【摘要】 本文研究了200 hPa面纬向风的准40天和准15天振荡同南亚高压的南北伴移以及东西振荡的关系.南亚高压的南北位移主要同准40天周期相对应,而准15天周期主要同东西振荡相联系。根据两种周期在一定地区低频u分量的位相变换,可以为预报南亚高压的变动提供中、长期预报线索。更多还原

【Abstract】 In this paper, the relations between the quasi-40 day and quasi-15 day oscillations of zonal winds on 200 hPa and the intraseasonal movements as well as the medium-range south-north and eastwest oscillations of the South Asian High are discussed. These two types of oscillation have the similar geographical distributions. The intraseasonal variation of the South Asian High is mainly correlated to the quasi-40 day oscillation and the quasi-15 day oscillation is mainly related to its east-west movement.It provides a clue for the long- and medium-range forecast of the variations of the South Asian High according to the phase transitions of the two oscillations of ucomponent on 200 hPa in typical regions.更多还原