| 2018年10月乌鲁木齐暴雪过程锋面分析 |
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| 引用本文： | 李娜,李如琦,秦贺,于碧馨,赵凤环.2018年10月乌鲁木齐暴雪过程锋面分析[J].新疆气象,2020,14(5):36-43. |
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| 作者姓名： | 李娜 李如琦 秦贺 于碧馨 赵凤环 |
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| 作者单位： | 新疆气象台,新疆气象台,新疆维吾尔自治区气象台,新疆气象台,新疆气象台 |
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| 基金项目： | 新疆科技援疆项目（2019E0208） |
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| 摘 要： | 利用地面常规观测、NCEP/NCAR0.25°×0.25°再分析及风廓线雷达等资料，诊断分析了2018年10月17—18日乌鲁木齐极端暴雪天气过程的锋面特征。结果表明：在欧洲高压脊衰退，中亚长波槽分段东移的背景下，天山北坡强烈锋生并持续近30小时，此次锋生是热力和动力共同作用的，天山附近锋面呈带状准垂直分布，动力锋生激发的次级环流使垂直运动维持发展，为大暴雪提供动力条件； 400～600 hPa西南和地面～850 hpa西北路径输送的水汽，在600～800 hPa强烈辐合，为乌鲁木齐暴雪提供充沛水汽。风廓线雷达监测资料水平风向风速的垂直变化、Cn2能够反映锋生和水汽的演变特征，也从观测事实上证实了锋面对动力抬升及水汽辐合的重要作用。
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| 关 键 词： | 暴雪 冷锋 次级环流 风廓线雷达 |
| 收稿时间： | 2020/1/15 0:00:00 |
| 修稿时间： | 2020/6/15 0:00:00 |
Frontal analysis of the Snowstorm Process in Urumqi in October 2018 |
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| Li N,Li Ruqi,Qin He,Yu Bi Xin and Zhao Feng Huan.Frontal analysis of the Snowstorm Process in Urumqi in October 2018[J].Bimonthly of Xinjiang Meteorology,2020,14(5):36-43. |
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| Authors: | Li N Li Ruqi Qin He Yu Bi Xin and Zhao Feng Huan |
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| Institution: | Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory,Xinjiang Meteorological Observatory |
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| Abstract: | Using conventional ground observation, the reanalysis data of NCEP/ NCAR0.25 °×0.25 ° and wind profile radar, the frontal characteristics of the extreme Snowstorm Process in Urumqi on October 17-18, 2018 are diagnosed and analyzed. The results show that under the background of the depression of European high ridge and the eastward movement of the long wave trough in Central Asia, the north slope of Tianshan Mountain is strongly frontogenetic and lasts for nearly 30 hours. This frontogenesis is a combination of thermal and dynamic forces. The front near Tianshan Mountain is in a zonal quasi vertical distribution. The secondary circulation excited by dynamic frontogenesis keeps the vertical movement developing and provides the dynamic conditions for the blizzard; 400-600 The water vapor transported by the southwest route of HPA and the northwest route of ground-850 HPA converged strongly at 600-800 HPA, providing abundant water vapor for the snowstorm in Urumqi. The vertical variation of wind speed in horizontal direction and the evolution characteristics of water vapor can be reflected by the wind profile radar monitoring data, and the important role of the front in dynamic uplift and water vapor convergence can also be confirmed by observation. |
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| Keywords: | blizzard front secondary circulation wind profile radar |
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