查询词典 cold front

It is found that for the mesoscale mountain of steep slope, the dynamical effect of orographic disturbance weakens cold front on the upwind side and strengthens cold front on the mountain top, the frontal intensity is decreased when front moves downslope rapidly.

另外发现锋面强度也是影响地形扰动与锋面相互作用的重要因素，当锋面比较强时，地形扰动与锋面会发生强的相互作用，在地形扰动对锋面产生影响的同时，锋面的过山会引起地形扰动的强烈变化。

A cold front is the forward edge of a mass of moving cold air .

冷锋就是移动的冷空气团的前锋。

The STE dominated by the intrusion of stratospheric air has been testified as a cause of ozone enhancement in upper troposphere over East Asia at the end of March 2001. This STE relates to the surface high moving southward, the upper cold eddy deepening and drifting eastward, the convergence of Subtropical Jet and Polar Front Jet associated with the cold front, the increasing temperature gradient near the jets, and the enhancing baroclinic instability.

天气诊断和动力分析表明，2001年3月底东亚地区几个臭氧探空测站探测到的对流层上层臭氧增加是以平流层空气下传为主的STE过程导致的，此过程与地面冷高压南下、高空冷涡加深东移的天气过程、以及冷锋推进引起的副热带急流和极锋急流的移动和汇合、急流附近的温度梯度加大、斜压不稳定增强等动力因素密切相关。

The relationship of front and weather: They had the right conception of "front" and "air mass" as scientists, but some students were easily mixing the concept of cold front , warm front and stationary front.

锋面与天气的关系：对於锋面与气团的概念具有符合科学家的概念。但是对於冷锋、暖锋及滞留锋的天气状况，部分学童仍有混淆的情形。

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。

Weather Forecast A cold front is swinging in from Canada while a warm front is moving up from the Pacific.

天气预报一道冷锋是在摇摆中，来自加拿大，而暖锋正从太平洋。

To force upward from Earth's surface, as when a cold front overtakes and undercuts a warm front .

使锢囚迫使从地球表面上升，如在冷锋压过并削弱暖锋时

A roll cloud is a low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front, or sometimes a cold front.

架状云层位置低，在水平面上如同一个弧状三角形。

The result shows that the strong sandstorm mainly appeared in Feb. to Jun., the strong sandstorm was caused mainly by momentum downloading gale of strong northwest air current before the high-pressure ridge in Jan. to Mar., the strong sandstorm was caused mainly by frontal area wind of cold air moving to southeast with ground cold front transiting.

发现强沙尘暴主要出现在2~6月，1~3月出现的强沙尘暴主要为高压脊前强西北气流动量下传风所致；4~7月出现的强沙尘暴主要为冷空气东移南下伴随地面冷锋过境锋面大风所致。

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。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。