QBO and Its Influence on the General Atmospheric Circulation and the Climate in East Asia
Li Chongyin Long Zhenxia(LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing , 100080)
In this paper, the evolution properties of the stratospheric QBO and its influence on the general atmospheric circulation and the climate in East Asia/the western Pacific are studied by analyzing data of many years. Results show that the transition from the easterly to the westerly originates in the equatorial Indian Ocean, and from the westerly to the easterly in tropical America and the equatorial western Pacific. There are quasi-biennial variations in the precipitation, the temperature in East China/the subtropical high over the western Pacific and the Jet in East Asia. They are closely related to the stratospheric QBO. The stratospheric QBO also affects the typhoon activity over the western Pacific. The number of the typhoon over the western Pacific is smaller during the period of the QBO's westerly phase. In addition, ENSO obviously affects the stratospheric QBO. Generally, after ENSO's occurrence, the continued length of the QBO's westerly phase is shortened.