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| 台湾岛地形对台风“海棠”(0505)移动路径影响的数值试验研究 |
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余贞寿1, 郝增周2,3, 谢海华1, 张天河1
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1.浙江省温州市气象局, 浙江, 温州, 325027;2.南京信息工程大学大气科学系, 江苏, 南京, 210044;3.卫星海洋环境动力学国家重点实验室/国家海洋局第二海洋研究所, 浙江, 杭州, 310012
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| 摘要: |
| 利用非静力模式MM5模拟台风"海棠"(0505)穿过台湾岛再次登陆的移动路径,分析了"海棠"登陆台湾岛前后结构特征变化。结果表明:台风自身的非对称结构与台风异常移动路径密切相关。另外,就台湾岛地形对台风"海棠"登陆台湾前打转和在台湾海峡出现"V"型移动异常路径影响进行数值试验表明:台湾岛地形不但可以直接影响台风移动路径,而且通过影响台风非对称结构来改变台风移动路径,因此,登陆台湾前逆时针打转异常路径是在弱引导气流中台风自身非对称结构和台湾岛地形共同作用的结果;台湾岛地形有使台风东北-西南向非对称增大趋势,而在台风进入台湾海峡前后对东南-西北向非对称有明显不同影响。 |
| 关键词: 台风 非对称结构 路径 地形 |
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| 基金项目:温州市气象科技重点资助项目(S200601)资助 |
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| A NUMERICAL STUDY OF THE EFFECT OF TAIWAN ISLAND TERRAIN ON TYPHOON HAITANG (0505) TRACK |
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YU Zhen-shou1, HAO Zeng-zhou2,3, XIE Hai-hua1, ZHANG Tian-he1
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1.Wenzhou Meteorological Bureau, Wenzhou 325027, China;2.Department of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China;3.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012
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| Abstract: |
| The track of Typhoon Haitang(0505),which passed through the Taiwan Island and landed again,was successfully simulated by using the non-hydrostatic mesoscale atmospheric model MM5.Its structure was analyzed on the landing stage,and it could be found that there existed good relationships between the typhoon abnormal moving track and its asymmetry structure.The effect of terrain of Taiwan Island on the typhoon Haitang,which made it rotate before landing and present a "V" type abnormal moving track in Taiwan straits,was also simulated.Further analysis showed that the terrain of Taiwan Island not only directly affected the typhoon moving track,but also changed the typhoon track by affecting its asymmetric structure.Therefore,the typhoon asymmetric structure and the effect of terrain of Taiwan Island together resulted in the abnormal rotating track.The terrain of Taiwan Island tends to increase the SW-NE asymmetric structure of the typhoon and has different effect on SE-NW asymmetric structure during the landfall process of typhoon Haitang before entering and moving out of the Taiwan straits. |
| Key words: typhoon asymmetry structure moving track terrain |