| 1. | The weakest convective instability is at the occluded stages of cyclone
气旋锢囚期对流不稳定最弱。 |
| 2. | In the violent stages of development of cyclone , the convective instability becomes weak greatly
在气旋强烈发展期对流不稳定大大减弱。 |
| 3. | One of factors which activize the explosive development of cyclone exists strong convective instability in lower layers from the analysis of the barotropic potential vorticity
由正压位涡分析得出，气旋爆发性发展的启动因子之一为低层存在强对流性不稳定。 |
| 4. | In a word , convective instability strong baxoclinicity barotropic advection of potential vorticity and latent heat release are factors which activize this explosive development of cyclone
总之，对流不稳定、强斜压性和正压位涡平流、潜热释放是本次气旋发展的启动因子。 |
| 5. | By the analysis of the relationship among convective instability , symmetric instability and snowstorm , we found that the convective instability level is under 800hpa . snow belt is located in the negative value region of moist potential vorticity and verified the theory of symmetric instability
最后分析了这场暴雪中西北和东北地区的对流和对称稳定度，个例分析表明，暴雪产生在低层对流不稳定的情况下。 |
| 6. | The result indicates that , in the course of the rainstorm in huoshan , there are obvious low - level jet of great intensity , infection of mesoscale shear line , enhancement of plus vorticity which increases intensity of convergence , improves ascending velocity and brings on precipitation , and quick enhancement of helicity which provides the basis to forecast , in addition , convergence of moisture flux and analyzed potential vorticity which reflects baroclinic convective instability sufficiently indicate the characteristics of the rainstorm
结果表明：此次霍山暴雨发生前后，存在明显的大强度低空急流，并受到中尺度切变线的影响，而且正涡度的加强引起了辐合加剧，提高了上升速度从而引起降水，同时暴雨发生前螺旋度的迅速增强，也为预报提供了根据，另外水汽通量的辐合以及分析位涡反映出的斜压对流不稳定都充分体现了这次降水的特点。 |
| 7. | The analysis of meso - scale synoptic systems indicated that the occurrence and development of the local and paroxysmal meso - scale synoptic systems led to this rainfall besides the helpful macro - scale conditions . the evolution of the meso - systems depended mainly on the topography and the macro - scale conditions , among which the topography and convective instability were thought to be the most important
同时，在大尺度上升运动区中低层存在一个条件对称不稳定建立的机制，使得在暴雨区，既存在深厚的对流不稳定机制，又存在水汽输入机制和对流不稳定的触发机制，从而形成强暴雨。 |
| 8. | The analyses suggest that the first and second categories of rainstorms are associated commonly with the strong inertial instability in the upper troposphere , as well as respectively with symmetry and convective instabilities , and their rainfall is large ; and the third and fourth categories generally produce stable precipitation with a small rainfall , and their upper tropospheres are usually inertially stable
分析湿位涡与梅雨暴雨中的惯性不稳定、对称不稳定、对流不稳定的关系发现：第1类暴雨往往与对称不稳定有关，第2类暴雨与对流不稳定有关，且这两类暴雨高层多具有强惯性不稳定，降水相对较大；第3 、第4类暴雨是稳定性降雨，高层一般不具备惯性不稳定，雨量一般较小。 |
| 9. | The simulation results reveal that water vapor transportation northward is responsible for the generation of the convective instability in south shandong , and the easterly wind from sea , gravity wave and convergence generated by southward invasion of weak cold air in pbl play main role in trigger , transmission and enhancement of convective systems
定性地给出了中尺度对流系统气流运动的图像，即：在边界层，气流从东南方向斜升流入中对流区，在系统中垂直上升，约在7000米一9000米高空向东北方向流出，形成非闭合的垂直环流。 |
| 10. | The results show that there are two centers of occurrence of llsw respectively in dong bei and jiang nan ; the regional torrential rain over the yangtze river basin is closely associated with llsw during the major periods of heavy rainfall ; the diurnal variation of the number of occurrence in the middle and low reaches of the yangtze river is the strongest in china there are some significant differences between llj and nallsw in positive season , spatial variation , diurnal variation and field of pressure . by the way , the important effect of inertial stability on heavy rainfall with both low level south - westerly jet and high level northerly strong flow is analyzed theoretically . the results show that the existence of the maximum of inertial stability in the left font of the low level jet is favor of the accumulation of the moist thermal energy , and conditional symmetric instability or convective instability can be expected in this region
另外，惯性稳定性的作用以往不受重视，本文通过对西南低空急流左前方和高空偏北大风轴右后方的惯性稳定性和对称稳定性的理论分析和实例计算，表明惯性稳定性在伴有高低空急流的暴雨中有重要意义，揭示了梅雨暴雨的一种新的高低空急流耦合机制：低空急流左前方惯性稳定度大值区的存在，有利于低层湿热能量的积累，使低层倾斜对流的不稳定发展更多期望于条件性对称不稳定或对流不稳定；高空偏北大风轴(西风急流)的存在，是其右后方(右侧)出现对称不稳定的有利条件，高空相对容易出现干对称不稳定；惯性稳定性的作用，使低层的倾斜对流更偏向于垂直方向，有利于对流发展，使高层的倾斜对流更偏向于水平方向，有利于高层辐散。 |
