| 乌鲁木齐一次暴雪过程地形敏感性试验 |
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| 引用本文： | 朱雯娜,张茜,谭艳梅.乌鲁木齐一次暴雪过程地形敏感性试验[J].新疆气象,2017,11(4):62-69. |
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| 作者姓名： | 朱雯娜 张茜 谭艳梅 |
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| 作者单位： | 民航新疆空管局气象中心,民航新疆空管局气象中心,民航新疆空管局气象中心 |
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| 摘 要： | 以NCEP资料为初始场和侧边界条件,利用WRF模式对东、西天山地形对2015年12月9—12日大暴雪影响进行敏感性试验,从降水强度和分布等方面对比分析模拟结果,探讨地形在暴雪过程中的作用,对成因进行初步研究分析,结果表明:(1)此次强降雪发生是高空西南急流抽吸、低层风切变及风速辐合、偏北风与地形强迫抬升、地面冷锋移动缓慢等共同造成的。(2)此次暴雪天气过程,地形对强降雪的落区、强度影响很大,东、西天山高度与强降雪强度正相关,东、西天山高度降低、强降雪落区沿环流方向移动。(3)地形动力强迫整体上增强次级环流圈。近地面上升速度中心出现在迎风坡山脚至山腰区域,并向两侧递减,与此次大暴雪中心落区以及乌鲁木齐附近测站降雪量分布吻合,东、西天山地形高度降低50%,近地面上升速度中心值减少30%。地形强迫东、西天山峡谷近地面生成辐合中心和辐合线,辐合中心强度与地形高度正相关。(4)地形强迫抬升有加强水汽辐合汇聚的作用,东、西天山地形高度降低50%,水汽通量与水汽通量散度减少30%。
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| 关 键 词： | 暴雪 地形敏感性 次级环流 |
| 收稿时间： | 2017/6/6 0:00:00 |
| 修稿时间： | 2017/6/23 0:00:00 |
Sensitivity Experiments for Effect of Terrain on an Extreme Blizzard in Urumqi |
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| zhuwenn,and.Sensitivity Experiments for Effect of Terrain on an Extreme Blizzard in Urumqi[J].Bimonthly of Xinjiang Meteorology,2017,11(4):62-69. |
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| Authors: | zhuwenn and |
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| Abstract: | Using NCEP data as initial field and lateral boundary conditions, sensitivity experiments for effect of terrain on the East and West Tianshan mountains on an extreme blizzard were performed with the WRF model. Comparing precipitation intensity and distribution and other aspects, to explore the effect of terrain on the blizzard, results showed that: (1) the occurrence of extreme blizzard is caused by upper southwest jet pumping, low-level wind shear and wind speed convergence, north wind and orographic forced uplift, and slow movement of cold front. (2) The topography has a great influence on the falling area and intensity of heavy snowfall. The altitude of the East and West Tianshan Mountains is positively related to the intensity of heavy snowfall. The altitude of the East and West Tianshan Mountains decreased, and the falling area of heavy snowfall follows the circulation direction. (3) The orographic forcing enhances the secondary circulation. The rising velocity center near ground is on the windward slope from the foot of mountain to the mountainside, it coincides with the extreme blizzard center and the snowfall distribution nearby Urumqi station. The altitude of the East and West Tianshan Mountains decreases by 50%, the rising velocity center near ground decreases by 30%. The terrain force produces the convergence center and convergence line near the ground in the Tianshan valley, and the intensity of convergence center is positively related to the terrain height. (4) The orographic forcing enhanced the convergence of water vapor convergence. The altitude of the East and West Tianshan Mountains decreases by 50%, and the water vapor flux and water vapor flux divergence decrease by 30%. |
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| Keywords: | Extreme Blizzard Terrain sensitivity Secondary circulation |
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