| 秦皇岛市两次极端最低气温天气过程的对比分析 |
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| 引用本文： | 燕成玉,闵锦忠,崔粉娥,张宝贵.秦皇岛市两次极端最低气温天气过程的对比分析[J].气象与环境学报,2010,26(3):39-43. |
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| 作者姓名： | 燕成玉 闵锦忠 崔粉娥 张宝贵 |
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| 作者单位： | 1. 南京信息工程大学，江苏 南京 210044;2. 秦皇岛市气象局，河北 秦皇岛 066001 |
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| 摘 要： | 利用MICAPS资料和NCEP(1°×1°)再分析资料,对秦皇岛市2001年1月15日和2010年1月6日两次最低气温极值天气过程,从环流形势、物理量场的垂直结构、温度方程的平流项、垂直项与非绝热项等进行了综合对比分析。结果表明:两次过程环流形势基本相似,均自西北路径直接影响华北,冷平流由水平方向移动并在垂直方向下传;通过对局地温度变化中各项因子的定量估算,发现当空气干燥且从低到高空均为下沉气流时,下沉增温的影响不容忽视;2010年1月6日出现的最低气温极值主要是非绝热因子影响。2010年1月3—4日秦皇岛降暴雪,积雪深度在10 cm以上,2010年1月6日非绝热项为-0.907℃.h-1,2001年1月15日非绝热项为-0.301℃.h-1,下垫面性质的改变对局地气温的影响可为最低气温预报提供参考。
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| 关 键 词： | 极端最低气温天气过程 对比分析 定量估算 局地温度 |
| 收稿时间： | 2010-2-8 |
| 修稿时间： | 2010-4-23 |
Comparison on weather processes of two extreme minimum temperatures in Qinhuangdao,Hebei province |
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| YAN Cheng-yu,MIN Jin-zhong,CUI Fe-e,ZHANG Bao-gui.Comparison on weather processes of two extreme minimum temperatures in Qinhuangdao,Hebei province[J].Journal of Meteorology and Environment,2010,26(3):39-43. |
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| Authors: | YAN Cheng-yu MIN Jin-zhong CUI Fe-e ZHANG Bao-gui |
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| Institution: | 1. Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Qinhuangdao Meteorological Bureau, Qinhuangdao 066000, China |
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| Abstract: | Based on MICAPS data and NCEP (1°×1°) reanalysis data, the weather backgrounds of two extreme minimum temperatures (January 15, 2010 and January 6, 2010) were analyzed, including circulation situations, the vertical structure of physical quantity field, advection term and vertical term as well as non-adiabatic term of temperature equation etc.. The results indicate that the circulation situations of two processes are similar, and both also impact directly North China from the northwest. Cold advection moves horizontally and descends vertically. According to quantitative evaluation of various factors of the local temperature, the effect of increasing temperature does not ignore when air is dry and downward airflow is prevailing from lower level to high level. The extreme minimum temperature on January 6, 2010 is mainly influenced by non-adiabatic factors. Snowstorm happens on January 3-4, 2010 in Qinhuangdao, and depth of snow cover is above 10 cm. Non-adiabatic terms on January 6 and January 15, 2010 are -0.907°C•h-1 and -0.301°C•h-1, respectively. The changes of underlying surface could influence the local temperature, which could provide references for the minimum temperature forecast. |
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| Keywords: | Weather process of extreme minimum temperature Comparative analysis Quantitative estimation Local temperature |
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