| 摘要: |
| 利用常规气象观测资料、物理量场和历史资料等对2016年1月22～26日发生在云南的一次低温雨雪天气过程进行了综合分析，并选取1983年12月强寒潮过程与之相对比，进一步了解寒潮天气过程的成因及预报重点，结果表明：500hPa上中高纬度的横槽转竖，强冷平流与南支槽前的暖湿气流相交汇，配合700hPa切变线及地面冷锋的推动，形成了此次自东北向西南的低温雨雪天气；通过对比可以看出，冬季的寒潮天气过程的环流形势大致相似，但强度不同；降温幅度与冷空气强度正相关，而极端低温和雨雪天气的分布情况则还需要考虑前期温度的高低、前期的降水情况以及后期的天空状况；除此而外，发现700hPa的0℃线可以作为判断滇中及其以东地区降水形态转换的指标。 |
| 关键词: 寒潮; 环流形势; 对比分析; 降雪; 极端低温 |
| DOI： |
| 投稿时间：2018-08-22修订日期：2018-12-09 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
|
| Analysis of the strong cold wave process in Yunnan on 22-26 January 2016 |
| Qianyuan Yang,Suyu Yang,Xiunian Zhang,Yating Pan |
| (Yunnan Meteorological Observatory Kunming;Kunming Meteorological observational station,Kunming) |
| Abstract: |
| Based on the conventional meteorological data, physical quantity fields and thehistorical climate data, a strong cold wave process with snowfall weather in Yunnan on 22-26 January 2016 is analyzed comprehensively, accompanied by using contrastive analysis with a strong cold wave process occurred in December 1983，in order to realize the causes of strong cold wave process and predictors. The results show that the snow and rain weather was caused by two factors. Firstly, the 500hPa horizontal trough in the middle-high latitude zone moved eastward and turned vertically. Secondly, the strong cold advection carried by northerly flow after the though met the warm air in front of the south branch trough, which coordinated the promotion of a shear line in 700hPa and surface cold front. The comparison results showed: strong cold wave processes had similar circulation type and different intensity; The scale of drop in temperature had positive correlation with the intensity of cold air, extreme low temperature and the distribution of the snow and rain weather were closely related to the temperature values、precipitation before the weather process and the changes of weather situation. The temperature lines with 0°C in 700hPa could be served as an index to determine the conversion of the phase state for precipitation in central and eastern parts of Yunnan. |
| Key words: cold wave; circulation pattern; comparative analysis; snowfall; extreme Slow temperature |
