| 凉山州两次冬季南支槽降水天气过程对比分析 |
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| 引用本文： | 边茜.凉山州两次冬季南支槽降水天气过程对比分析[J].高原山地气象研究,2020,40(2):53-58. |
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| 作者姓名： | 边茜 |
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| 作者单位： | 四川省凉山州气象局,西昌 615000 |
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| 基金项目： | 四川省科技计划项目(2016JY0046) |
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| 摘 要： | 利用NCEP1°×1°6h再分析资料及常规观测资料，对2018年12月28～30日(过程1)和2019年1月29～31日(过程2)发生在凉山州的两次降温降水天气过程的环流形势、物理量特征、高低空急流配置进行对比分析，结果表明:两次过程均有高空槽、冷空气与南支槽的配合，冷空气路径相同，但强度不同，过程1的冷空气更强；降雪天气的发生与700hPa切变线及0℃等温线位置密切相关；两次过程水汽主要来源于孟加拉湾，低层的水汽辐合对降雨雪天气的水汽起主要作用；两次过程均存在一定的上升运动，均有低层辐合、高层辐散的配置，有利于垂直方向的抽吸作用及上升运动的维持和发展，但过程1的上升运动及高低空配置优于过程2；高低空急流的耦合为降水的发生发展提供了有利的动力和水汽条件。
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| 关 键 词： | 冷空气 降水 南支槽 高低空急流 |
| 收稿时间： | 2020-04-28 |
Comparative Analysis of Two Precipitation Weather Processes Caused by the Southern Branch Trough of Liangshan in Winter |
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| Affiliation: | Liangshan Prefecture Meteorological Bureau, Xichang 615000, China |
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| Abstract: | Based on NCEP reanalysis data of 1 × 1 6h and conventional observation data,the circulation situation,physical quantity characteristics and configuration of upper and lower level jet streams of the two cooling and precipitation weather processes occurred in Liangshan state from December 28 to 30,2018 (process 1) and January 29 to 31,2019 (process 2) are analyzed comparatively. The results show that the two processes have the cooperation of upper air trough,cold air and south branch trough. The cold air path is the same,but the intensity is different,and the cold air in process 1 is stronger. Snowfall weather is closely related to 700hPa shear line and 0℃ isotherm. The water vapor in the two processes mainly comes from the Bay of Bengal,and the convergence of water vapor in the lower layer plays a major role in the water vapor in rainfall and snow weather. Both processes have certain ascending motion,both of which have the configuration of convergence at lower level and divergence at higher level,which is conducive to the vertical suction and the maintenance and development of ascending motion,but the ascending motion and high-low configuration of process 1 are better than process 2; The coupling of high and low level jet provides favorable power and water vapor conditions for the occurrence and development of precipitation. |
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