| 2003年夏季梅雨期一次强气旋发展的位涡诊断分析 |
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| 引用本文： | 赵兵科,吴国雄,姚秀萍.2003年夏季梅雨期一次强气旋发展的位涡诊断分析[J].大气科学,2008,32(6):1241-1255. |
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| 作者姓名： | 赵兵科 吴国雄 姚秀萍 |
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| 作者单位： | 1.中国气象局上海台风研究所, 上海 200030;中国气象科学研究院灾害天气国家重点实验室, 北京 100081 |
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| 基金项目： | 国家自然科学基金资助项目40575028和灾害天气国家重点实验室基金资助项目2006LASW06 |
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| 摘 要： | 通过位涡诊断和回推轨迹分析, 对2003年夏季梅雨期间一次强江淮气旋的发展过程进行了研究。结果表明: 气旋发展初期, 非绝热加热在气旋的低层发展中起了主要作用, 随后由于高层水平平流的增强, 通过垂直平流使高低层大值位涡耦合在一起, 从而使气旋迅速发展。从中、 高、 低层对位涡柱形成所起的作用来看, 低层主要是非绝热加热, 中层是垂直平流, 而高层主要是水平平流; 从构成气旋的气流来说, 在气旋迅速发展阶段, 低层主要以西南暖湿气流为主, 高层 (500 hPa以上) 主要以沿急流轴下降的高层干冷气流和对流层底层流向气旋东北部并迅速上升的暖湿气流为主。高低层冷暖空气的相互作用主要发生在600 hPa及以上层次, 因凝结加热引起的垂直运动通过垂直平流可能在冷暖气流相互作用和上下大位涡的垂直耦合中发挥了重要作用。
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| 关 键 词： | 梅雨 气旋 位涡 轨迹 |
A Diagnostic Analysis of Potential Vorticity Associated with Development of a Strong Cyclone during the Meiyu Period of 2003 |
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| ZHAO Bingke,WU Guoxiong and YAO Xiuping.A Diagnostic Analysis of Potential Vorticity Associated with Development of a Strong Cyclone during the Meiyu Period of 2003[J].Chinese Journal of Atmospheric Sciences,2008,32(6):1241-1255. |
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| Authors: | ZHAO Bingke WU Guoxiong and YAO Xiuping |
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| Institution: | 1.Shanghai Typhoon Institute, China Meteorological Administration , Shanghai 200030;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 1000812.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1000293.China Meteorological Administration Training Center, Beijing 100081 |
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| Abstract: | Based on diagnostic analyses of potential vorticity(PV) and backward trajectory,development of a strong cyclone during the Meiyu period of 2003 is investigated.Results show that diabatic heating is a key in the growth of low-level cyclone at the early stage,and subsequently,due to strengthening of the upper-level horizontal advection,the cyclone rapidly develops as the vertical coupling between the upper-and low-level PV maxima takes place through the vertical advection.In terms of major contributions from different levels to PV column's formation,the diabatic heating is in the low troposphere,the vertical advection in the middle troposphere and the horizontal advection in the upper troposphere.During the rapid development period,the low-level vortex is primarily formed from the southwest warm-wet flow,and the upper-level one is from the downward northwest stratospheric cold-dry flow along the jet axis and upward southwestern low-level tropospheric warm-wet flow which approaches to the northeastern part of the cyclone.The interaction between cold and warm flows mainly occurs over 600 hPa level,and the vertical motion associated with condensational latent heat,through the vertical advection,plays an important role in the interaction between the cold and warm flows and in the vertical coupling between the upper-and low-level PV maxima. |
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| Keywords: | Meiyu cyclone potential vorticity track |
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