1) low-level Jet
低空急流
1.
Analysis of The Low-level Jet(LLJ) Effect on Typhoon Torrential Rain in Guangxi and The Conceptual Model;
低空急流对广西热带气旋特大暴雨的影响及概念模式
2.
The results show that the heavy rainfall,which had two main rain belts and significant daily variations,was mainly associated with the active 500 hPa trough,850 hPa shear line,low-level jet and cross-equatorial flows.
结果发现,暴雨的空间分布有着双雨带特征,即南北两条雨带,北面雨带对应着切变线,南面的雨带对应着低空急流;暴雨开始前及暴雨过程中,索马里附近一直维持强盛的越赤道气流,同时在100°~160°E之间也有越赤道气流活动并有西进现象;500hPa西风槽、850hPa切变线是这次过程开始和维持的重要系统;华南上空对流层高层东风的建立是这次过程结束时重要特征;南海北部至广东上空低空急流中心风速的周期性脉动与广东强降水的日变化现象有着很好的对应关系。
3.
The relationships between the large scale circulation characteristics,low-level jet and warm heavy snow in Aletai distract were analyzed.
分析了冬季产生新疆低空急流的大型环流特征及低空急流与阿勒泰暖区大-暴雪的关系。
2) Low level jet
低空急流
1.
The results show that the high potential vorticity,dry air from the upper level of troposphere extended downwards and southwards,which increased the vertical component of the vorticity on the steep iso-entropy plane and promoted the rapid development of the low level cyclone,resulted in a low level jet and the intensive convergence in .
结果表明:这次强沙尘暴天气有明显的干侵入特征,对流层中高层高位势涡度,干空气在西北气流引导下,沿等熵面入侵到边界层;干侵入使对流层低层产生高位涡扰动、锋面气旋环流加强、低空急流形成、边界层辐合增强,从而引发了这次强沙尘暴天气。
2.
The results show that unbalance force of atmospheric motion and the coupling reaction among convective cloud cluster and moisture frontal zone and low level jet lead to the continuation of strong c.
分析结果发现,大气运动非平衡强迫、凝结降水的非均匀分布与强烈垂直风切变的耦合作用、“湿度锋”与低空急流的耦合相互作用通过促进低空辐合流的维持,导致了对流云团和暴雨天气的持续。
3.
Based on the improved definition of the low level jets(LLJs) in China,the southwesterly low level strong winds are divided into low level jets that have vertical axes in low level and low level strong winds(LLSWs) that have no wind axes, and the differences of the climatic and synoptic characteristics between them are discussed.
通过从垂直切变角度对中国低空急流的定义,表明西南低层大风现象有两类:有垂直轴的低空急流和无垂直轴的西南低层大风(简称低层大风),并揭示了二者的气候学和天气学特征差异。
3) low jet
低空急流
1.
The cloud cluster self\|exciting process caused by the coupling reaction between strong vertical wind shear V/p and great vertical velocity gradient Δ ω is studied according to the non\|homogeneous distribution of wind field near the low jet and strong vertical velocity variation in the edge of cloud cluster.
依据低空急流附近风场分布的非均匀特征,结合对流云团边缘附近呈现的强烈垂直速度梯度分布,利用动力学诊断分析,研究了急流低层强烈垂直风切变与对流云团后部强烈垂直速度梯度耦合相互作用产生的对流自激励过程,揭示了低空急流附近新对流和强降水在云团后部发生、发展的可能机制。
2.
The results indicated that the low vortex was a prominent baroclinic system,and there was keeping the strong southwest low jet in the southeast position of the moving low vortex .
结果指出:25日移出川东影响长江中游的西南低涡是一个显著不对称的斜压系统,其过程中始终伴随着强盛的西南低空急流;低涡过程中非地转平衡性很强,高层正涡度平流和低层暖平流的共同作用,是低涡移动过程中周围大气维持较大非热成风涡度,从而造成低涡区域上空强上升运动的重要原因。
5) middle and lower tropospheric jet
中低空急流
1.
The observation and research indicate that the primary dynamic condition of this severe convective weather is the eruption of the middle and lower tropospheric jet and the propagation of the gale center.
根据国家气象局资料中心提供的历史探空资料分析了华南和华东地区的一次强对流天气的生命史过程,观测研究表明:中低空急流的爆发和急流内大风中心的传播是这次强对流天气主要的动力学条件。
6) extra low-altitude jet flow
超低空急流
1.
The result shows that extra low-altitude jet flow is the main cause of instability energy and water vapour except for the favorable large scale circulation.
通过对冀东南、鲁西北一次区域性大暴雨的分析表明 :除有利的大尺度环流背景以外 ,超低空急流是大暴雨不稳定能量和水汽的主要输送者 ,高能区不稳定能量释放 ,产生大暴雨所需的强烈上升运动。
补充资料：低空急流
| 低空急流 low-level jet 在对流层下部距地面1000～4000米的强风带。中心风速一般大于12米／秒，最大可达40米／秒。低空急流的流程长短不一，长的可达数千千米，短的仅有数百千米，北半球的低空急流一般为偏南或西南气流，出现在副热带高压的西侧或北侧边缘。当有台风在副热带高压西南侧发生和发展时 ，也可出现东南向的低空急流。低空急流的风速，有明显的超地转特征，即实际风速大于地转风速，在强风速中心附近往往超过一倍以上。低空急流区域水平温度分布比较均匀。低空急流的左侧为主要上升运动区，右侧为下沉运动区。低空急流同暴雨、冰雹、龙卷等强对流天气有密切关系。 |
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参考词条