high-level cyclone 中文意思是什麼
high-level cyclone
解釋
高空氣旋-
The result shows that : the sand - dust storm occured in favorable climate background that is drought and rainless, the tilted trough and mongolia cyclone are the important weather systems that caused the severe sand - dust storm, tilted trough and strong frontal zone caused the mongolia cyclone developed and the clod front strengthened at surface, high jet and ferrel circulation are the main reason that momentum spreaded downward from higher level and frontal zone strengthened on lower level
結果表明：沙塵暴是在乾旱少雨的有利的氣候背景下產生的。斜壓槽和蒙古氣旋是觸發這次強沙塵暴天氣過程的重要的天氣系統，高空斜壓槽和強鋒區促使了地面蒙古氣旋的發展和冷鋒的加強，誘發沙塵暴天氣。高空急流及其下方的ferrel環流起到了高層動量下傳和加強低層鋒區的重要作用。 -
Because of the low temperature there, water vapour condenses into small, clear crystals. a layer of glossy cirrus forms which drifts out from the centre of the tropical cyclone because of divergence at that level. so, when the outer edge of a tropical cyclone reaches hong kong, we can see cirrus high in the sky
熱帶氣旋強烈的上升氣流會把潮濕的空氣帶到近五六千公尺以上的高空，由於溫度很低，水氣結成了透明的小冰粒，形成像絹絲一樣發光的雲彩-捲雲，這些在高層輻散流場區域的捲雲，會從熱帶氣旋中心向外流出，所以當香港還是位於熱帶氣旋邊緣時，我們便已看到那些在熱帶氣旋外圍的捲雲，並稱為臺母。 -
Low - level cyclone circulation with high - level anticyclone circulation, is helpful to form low - level convergence and high - level divergence, and make the rising airflow nearby cyclone keep and strengthen so that have offered necessity condition for convection precipitation
低層的氣旋性環流和高層的反氣旋性環流相配合，有利於形成低層輻合，高層輻散，使得氣旋附近的上升氣流得以維持和加強，從而為對流性降水提供了必要條件。 -
The article point out that the downward transport of the high moist potential vorticity from high level causes the development of low level cyclone. the rainfall may occur near the south area of positive center of mpv1 and negative region of mpv2 at 500hpa
在整個降水過程中，副熱帶高壓穩定少動，其西北側的暖濕氣流為強降水提供了充沛的水汽條件，地面冷鋒和高原低渦是其抬升機制。 -
A transverse secondary circulation is produced by the coupling of high and low jets, while the sinking branch of the secondary circulation providing the dynamic conditions for the dry intrusion air. during the period of the heavy rain process, dry intrusion descends southward along the intense constant potential temperature lines, which promotes the lower cyclone. in addition, the pouring of upper - level dry air not only decreases ground temperature behind the front but also increases surface pressure and velocity
由於高、低空急流耦合，在高空急流中心左側產生的下沉運動和高空急流中心右側、低空急流左側產生的上升運動在鋒面上形成一次級環流，次級環流的下沉支運動為對流層高層干空氣和高位渦的下傳提供了動力條件；進一步研究發現，干侵入沿相當位溫密集帶向南向下伸展，引起對流層低層氣旋性渦度的發展；此外，高層乾冷空氣向下注入，導致地面溫度降低、氣壓升高、風速加大、低層輻合增強、上升速度加大，從而促進了新的對流運動，引起降水增強。
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