillation of 500 hPa zonal winds in spring over the Tibetan Plateau and its relationship to the precipitation in south China is studied,based on the daily NCEP/NCAR reanalysis and the daily precipitation dataset from 753 stations in China.Results reveal that the 10⁃30 d oscillation is the dominate period of the 500 hPa zonal wind variations over the Tibetan Plateau in spring season,characterized by its eastward propagation in zonal and southward propagation in meridional direction. Results also indicate that this 10⁃30 d intraseasonal oscillation is closely related to the spring precipitation over the south China.As the low⁃frequency oscillation over the Tibetan Plateau reaches its peak phase (phase 2⁃3,i.e.,west⁃erly anomalies over the plateau),there will be positive precipitation anomalies in south China,and vice versa.In ad⁃dition,the occurrence of the maximum ( minimum) precipitation anomalies over south China is about 2 days lagged behind the peak ( valley) phase of the intraseasonal oscillation over the plateau. Results further show that the in⁃traseasonal oscillations of 500 hPa zonal wind over the Tibetan Plateau is highly related to an eastward⁃propagating wave train in the mid⁃high latitudes and through which the oscillation thus affects spring precipitation over south China.关键词
青藏高原/纬向风/振荡/降水Key words
Tibetan Plateau/zonal wind/oscillation/spring precipitation分类
天文与地球科学引用本文复制引用
杨严,徐海明..青藏高原春季500 hPa纬向风季节内振荡特征及其与我国南方降水的关系[J].南京信息工程大学学报,2015,(1):58-67,10.基金项目
公益性行业（气象）科研专项（ GYHY201006020）；国家自然科学基金（41275094）；江苏高校优势学科建设工程（ PAPD）项目；江苏省高校“青蓝工程”项目 （）
