| 麦莎台风登陆后能量过程与水汽供应的诊断研究 |
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| 引用本文： | 龚晓雪,赵思雄.麦莎台风登陆后能量过程与水汽供应的诊断研究[J].气候与环境研究,2007,12(3):437-452. |
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| 作者姓名： | 龚晓雪 赵思雄 |
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| 作者单位： | 1. 中国科学院大气物理研究所,北京,100029;中国科学院研究生院,北京,100049
2. 中国科学院大气物理研究所,北京,100029 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金 |
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| 摘 要： | 对0509号台风"麦莎(Matsa)"登陆后长时间维持并轻度加强的过程进行了诊断研究,此过程涉及到多种因素.位涡分析表明,当中纬度西风槽东移,该槽底部分裂出的一个较小的正位涡中心与"麦莎"合并使"麦莎"的涡旋动能增强,而在9日之后"麦莎"与槽主体合并的阶段,槽区主要的正位涡中心与"麦莎"融合.动能收支分析发现,"麦莎"登陆北移过程中,高层的无辐散风穿越等高线将位能转换为动能这一过程较"麦莎"的整体加强为早,而辐散风是低层动能的主要来源.中低层天气尺度系统为积云对流的发展提供动能,而积云对流释放潜热又为高层动能的维持提供了帮助.将"麦莎"与北美"Agnes"飓风比较后发现,"麦莎"加强程度比"Agnes"较弱的原因之一,是高层的无辐散风把台风环流内的动能向环境输出,而"Agnes"飓风则是环境区有大量动能向台风环流区输送.分析水汽来源可知,在"麦莎"登陆期间及其后副热带和热带的两条水汽通道同时或分别为"麦莎"的积云对流提供了足够的水汽供应.
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| 关 键 词： | 热带气旋 维持机制 位涡分析 动能收支 |
| 文章编号： | 1006-9585（2007）03-0437-16 |
| 修稿时间： | 2007-01-202007-03-10 |
Diagnosis on Energy Budget and Moisture Supply of Matsa after Landfall |
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| KUNG Hiusuet and ZHAO Si-Xiong.Diagnosis on Energy Budget and Moisture Supply of Matsa after Landfall[J].Climatic and Environmental Research,2007,12(3):437-452. |
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| Authors: | KUNG Hiusuet and ZHAO Si-Xiong |
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| Institution: | 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 ;2.Graduate University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | A diagnostic study has been conducted on the sustaining mechanism of Typhoon Matsa(2005) which traveled northwards after landfall in Zhejiang Province with a Strong Tropical Storm intensity.The Ertel Potential Vorticity(EPV) analysis indicates that a small positive EPV anomaly at the bottom of the approaching midlatitude trough was an important source of vorticity for the modest re-intensification of Matsa,the main positive EPV area merged with Matsa after 9 August,2005.The kinetic budget anaysis shows that the kinetic energy(KE hereafter) generated by non-divergent wind component was prior to the intensification of Matsa,divergent wind component was the main kinetic energy source in the low-level,and the cumulus(sub-grid scale system) convection is another mechanism of upward kinetic energy transportation other than large scale ascending.The difference of KE transported by non-divergent wind between Matsa and Agnes(1972),which experienced strong re-intensification,may be an important reason why Matsa did not reintensify greatly as Agnes.Traveling on land,there are two moisture channels providing abundant water vapor for the maintenance of Matsa. |
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| Keywords: | landfall tropical cyclone sustaining mechanism PV analysis kinetic energy budget |
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