Severe convergence brought by Low-level jet pulsation, and severe divergence brought by upper-level jet is directly trigger mechanism of this intense rainstorm.
低层低空急流脉动产生的强辐合，高空急流诱发的高层强辐散是本次东北地区暴雨天气的直接触发机制。
The upper-level jet created the dynamic instability condition and the low-level jet played the vapour provider of the snowstorm and the trigger of convective instability energy release.
高空急流提供动力不稳定条件，低空急流是暴雪区水汽的提供者和对流不稳定能量释放的触发者；
The evolution and enhancement of occluded frontal circulation in upper-level westerly jet and lower-level southerly jet are discussed by using a dry primitive equation model.
利用原始方程模式探讨了高空西风急流和低空南风急流中锢囚锋环流的演变和增强机制。
Sountherly lower level jet of exit region on the south side of upper level jet enhances the inflow intensity of storm which provide the plenty of vapor for the convective systems.
高空急流出口区南侧的偏南风低空急流加强了风暴的入流强度，为风暴提供了有利的风场环境和水汽条件。
The low level shear system, which is composed of the southward downdraft branch of upper level northern jet and the ascend branch of low level jet, is the main synoptic system.
结果表明：向南运动的高层偏北风急流下沉支与低空急流上升支组成低涡切变系统是主要影响天气系统；水汽主要来源于孟加拉湾和南海，但东部海区水汽输送也不可忽视。
The low level shear system, which is composed of the southward downdraft branch of upper level northern jet and the ascend branch of low level jet, is the main synoptic system.
结果表明：向南运动的高层偏北风急流下沉支与低空急流上升支组成低涡切变系统是主要影响天气系统；水汽主要来源于孟加拉湾和南海，但东部海区水汽输送也不可忽视。
应用推荐