【摘要】 本文是应用100 hPa北半球高度场格点资料,选取2003—2005年6—7月南亚高压季节性东进、北移的15个过程,其中包括这3年中在入、出梅期间500 hPa副热带高压有响应的季节性北移个例。计算了40°N的波谱物理量—1~7波的方差比和波能密度,分析其西风带长波—超长波的调整和南亚高压的东进、北移的相关,并从波能密度的演变特征来识别何种长波波动对南亚高压的季节性变化具有最大的贡献。从而得出100 hPa 40°N的超长波的调整是南亚高压季节性东进、北移的环流背景,而西风带4~6波的长波槽波能密度的激增是诱发南亚高压季节性演变的最大贡献者。更多还原

【Abstract】 In this paper,applying altitude field grid data of North Hemisphere at 100hPa,choosing 15 processes of south Asia high seasonal eastward and northward advances in June and July from 2003 to 2005,including example that subtropical high at 500 hPa had seasonal northward advance responding in entering and outing plum rain,the wave spectrum physics on 40 °N,the variance ratio of 1~7 waves and wave energy density are calculated.On the basis of this calculation,the responding relations between adjustment of long wave-extra-long wave within westerly belt and south Asia high eastward and northward advances are analyzed in order to recognize what kind of the long wave that made the most contribution to seasonal movement of south Asia high from the development feature of wave energy density.These analysis shows that the adjustment of extra-long wave on 40 °N at 100 hPa is the circumfluence background of south Asia high eastward and northward advances,the wave energy density increment of long wave groove from 4 to 6 waves within westerly belt made prominent contribution to seasonal development of south Asia high.更多还原