| 2015年12月新疆极端暴雪天气过程分析* |
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| 引用本文： | 张俊兰,杨霞.2015年12月新疆极端暴雪天气过程分析*[J].新疆气象,2018,12(5):1-9. |
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| 作者姓名： | 张俊兰 杨霞 |
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| 作者单位： | 新疆维吾尔自治区气象台;新疆维吾尔自治区气象台;中亚大气科学研究中心;,新疆维吾尔自治区气象台;新疆维吾尔自治区气象台 |
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| 摘 要： | 2015年12月10-12日新疆大面积暴雪是欧洲脊发展衰退、乌拉尔低槽东移南下环流形势下的极端强天气过程，环流形势、高低空系统配置与新疆强降水研究成果1-3]吻合，高低空三支急流是大尺度上升运动维持和水汽输送、辐合的重要系统。暴雪过程中存在3条水汽输送路径，水汽长时间向暴雪区输送且输送厚度较厚，水汽辐合从低层发展、东移时层次抬升强度增强，水汽输送和辐合主要出现在低层700-850hPa，当水汽输送层和辐合层降低、强度减弱后最强降水开始。天山地形强迫抬升作用明显，低层水汽在天山北坡聚集抬升，低层冷垫有利于中层西南暖湿气流向北输送。环流经向度大和槽前偏南风强、天山地形的强迫抬升和上升运动维持以及水汽持续输送和3条中尺度云带的持续影响是此次新疆极端暴雪形成的重要机制。
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| 关 键 词： | 新疆极端暴雪 水汽 动力抬升 中尺度云团 |
| 收稿时间： | 2017/2/14 0:00:00 |
| 修稿时间： | 2018/3/17 0:00:00 |
The analysis to formation mechanism of extreme blizzard weather in December of 2015 |
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| Zhang Junlan,Yang Xi,LI Jiangang and Qin He,Min Yue.The analysis to formation mechanism of extreme blizzard weather in December of 2015[J].Bimonthly of Xinjiang Meteorology,2018,12(5):1-9. |
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| Authors: | Zhang Junlan Yang Xi LI Jiangang and Qin He Min Yue |
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| Abstract: | The extreme Blizzard weather process in Xinjiang area on December 10-12, 2015 occurred in the background of European ridge development, Ural low trough moving eastward and southward. Atmospheric circulation, high and low level system configuration coincides with research result for Xinjiang precipitation studies 1-3], consistent, four airflow from high to low level and three jet stream was important to maintain the large-scale upward motion, water vapor transportation and convergence. three transport paths on water vapor existed during the process, longtime and thicker water vapor transportation to blizzard area, the development of water vapor convergence from the lower level and enhancement of lifting strength while eastward, and water vapor transport convergence occurring mainly in the lower 700-850hPa made favorable conditions for the heavy snowfall. the strongest precipitation began after attitude reduction and decreased intensity of the water vapor transportation layer and the convergence layer. low-level water vapor was accumulated and uplift owing to Topographic forcing in Tianshan Mountains, the cold pad in low-level lead to the transportation of southwest warm and moist air in the middle level northward. Meridional circulation, strong southerly wind in front of trough, terrain forced uplift in Tianshan Mountains, sustainable upward motion and water vapor transportation, the continuing impact of three mesoscale cloud band was significant mechanism for the formation of this process. |
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| Keywords: | Xinjiang extreme blizzard water vapor dynamic uplift mesoscale cloud system |
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