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张超,陈春艳,吐莉尼沙,施俊杰,安大维,张俊.2018年5月天山南坡两次翻山大风成因对比分析 [J].沙漠与绿洲气象,2019,13(5):1~8
2018年5月天山南坡两次翻山大风成因对比分析
Comparative Analysis of Two Gale cases in the Southern Slope of Tianshan Mountains in May 2018
投稿时间:2019-03-29  修订日期:2019-05-31
DOI:10.12057/j.issn.1002-0799.2019.05.001
中文关键词:  翻山大风  垂直环流圈  天山南坡  锋生
英文关键词:mountain-climbing gale  vertical circulation  Southern Slope of Tianshan  frontogenesis
基金项目:中国沙漠气象科学研究基金
作者单位E-mail
张超 新疆维吾尔自治区气象台 新疆 乌鲁木齐 64418696@qq.com 
陈春艳 新疆维吾尔自治区气象台 新疆 乌鲁木齐  
吐莉尼沙 新疆维吾尔自治区气象台 新疆 乌鲁木齐  
施俊杰 新疆维吾尔自治区气象台 新疆 乌鲁木齐  
安大维 新疆维吾尔自治区气象台 新疆 乌鲁木齐  
张俊 新疆维吾尔自治区气象台 新疆 乌鲁木齐  
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中文摘要:
      利用高空、地面常规探测资料及ERA-interim 0.25°×0.25°再分析资料,对2018年5月7日和24日影响天山南坡的两次翻山大风天气进行诊断分析。结果表明:500hPa两脊一槽的经向环流是两次大风的环流背景,西南-东北走向的冷槽、300hPa高空急流、低空急流、巴尔喀什湖冷高压、南疆盆地热低压是主要影响系统;强的水平气压梯度力和地形产生的下坡效应是主要原因,对流层中层强冷平流侵入南疆是造成大风天气的重要热力条件;大风最强时段与经向垂直环流圈出现时间、维持时间有较好对应;大风期间,天山山区附近500-800hPa有强烈锋生现象,自低到高呈现向北倾斜的结构。
英文摘要:
      Based on the high-altitude detection data, conventional ground data and ERA-interim 0.25°×0.25° reanalysis data, the diagnosis and analysis of mountain-climbing gale weather events affecting the southern slope of Tianshan Mountain on May 7 and 20, 2018 were carried out. The results show that the meridional circulation of 500 hPa with two ridge and one troughs is the background of two gales, and Cold trough in northeast-southwest direction,300hPa high-altitude jet, low-altitude jet, Lake Balkash cold high and thermal low pressure in South Xinjiang Basin are the main influencing systems; the downhill effect caused by strong horizontal pressure gradient and topography is the main reason; the strong cold advection in the middle troposphere invades the South Xinjiang is the cause of gales. The important thermodynamic conditions of the weather; the strongest period of gale corresponds well with the appearance time and maintenance time of meridional vertical circulation. During gale period, there is strong frontogenesis near 500-800hPa in Tianshan Mountains, and the structure inclines northward from low to high.
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