upper trough 中文意思是什麼
upper trough
解釋
高空槽-
Wet and dry numerical simulation tests for explosive cyclone over western pacific were performed. by contrast the results show that : tropopause and constant temperature surface were raised by latent heat release in upper level and disturbance trough was produced because air flow ascended and became cold. owing to this process adaption, inertial instability emergenced
對氣旋強烈爆發的過程進行干濕對比數值模擬試驗，得出：潛熱釋放使對流層項和等溫面抬高，氣流在高層的上升冷卻形成擾動槽，其適應過程使高層出現慣性不穩定。 -
The diagnostic analysis for the sandstorm process on the base of height, temperature, pressure and wind etc output from the model shows that the upper cold trough, low - level wind shear, surface cold anticyclonic ridge, mesoscale cyclone and cold front are the main synoptic systems, surface cold anticyclonic ridge and cold front provide condition of wind force to occurrence of the sandstorm weather, the strong mesoscale cyclone before front makes pressure gradient before and after cold front obviously strengthen, moreover, and it increases obviously the temperature of the controlled area, as a result, the updraft movement caused by convergence before front strengthens
500hpa強鋒區、 700hpa切變和鋒前中尺度系統的強弱及位置變化是沙塵暴天氣發生發展到減弱的直接原因。地面冷高壓、地面氣旋及冷鋒是造成本次沙塵暴天氣的主要地面天氣系統。地面冷高壓及冷鋒為沙塵暴天氣的發生提供了風力條件，而中尺度氣旋使冷鋒前後氣壓梯度明顯增強外，又使所控制的區域增溫明顯，使鋒前輻合上升運動加強，為沙塵暴天氣的發生提供了熱、動力條件。 -
The main relative systems of heavy - hard rainfall in northeast plateau are western pacific subtropical high, south asia high, low latitude systems, upper level jet ( ulj ), low level greater wind speed axes, westerly trough and plateau trough, low level vortex, cold frontal, occluded front in qinghai lake, mesoscale low pressure, heat low - pressure in qinghai, shear line and convergence line, mesoscale cloud cluster, etc. the west subsidiary model of south asia high is the main circulation type of heavy - hard rainfall in this area
3 、西太平洋副高、南亞高壓、低緯系統、高空急流、低空大風速軸；西風槽和高原槽、低渦、冷鋒、青海湖錮囚鋒以及中尺度低壓、青海熱低壓、切變線與輻合線、中尺度雲團等系統是高原東北部地區大到暴雨的主要相關系統。 100hpa上的南亞高壓中心強度加強，位置東西擺動預示高原地區將有降水產生，中心強度減弱，降水過程結束。南亞高壓西部副型是高原東北部地區大到暴雨的主要流型。 -
The squall line is a kind of instable and strong convective weather caused by the air with upper - layer dry and lower - layer wet in front of the upper - troposphere trough
分析指出，該颮線系統是由高空槽前型的上干下濕引起的不穩定強對流天氣。 -
( 4 ) in summer, tropic west pacific ssta decadal change infect precipitation decadal change in south and north of changjiang river maybe by : positive ssta in tropic west pacific weaken the summer monsoon circulation, lead more precipitation in south of changjiang river and less precipitation in north of it, vice versa ; middle north pacific ssta decadal change infect precipitation decadal change in mid - down valley of changjiang river maybe by : when ssta is negative in middle north pacific, the height field in tropic rises obviously, the subtropical high strengthens and extends westward, the northern limit retreats southward, leads upper trough retreats northward and move eastward, meiyu front moves northward, then leads more precipitation in mid - down valley of changjiang river, vice versa ; middle northwest pacific - low latitude mid - east pacific infects precipitation in north china possibly by change the activity of northeast china cyclone
（ 4 ）熱帶西太平洋ssta年代際變化影響夏季中國長江南北降水年代際變化的可能機制是熱帶西太平洋海表溫度正（負）異常減弱（加強）東亞夏季風環流，從而使江南降水增加（減少） ，江北降水減少（增加） ；夏季中部北太平洋ssta年代際變化影響中國長江中下游地區夏季降水年代際變化的可能機制是中部北太平洋海表溫度負異常，將導致熱帶地區高度場普遍增高，副高加強西伸，副高北界南退，致使高空槽北縮東移，梅雨鋒西移北進，中國長江游中游、中卜游降水增多，反之亦反；夏季中高緯西北太平洋一低緯中東太平洋反向距平分佈結構影響中國東北降水的可能機制是低緯中東太平洋海表溫為負異常。 -
The results show that the weather process occurs because of typhoon trough with cold air, deep upper trough ; the southeast low - jet by typhoon transported large water vapour and great energy of instability to heavy rainfaill area ; cold air, lower convergence and upper divergence by deep upper trough lead to development of the east - ocean low pressure and occurd strong wind
分析結果表明：這次天氣過程是由臺風倒槽和冷空氣及深厚的高空槽共同作用引起的；臺風環流引起的東南低空急流為暴雨區輸送了大量的水汽和不穩定能量；冷空氣的侵入加上深厚的高空槽引起的低空輻合、中高層輻散，促使了東海低壓的劇烈發展，產生了猛烈的大風。 -
While the precipitation of southeast of inner - mogolio is attributed as the strong convective precipitation, the rainfall of liaoning and northeast of heilongjiang is induced by subtropical high and westerly trough, and that of west of heilongjiang is influenced directly by vortex in upper air
各區域產生極端降水的天氣背景也不相同：內蒙古東南部的降水是前傾槽引起的強對流降水天氣，遼寧和黑龍江東北部的降水是由於副熱帶高壓和西風槽的共同作用引起的。黑龍江西部的降水是由於高空渦的直接作用引起的。 -
At last the type of cyclone reintensification was discussed. it is a compound process of type a and type b extratropical cyclone, so it is an interaction process between transformed cyclone in lower level and trough in upper level
討論了臺風登陸后再度發展的演變模型，可以認為是一種a類和b類溫帶氣旋發展的混合類型，是一個低層變性氣旋和高空低槽相互作用和相互發展的過程。
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