低涡

西南低涡Ekman层流场特征分析

The characteristic analysis of Ekman layer 's streamline fields of Southwest Vortex

本文利用大气边界层模式，对1979年7月24&25日的一次西南低涡暴雨进行了Ekman层的流场分析。

In this paper , Ekman layer s streamline fields of a Southwest Vortex from 24 to 25 July 1979 are analysised by using a atmosphere boundary layer model .

τp/τk≈1.0的颗粒的浓度场显示，由于局部富集效应颗粒倾向于集中在低涡度高剪切的区域。

The concentration field of the particles with τ _p / τ _k ≈ 1.0 showed that particles tended to be collected in regions of low vorticity ( high strain ) due to preferential concentration .

1998年7月20～23日（简称98.7）发生在武汉周边地区的特大暴雨过程与沿低涡切变线相继生成和强烈发展的MαCS及MβCS直接关联。

During the period of 20 ~ 23 July 1998 (" 98.7 " ), an extraordinary heavy rainstorm event occurred in Wuhan surrounding which was direct relationship with the successive generating and intensive developing M α CSand M β CS .

利用非静力中尺度模式系统（ARPS），对1998年7月20日至22日期间长江流域的低涡切变线及暴雨过程进行了模拟。

The low-level vortex and shear line and the accompanying severe heavy precipitation in July 1998 are successfully simulated by using non-hydrostatic mesoscale model system ( ARPS ) .

结果表明：高、低空急流耦合区中西南低涡及MCC特征云团的形成和维持是造成此次特大暴雨的直接影响系统。

The results show that the event is directly affected by the formation and evolution of southwest vortex and MCC cloud cluster which locate in the intersection region of the upper-level jet and the low-level jet .

同化AMSU资料使温度场和风场增强，更清楚的显示出中尺度低涡系统发生和演变的过程。

AMSU data increased the quantity of temperature and wind , could clearly revealed the occurrence and change of the low vortex which lead to the rainfall .

同时，利用中尺度有限区域模式MM5V2对该东风波诱生中尺度低涡进行模拟。

Meanwhile , the mesoscale area-limited model MM5V2 is used to simulate the mesoscale low vortex induced by the easterly wave .

MαCS发生在低层切变线南侧的中尺度辐合线（或辐合中心）上，并在减弱阶段演变为明显的低涡结构；

The M α CS occurred over the mesoscale convergence line ( or convergence center ) located south of a shear line in the lower-level jet ( LLJ ) field during its occurrence and development and became a clear low vortex during its weakening and dissipative stage .

结果表明：该次大范围风雹强对流天气系统是在东北低涡下，高空前倾槽与地面辐合线有利的大环流背景下，一个中尺度对流系统MCS影响所致。

The result of the study indicated that this large area wind-hail strong convection weather system was aroused by one MCS and controlled by the northeast low vorticity . It was in advantaged large circumfluence background of upper-air pitch trough along with surface convergence line .

结果表明，MCC发生在较弱的斜压环境里，对流层低层有明显的天气系统如切变线、中尺度低涡，中层可以没有低压槽参与，高层则出现在反气旋环流里。

Results demonstrate that the MCC develops in a weak baroclinic environment , a 850 hPa horizontal wind shear line with a vortex dominated in the low levels and an anticyclone in upper levels , without baroclinic wave trough accompanying in midlevels .

500hPa层持续的高空正涡度平流以及700hPa低层暖平流非常有利于低涡的维持；

The maintain positive vorticity advection in the middle troposphere and the warm advection in the lower troposphere take advantage of the vortex development and maintain ;

采用Barnes带通滤波方法分离出中尺度天气系统表明，500hPa上的中尺度低压扰动系统和700hPa上的中尺度低涡是产生这次暴雨天气过程的直接的天气系统。

The analysis of mesoscale system shows that disturbing mesoscale low pressure system at 500 hPa and mesoscale vortex at 700 hPa are directly influential systems which caused the heavy rain process .

模式还揭示了850hPa中-β尺度低涡和水汽输送对雨核起到关键性作用。

The simulated results also reveal the key impacts of the meso β low vortex at 850 hPa and the vapor transportation on the rain cores .

结果表明，高原低涡东移到100°E附近时，其低涡东部的正涡度平流与负值非平衡强迫与850hPa四川盆地浅薄低涡发生垂直叠加时，两者之间发生耦合作用。

The results show that , when the Plateau vortex moving eastward near 100 ° E , the positive vorticity advection and the negative unbalanced force in the east part of the Plateau vortex on 500 hPa imposed on 850 hPa southwest vortex occurred the vertical superposition .

导致本次过程降雪产生的主要影响系统是地面倒槽和700hPa中α尺度低涡，其影响时间相对持久。

The main effect system of causing snowstorm process is surface inverse trough and 700 hPa meso - α - scale low vortex , and its impact time is relative to the lasting .

冷暖空气的激烈交锋、梅雨锋上的中尺度辐合线、700hPa、850hPa上的低涡、切变线以及稳定维持的高低空急流是导致这场暴雨的直接影响系统；

The strong conflict of warm and cold mass , mesoscale convergence on Meiyu front , shear line , and stably maintaining of high and low jets make for the rainfall .

“98.7”特大暴雨过程与700hPa低涡切变线的强烈发展以及丰沛的水汽和强垂直运动密切相关。

The " 98.7 " extraordinary heavy rainfall event was in close relationship with the intensive development of a low vortex with shear line on 700 hPa and the abundant moisture as well as strong vertical motion .

双向嵌套的细网格模拟结果揭示，武汉周边地区的特大暴雨与700hPa上一个β中尺度低涡的生成和强烈发展直接关联。

The simulated results using two-way interactive fine grid reveal that . the extraordinarily heavy rainfall in the Wuhan periphery was in direct relationship with the genesis and intensive development of a meso - β scale low vortex at 700 hPa ;

该过程与500hPa短波槽和700hPa低涡切变线以及沿切变线相继生成和强烈发展的β中尺度对流系统密切相关。

Analyses indicate this event was in close relationship with the short wave trough at 500 hPa and low vortex with shear line at 700 hPa as well as with successive generating and intensive developing of M β CS along the shear line .

研究结果表明，暴雨天气是在有利的东高西低降水形势下产生的，其主要的触发天气系统是500hPa冷槽、700hPa高原低涡及地面锢囚锋。

The results show that the rainstorm weather was generated under the favorable " high east and low west " rainfall situation . The main triggering weather system is the 500 hPa cold trough , 700 hPa plateau low vortex and ground occluded front .

在此基础上分析了生成低涡的500hPa环流背景和九龙涡生成的地理环境，试图揭示西南涡生成的机理，最后，文章利用非热成风适应原理，对低涡生成机理进行了理论分析。

In this paper the circulation on 500 hPa and geographic environment about Vortex source , and endeavor to reveal the generative mechanism of the Southwest China Vortex are analysed . Here it is discussed theoretically in the non-thermal wind adjustement principle of nonadiabatic and topographic effect .

哈密地区东部一次低涡天气分析

The Analysis of a Low Vortex in the East Hami Area

暖性西南低涡生成的一种可能机制

A potential mechanism of the warm vortex genesis in Southwest China

一次华北低涡造成的强对流天气分析

Analysis of strong convection caused by low eddies from North China

行星边界层内低涡的环流结构

The circulation structure of the vortex within the planet boundary layer

一类低涡孤立波解的特征分析

Characteristic analyses of solitary wave solution to a type of vortex

影响05.06.25长江流域暴雨的西南低涡特征

Characteristics of Southwest Vortex of Influencing " 05.06.25 " Yangtze River Rainstorm

西南低涡暴雨的中尺度特征

The meso - scale characteristics of SW vortex heavy rainfall

造成山东不同天气的两个西南低涡异同分析

Comparative Analysis of Two Southwest Low vortices Causing Different Weather in Shandong