| 云迹风资料在热带气旋移向预报中的应用 |
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| 引用本文： | 冯业荣.云迹风资料在热带气旋移向预报中的应用[J].气象,1999,25(12):11-16. |
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| 作者姓名： | 冯业荣 |
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| 作者单位： | 广州中心气象台,510080 |
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| 摘 要： | 利用云迹风并结合实测风，从涡度方程出发，对１９９８年南海和西太平洋的几个热带气候进行诊断计算。结果反映，涡度局地变率ｅ↓ζ／ｅｔ对热带气旋移动有指示意义，它既可批示热带气旋正常路径，在引导气流不明显的情况下，也能对气旋的转折路径有较明显的反映，气旋常朝涡度局地变率最在的方向移动。当热带气旋周围有数个ｅ↓ζ／ｅｔ中心时写和提交 矢量合成法确定了气旋的最大可能移动方向。此外，玷如引导气流一样，热带气旋
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| 关 键 词： | 云迹风 热带气旋 路径预报 |
The Application of Cloud Track Wind Data to the Tropical Cyclone Movement Prediction |
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| Feng Yerong.The Application of Cloud Track Wind Data to the Tropical Cyclone Movement Prediction[J].Meteorological Monthly,1999,25(12):11-16. |
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| Authors: | Feng Yerong |
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| Abstract: | ased on the cloud track winds and the upper sounding winds,the first three terms ofright hand side of the fractionless barotropic vorticity equation, e. g. the relative vorticity advection, the planetary vorticity advection and the divergent term were calculated. The sum ofthese three terms gave an estimate of the local vorticity variation rate. Computations werecarried out to some tropical cyclone cases for the year 1998 over the region of the South China Sea and the Western Pacific. Results show that the local vorticity variation rate hasspecial significance in indicating tropical cyclone movement,and it can indicate obviously botha steady track of tropical cyclone motion and a sudden turning on tropical cyclone movement.Tropical cyclones move generally toward the direction of maximum local vorticity variationrate. If has several maxima in the vicinity of tropical cyclone center, vector compositionmethod may give a mostly probable direction of tropical cyclone motion. In addition, just asthe steering current, there is an effective radius of interaction in U field,within the effectiveradius the changes in field may have a direct influence to tropical cyclone motion. |
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| Keywords: | : cloud track wind tropical cyclone track prediction |
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