摘要
利用１９５８～１９９７ 年的 Ｎ Ｃ Ｅ Ｐ／ Ｎ Ｃ Ａ Ｒ 再分析资料，采用将大气环流在垂直方向分解为正压和斜压环流两个分量的方法，讨论了南亚高压季节演变中的正斜压环流的转换特征。指出（１）夏季，南亚高压以斜压性为主，其斜压分量约占 ７０ ％ 的比重，冬季以正压性为主，其正压分量约占 ７０ ％ 的比重；（２）由冬季的正压性高压向夏季的斜压性高压的季节演变中，南亚高压是在其斜压分量环流的引导下移动的，即其斜压分量环流的变化超前于其自身的变化；（３）由夏季的斜压性高压向冬季的正压性高压的季节演变则相反，南亚高压是在其正压分量环流的引导下移动的。
In the context of the 1958～1997 NCEP/NCAR reanalyses,the south Asian high (SAH) is vertically divided into two components,barotropic and baroclinic circulations,whereupon the conversion features are addressed of the SAH during its seasonal variation.Evidence suggests that 1)in summer (winter),the SAH is dominant by the baroclinic (barotropic) component accounting for approximately 70% of the total contribution; 2) as time progresses from winter to summer,accompanied by the barotropic SAH evolving into its baroclinic analog,the SAH moves under the guidance of its baroclinic component circulation,suggesting that the baroclinic component circulation precedes the system itself in variation; 3) the reversal happens when it goes from summer to winter,with the SAH displacement under the steering of its barotropic component circulation.
出处
《南京气象学院学报》
CSCD
1999年第3期291-299,共9页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金
关键词
南亚高压
季节变化
正压环流
斜压环流
大气环流
SAH (south Asian high)
seasonal evolution
barotropic circulation
baroclinic circulation
