| 理想模拟的温带气旋中冷暖输送带特征分析 |
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| 引用本文： | 王迪,张熠,储可宽,王新敏.理想模拟的温带气旋中冷暖输送带特征分析[J].大气科学,2022,46(2):346-358. |
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| 作者姓名： | 王迪 张熠 储可宽 王新敏 |
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| 作者单位： | 1.南京大学大气科学学院，中尺度灾害性天气教育部重点实验室，南京 210093 |
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| 基金项目： | 国家重点研发计划;国家自然科学基金 |
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| 摘 要： | 本文利用WRF理想斜压波模式模拟了理想湿大气中温带气旋的快速发展过程,采用拉格朗日轨迹筛选方法识别了气旋内部冷、暖输送带结构,分析了沿着输送带轨迹的物理量演变特征,探究了输送带气流对气旋降水结构的影响.本文在再现前人研究结论的基础上,发现了更精细的输送带结构特征,尤其是对冷输送带特征有了进一步认识.研究表明,根据相对气...
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| 关 键 词： | 暖输送带 冷输送带 温带气旋 结构特征 理想模拟 |
| 收稿时间： | 2020-08-06 |
Characteristic Analysis of Cold and Warm Conveyor Belts in an Idealized Extratropical Cyclone Simulation |
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| WANG Di,ZHANG Yi,CHU Kekuan,WANG Xinmin.Characteristic Analysis of Cold and Warm Conveyor Belts in an Idealized Extratropical Cyclone Simulation[J].Chinese Journal of Atmospheric Sciences,2022,46(2):346-358. |
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| Authors: | WANG Di ZHANG Yi CHU Kekuan WANG Xinmin |
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| Institution: | 1.Key Laboratory of Mesoscale Severe Weather of Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing 2100232.Henan Key Laboratory of Agrometeorological Support and Applied Technique, China Meteorological Administration, Zhengzhou 4500033.Henan Meteorological Observatory, Zhengzhou 450003 |
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| Abstract: | An idealized moist baroclinic wave simulation was performed to describe the rapid development of an extratropical cyclone. Warm and cold conveyor belts were then identified using the Lagrangian trajectory selection method, and physical quantities along their trajectories were diagnosed, followed by the analysis of their impacts on the precipitation. The study similarly presents previous conclusions of conveyor belts and finds some more refined structures, especially for cold conveyor belts. Results reveal that warm conveyor belts could generally split into “forward-sloping ascent” and “rearward-sloping ascent” branches. They originate in the warm sector ahead of the cold front and low level and move respectively forward and rearward relative to the cyclone center when they spiral upward to the upper and middle level, generating a negative potential vorticity disturbance upon the outflow region and promoting the development of the upper system. They also transport abundant moisture upward and significantly influence the formation and maintenance of the precipitation extremum around the front. Cold conveyor belts are confirmed to represent two branches of ascent and the remaining in the lower level as described by previous researches, which could then be classified finely into four branches. “Forward-sloping ascent” and “rearward-sloping ascent” branches originate near the warm front and curve separately forward and rearward relative to the cyclone center when rising upon the middle level, benefiting the rainfalls around the warm front. Meanwhile, branches of “wrapping around the cyclone and forward-sloping” and “wrapping around the cyclone and rearward-sloping” always stay in the lower level and move from the east of the surface cyclone far from the warm front toward the cyclone center whenever their vapor content increases. They then respectively descend anticlockwise and clockwise to the downstream and upstream of the cyclone after traveling slowly upward west of the cyclone around the center, inducing the little precipitation northwest of the cyclone. |
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