能量净输送与台风的移动
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作者单位
唐东升  
丁志英  
中文摘要:基于能量场的变化与台风移动有密切关系的事实,本文试图从讨论能量场的变化入手,探讨通过预报能量场系统的移动以预报台风移动的方法。通过对7504、7708、7806、7909、7910号台风总湿位能场的分析,发现台风在各层等压面上均对应着闭合的能量场系统(700毫巴以上▽2Eσ<0,低层▽2Eσ>0),且两者的移动路径一致。此外,能量通量场和能量通量散度场的分析结果表明,在台风的进路方向有明显的强能量输送带,台风基本上沿着500毫巴能量水平通量散度梯度的方向移动。VEσ图和▽·(Eσ)图可以作为定性判断台风疑难路径的一种辅助工具。
 
On the Net Energy Transport and Movement of Typhoons
Abstract:The study is based on the close relation between energy fields and the motion of typhoons in attempt to develop a new means for forecasting the movement of the depressions by examining the variations in energy fields.By investigating the total moist potential fields of Typhoons numbered as 7504,7708,7806,7909 and 7910, the authors have found the correspondence between these fields at isobaric surfaces and the closed energy field system (▽2 Eσ<0 above 700mb and ▽2 Eσ<0 at lower levels)as well as the same trends in their movements. Moreover, analysis shows that there exists an intense energy transport belt along the typhoon’s track as the tropical cyclone moves and travels basically in the direction of gradients of horizontal flux at 500mb level, Charts of VEσ and ▽·( Eσ) can be used as an additional means for judging typhoon movements in troublesome situations.
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