查询词典 squall

The result showed that the strong storm followed by mesoscale squall line was primary cause of strong sandstorm producing, steps and ladders short wave trough of 500 hPa was great criterion triggering system for the mesoscale squall line producing, the essential dynamic condition was provided by distortion field and the mesoscale low pressure of 700 hPa for the strong sandstorm forming and maintaining in mid-west of Hexi Corridor, the deep vertical circulation development condition was basic power that urged squall line to occur and sand dust to curl up, which was provided for the deep convection development by superimposition of lifting movement before ground cold front and ascendant current of secondary circulation in upper air jet entrance region, temperature and the barometric gradient around the cold front was enlarged by enhancement of ground thermal low and temperature diurnalvariation of afternoon, by which essential thermal energy unstable condition was provided for the gale and strong sandstorm eruption, the strong sandstorm appeared in downstream of -200 m^2s^(-2) center of vertical helicity, the vertical helicity had good instruction significance for development of squall line and landing region of sandstorm, the mesoscale squall line occurred in unstable stratification, basic condition of potential energy transforming as kinetic energy was provided by strong unstable stratification for the strong sandstorm forming and developing.

结果表明：中尺度飑线所伴随的强风暴是产生强沙尘暴的主要原因；500 hPa阶梯短波槽是中尺度飑线产生的大尺度触发系统，河西走廊中西部700 hp变形场、中尺度低压为强沙尘暴形成和维持提供了必要的动力条件；地面冷锋前上升运动与高空急流入口区次级环流的上升气流的叠加，为深对流发展提供了深厚的垂直环流发展条件，是促使飑线发生和沙尘卷起的基本动力；地面热低压的加强和午后气温的日变化加大了冷锋前后的温度和气压梯度，为大风、强沙尘暴爆发提供了必要的热力不稳定条件；强沙尘暴出现在垂直螺旋度为－200平方公尺/s^2中心的下游，垂直螺旋度对飑线的发展和沙尘暴的落区具有较好的指示意义；中尺度飑线发生在不稳定层结内，较强的不稳定层结为强沙尘暴形成、发展提供了位能转化为动能的基本条件。

The strong sandstorm was caused by squall line activity of eastern Hexi Corridor in Apr. to Jun. that was cold front, majority is in May, four times strong sandstorm is accompanied by the squall line in seven times. It was explained that the squall line was suggested easily when the strong cold front moved east to Hexi Corridor where special canyon tube terrain was in, the strong sandstorm which was created by squall line activity have very strong paroxysm that often created serious disaster.

河西走廊东部的飑线活动造成的强沙尘暴出现在4~6月，均为冷锋型，其中5月居多，出现的7次强沙尘暴中有4次伴有飑线，说明5月份强冷锋东移经河西走廊特殊峡管地形时易诱发飑线，飑线活动造成的强沙尘暴爆发性强，往往造成严重灾情。

The results indicate that the squall line systems are stronger with the increasing of water vapor in the lowest kilometer of atmosphere. The decreasing of water vapor in the height of 3 to 5 kilometer lead to a weaker development of squall line system. The decreasing of water vapor above 5 kilometer level has less impact on the development of the squall line system.

根据 Lin and Arakawa( 1997a，b )的研究指出，积云内部空气逸入源主要来自云顶发展高度以下的区域，且可能来自各种不同的环境高度，因此环境水气的垂直分布情形对积云结构的发展有重要影响。

The squall line, including surface wind and squall line structure, is simulated well by the WRF model.

3WRF模式对这次飑线过程的主要特征模拟较好，包括地面风场和飑线的结构。

Based on the new generation weather radar data in Guilin, a severe squall line event ahead of a front occurred in Guangxi on 5, May 2005 is analyzed to study the evolution of the squall and its convective cell.

利用位于桂林的新一代天气雷达资料对2005年5月5日影响广西桂林的锋前强飑线过程进行了详细的分析。

According to short term monitoring data, it appears that the new cell echo before the radar echo is advantage for the development and maintenance of the squall line. And the initialization of new cell is associated with boundary-layer convergence line. As a result, mesonet data is useful fur to research on squall line.

从短时监测的资料分析，飑线发展过程中，雷达主回波前方的新生的回波单体对飑线发展和持续十分有利，而它的新生与边界层的辐合线相联系，因此，充分利用中尺度地面观测资料有助于飑线的发展研究。

In order to effectively forecast or forewarn squall lines and verify the effectiveness of the nowcasting system,a squall line occurring on 1 August 2006 in Beijing is analyzed by using conventional weather data,automatic weather station data,Doppler radar data,and the nowcasting system.

为了对飑线这类强天气作有效的预报、预警，同时对临近预报系统的预报效果作初步的检验，利用常规气象资料、自动站资料、多普勒雷达资料，结合临近预报系统分析了2006年8月1日北京地区飑线天气过程。

The severe storms on the squall line had large radar reflectivity and high tops of echoes. There was a divergence at lower level, a convergence at middle level, and a divergence at upper level in the velocity cross section of the squall. The VIL (Vertical Integrated Liquid water) of the storms increased rapidly to a large value, which is a good indictor of hailstorm. When the probability of severe hail is larger than 30% according to the hail index products, a hail storm is very likely to happen. The convergence line in the boundary can trigger and intensify convections.

结果表明：飑线是在有利的天气形势下发生的，飑线上强风暴的强度大、高度高；飑线速度剖面图中显示有低层辐散、中层辐合、高层辐散的特征；垂直累积液态水含量迅猛增加到比较大的数值对冰雹预报有很好的指示意义；在冰雹指数产品中以强冰雹概率大于30%作为冰雹预警门限则有较好的效果；边界层辐合线起到了触发对流和加强对流的作用。

Using Mesoscale ARPS model and its data analysis system ADAS, which were developed at the Center for Analysis and Prediction of Storms, the University of Oklahoma, three Doppler radars cardinal data of Qihe of Jinan, Linyi and Lianyungang were assimilated and comparative experiments were conducted for the "428" squall line process.

利用美国俄克拉何马大学风暴分析和预测中心开发的中尺度ARPS模式及其资料分析和同化系统ADAS，将山东省济南齐河、临沂和连云港3部多普勒雷达基数据资料同化进ARPS模式中，对山东"428"飑线过程进行了数值对比试验。

It is also emphasized that analysis of horizontal distribution of instability energy and cold advection is useful for forecasting the area in which squall lines occur.

还指出分析不稳定能量和中上层温度平流的水平分布对预报飑线发生的区域是有用的。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？