low-level jet 中文意思是什麼
low-level jet
解釋
低空噴流-
Analyzing the physics structure of vorticity, divergence, vertical velocity, frontogenesis " function, apparent heat source and apparent moist sink etc. indicated the physics fields are favorable for the occurance of the heavy rain over changjiang - huaihe river basin where the physics values are well according to the heavy rainstorm positions ; the low level jet is closely subject to the moisture and the coupled system of the low and the upper level jetstreams induced the strongly " ascending motion ; the intensity of the frontogenesis varies with the development of the rainfall system and reacts the rainfall intensity
主要分析了這次過程中的多種物理量，包括渦度、散度、垂直速度、鋒生函數、視熱源、視水汽匯等，對這一暴雨過程有了比較系統的認識。結果表明：在江淮流域存在著有利於發生暴雨的物理量場配置，渦度、散度、垂直速度等物理量，與暴雨的落區都很吻合的；低空急流的產生不僅有利於水汽的輸送，而且高低空急流的耦合造成了有利於強上升運動的配置；鋒生強度隨著降水系統的發展變化，並影響降水強度。 -
The positive storm - relative helicity center is accompany with low - level jet in 850 - hpa isobaric surface fields
通過分析我們發現了正的相對螺旋度中心與850hpa低空急流的演變過程是一致的。 -
The result indicates that, in the course of the rainstorm in huoshan, there are obvious low - level jet of great intensity, infection of mesoscale shear line, enhancement of plus vorticity which increases intensity of convergence, improves ascending velocity and brings on precipitation, and quick enhancement of helicity which provides the basis to forecast, in addition, convergence of moisture flux and analyzed potential vorticity which reflects baroclinic convective instability sufficiently indicate the characteristics of the rainstorm
結果表明：此次霍山暴雨發生前後，存在明顯的大強度低空急流，並受到中尺度切變線的影響，而且正渦度的加強引起了輻合加劇，提高了上升速度從而引起降水，同時暴雨發生前螺旋度的迅速增強，也為預報提供了根據，另外水汽通量的輻合以及分析位渦反映出的斜壓對流不穩定都充分體現了這次降水的特點。 -
The activity of cold air and interannual variation of low level jet are important cause of interannual variation of the rainfall in april. interannual variation of subtropic high is the main cause of interannual variation of the rainfall in may over north china. there is significant negative correlation between interdecadal variation of the rainfall in april and that of sst in the areas of equatorial indian ocean and tropic middle - east pacifi
華北4月降水與熱帶中東太平洋、赤道印度洋海溫年代際變化呈明顯的負相關:華北5月降水與熱帶中東太平洋、赤道印度洋海溫年代際變化存在明顯的正相關:熱帶海溫的年代際異常引起的副熱帶高壓的年代際異常可能是影響華北4 、 5月降水異常的重要原因。 -
The shear experienced by the departing aircraft was due to vertical shear as the plane passed through the low level jet. based on the winds measured on - board a flight departing 8 minutes earlier, there was a rapid increase in head wind component, from 13 kt at 1, 420 ft to 39 kt at 3, 100 ft
起飛的飛機所遇到的風切變是由於該機經過低層急流的垂直切變所引致，根據一架在8分鐘前起飛的航機量度到的風速，顯示逆風由1 ， 420尺的每小時13海里急速增加到在3 ， 100尺的每小時39海里。 -
Strongly strengthening of the low level jet and releasing of the latent heat of condensation have effect on the occurrance of the disturbance of the moist potential vorticity in low lever, which is important conditions to the genesis and development of mesoscale vortex
低空急流的加強以及凝結潛熱的釋放均可以影響到低層濕位渦擾動的產生，從而有利於中尺度低渦的生成和發展。減弱低空急流的對比實驗證明了低空急流在對流層中低層中尺度低渦的生成和發展過程中起著關鍵性作用。 -
The analysis of the large - scale synoptic situation shows that strong precipitation is closely related to the explosion of monsoon and the intensification of cross - equatorial flow which bring a lot of vapor and meet with cold masses at the eastern of northwest district on 8th, june causing extremely heavy rainfall ; that subtropical high - level jet at 200hpa, subtropical high at 500hpa and low - level jet at 850hpa are the weather backgrounds favorable to strong precipitation ; that the pattern of eastern highs and western lows and the establishment of a low - level jet and the coupling between upper - and low - level patterns that determine that the rain occurred in the east of the northwest china ( on average, this is the rainy season for the south of china, but not for the northwest china ) ; that water vapor comes from southerly and easterly flow which converge at the eastern of northwest district with convergence mainly in lower levels and pbl ; that the high value of the whole - level apparent heat source < q1 > is near the area of large rainfall in the direction of northeasterly - southwesterly agreeable to shear line very well and the condensation latent heat releasing is main heat source with vertical advection item playing key role in q1 and q2 ; that there is a vertical secondary circulation crossing low - lever jet whose ascending branch is at the area of large rainfall ; that the construction of convection instability and conditional symmetry instability results that there is not only deep thermal instability, but also moisture influx and triggering mechanism of thermal instability causing strong torrential rain
作為對比，本文還對2002年6月24 - 25日發生在北京地區的強地形雨進行了分析，並討論陜南、北京地區兩地暴雨的異同點以及地形作用的共性和個性，為兩地暴雨預報提供有益的參考，得出了一些很有意義的結果： 1大尺度環流背景分析表明： （ 1 ） 「 02 . 6 」強降水與6月上旬越赤道氣流和季風爆發密切相關，攜帶大量水汽的偏南氣流與冷空氣於6月8日交匯在西北地區東部，導致了這次強降水的發生； （ 2 ） 200hpa的副熱帶西風急流、 500hpa副高以及850hpa的低空急流的配置非常有利於本文分析之陜西強降水的發展與維持。大尺度形勢分析表明，東高西低形勢場、低空急流的建立和高低空形勢的配置決定了這場降雨出現在西北地區東部。與暴雨區相聯系，存在一支橫越低空急流的經向垂直環流，暴雨區處于該垂直環流的上升支； （ 3 ）偏南和偏東氣流水汽通道在西北地區東部交匯，水汽的輻合積聚主要在對流層低層和行星邊界層內完成； （ 4 ）整層的視熱源< q _ 1 >高值區在暴雨區附近呈東北-西南向分佈，與切變線走向非常一致，降水產生的凝結潛熱釋放是強降水區大氣的主要熱源。 -
The above analysis showed that this heavy rainfall event took on obvious meso - scale characters and was the combination of the three flows, so we can deduce : ( 1 ) surface southeasterly wind and topography may play the main role in this event ; ( 2 ) the easterly cold air rushing into the southern shaanxi province in the lower troposphere was strongly relative to the form of surface cold - front type of occlusion ; ( 3 ) there were two reasons for the secondary circulation ' s strengthen in the evening, one was the effect of a mountain - valley wind and the other may be latent heat leading to ascending motion ; ( 4 ) the shape of potential instability stratification corresponded well with the development of the warm - moisture advection ; and ( 5 ) the vapor providing essential thermodynamics was transported by a southwesterly low - level jet from the bay of bengal and the south china sea. furthermore, with the effect of terrain, the southern shaanxi province became the center of this extremely heavy rain process
中尺度結構分析表明，本次暴雨具有明顯的中尺度特徵，是由三支氣流共同作用的結果，分析發現（ 1 ）地面東南風和地形在這次大暴雨過程起主要作用； （ 2 ）東路冷空氣主要是通過中低層侵入陜南地區的，並與地面冷式錮囚鋒的形成密不可分； （ 3 ）夜博士論文:中尺度地形對陜南暴雨的影響研究間垂直次級環流發展加強可能有兩個原因，一個是由於地形山谷風的作用，另一個是降水的潛熱釋放激發了上升運動: （ 4 ）位勢不穩定層結的形成與低層暖濕平流的發展有很好的對應關系; （ 5 ）本次暴雨的水汽主要靠偏南風急流將孟加拉灣和中國南海的水汽輸送至西北地區東部，為暴雨的發生提供了必要熱力條件。 -
Severe convergence brought by low - level jet pulsation, and severe divergence brought by upper - level jet is directly trigger mechanism of this intense rainstorm
低層低空急流脈動產生的強輻合，高空急流誘發的高層強輻散是本次東北地區暴雨天氣的直接觸發機制。 -
With the simulated results of the high resolution of space - time, from the aspects of thermodynamic, dynamical, moist available energy and moist potential vorticity, the direct effect mesoscale system was analyzed to this weather process, including mesoscale low level jet, mesoscale vortex etc. meanwhile, its features and physical mechanism of the formation and development are further discussed to seek for some basis for deeper research and storm rainfall forecast
運用高時空解析度的模式結果，從熱力、動力結構、濕有效能量和濕位渦等多個角度，著重分析討論了對這次天氣過程有直接影響的低空急流、中尺度低渦等中尺度系統，探討了影響這次天氣過程的中尺度系統的發生、發展特徵和物理機制，試圖為更進一步的研究和暴雨預報提供一些依據。 -
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 convergence in low layer and the maintenance of torrential rain
分析結果發現，大氣運動非平衡強迫、凝結降水的非均勻分佈與強烈垂直風切變的耦合作用、 「濕度鋒」與低空急流的耦合相互作用通過促進低空輻合流的維持，導致了對流雲團和暴雨天氣的持續。 -
The results show that there are two centers of occurrence of llsw respectively in dong bei and jiang nan ; the regional torrential rain over the yangtze river basin is closely associated with llsw during the major periods of heavy rainfall ; the diurnal variation of the number of occurrence in the middle and low reaches of the yangtze river is the strongest in china there are some significant differences between llj and nallsw in positive season, spatial variation, diurnal variation and field of pressure. by the way, the important effect of inertial stability on heavy rainfall with both low level south - westerly jet and high level northerly strong flow is analyzed theoretically. the results show that the existence of the maximum of inertial stability in the left font of the low level jet is favor of the accumulation of the moist thermal energy, and conditional symmetric instability or convective instability can be expected in this region
另外，慣性穩定性的作用以往不受重視，本文通過對西南低空急流左前方和高空偏北大風軸右後方的慣性穩定性和對稱穩定性的理論分析和實例計算，表明慣性穩定性在伴有高低空急流的暴雨中有重要意義，揭示了梅雨暴雨的一種新的高低空急流耦合機制：低空急流左前方慣性穩定度大值區的存在，有利於低層濕熱能量的積累，使低層傾斜對流的不穩定發展更多期望于條件性對稱不穩定或對流不穩定；高空偏北大風軸（西風急流）的存在，是其右後方（右側）出現對稱不穩定的有利條件，高空相對容易出現干對稱不穩定；慣性穩定性的作用，使低層的傾斜對流更偏向於垂直方向，有利於對流發展，使高層的傾斜對流更偏向於水平方向，有利於高層輻散。 -
The results show that mesoscale low level jet, the perturbation in the high level troposphere can enhance and accelarate occurrence and development of mesoscale system ; convergence of low level and divergence of higher level are dynamical condition of storm rainfall system
本文的研究結果表明，中尺度低空急流、高空擾動對中尺度低渦系統的發生發展有加強和促進作用；低層輻合和高層輻散是降水系統的發展的動力條件。 -
When the baroclinicity of southwest vortex had not been built and where cold front existed, the rain belt may lie in anywhere of the left of southwest low level jet
在西南渦斜壓性未建立之前以及冷鋒附近，暴雨區可位於低層西南風急流左側的任何位置。 -
But when the baroclinicity of low level vortex was strengthened and when warm air came into being, all the rain belts lay in the left and the front of southeast low level jet
當低渦的斜壓性加大，出現暖空氣的作用時，暴雨區均出現于西南風急流的左前方。 -
By mesoanalysis of a precipitation that occurred in the middle reaches of the changjiang river, 8th jul. in 2003, the formation and development of the event, its relation with the meso - microscale system are studied, it is emphasized that the low - level jet would cause favorable thermodynamic, moisture and dynamic conditions for the heavy rainfall in the middle reaches of the changjiang river and that the mesoscale vortex formed in the left of the low - level jet would stimulate strong convective clouds and cause the heavy rain
摘要通過對2003年7月8日發生在長江中游的一場大暴雨進行中尺度分析，初步研究了暴雨的形成及發展過程，總結了暴雨的產生與中小尺度系統的關系，著重闡述了低空急流在暴雨形成中的作用，以及在低空急流左側強正渦度中心附近形成中尺度渦旋，激發暴雨雲團等。 -
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
結果表明：高、低空急流耦合區中西南低渦及mcc特徵雲團的形成和維持是造成此次特大暴雨的直接影響系統。 -
The low - level jet stream is the result of the spread of the momentum from the upper - level jet stream
低空急流是高空急流的動量向下輸送的結果。低空急流的生成先於水汽及降水的爆發。 -
Departing flights were climbing at very steep angles, 9. 6 deg for the one shown above. as a result, the aircraft transit the low level jet very close to the end of the runway and the change in head wind was very rapid
起飛的航機以非常陡的角度爬升，以上提及的飛機用9 . 6度，因此飛機在接近跑道末端經過低空急流而所感受到的逆風轉變非常快。 -
The low - level jet stream has three vibration processes, which corresponded to the three lows " beginning and developing
低空急流有三次脈動過程，與三個低渦的產生和發展對應。
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