upper trough meaning in English
高空槽
Examples
- ( 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 ）热带西太平洋ssta年代际变化影响夏季中国长江南北降水年代际变化的可能机制是热带西太平洋海表温度正（负）异常减弱（加强）东亚夏季风环流，从而使江南降水增加（减少） ，江北降水减少（增加） ；夏季中部北太平洋ssta年代际变化影响中国长江中下游地区夏季降水年代际变化的可能机制是中部北太平洋海表温度负异常，将导致热带地区高度场普遍增高，副高加强西伸，副高北界南退，致使高空槽北缩东移，梅雨锋西移北进，中国长江游中游、中卜游降水增多，反之亦反；夏季中高纬西北太平洋一低纬中东太平洋反向距平分布结构影响中国东北降水的可能机制是低纬中东太平洋海表温为负异常。 - 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
分析结果表明：这次天气过程是由台风倒槽和冷空气及深厚的高空槽共同作用引起的；台风环流引起的东南低空急流为暴雨区输送了大量的水汽和不稳定能量；冷空气的侵入加上深厚的高空槽引起的低空辐合、中高层辐散，促使了东海低压的剧烈发展，产生了猛烈的大风。