| 成都双流机场夏季大雾天气特点及形成机理 |
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| 引用本文： | 杨晶轶.成都双流机场夏季大雾天气特点及形成机理[J].高原山地气象研究,2015,35(4):36-41. |
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| 作者姓名： | 杨晶轶 |
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| 作者单位： | 民航西南空管局气象中心, 成都 610202 |
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| 摘 要： | 利用NCEP 1°×1°再分析资料、成都双流机场自动观测资料,统计分析了2003～2015年双流机场夏季大雾出现时气象要素的特征,并对2003～2015年出现的大雾天气过程进行合成分析,以探寻双流机场夏季大雾的特征和形成机理。结果表明:双流机场夏季大雾均为辐射雾,持续时间较短,风向多为偏南风和西南风,风速较小;大雾发生在降水系统后部的负渦度区内,前期降水为大雾形成提供了充足的水汽条件,前一日20时相对湿度在80%以上,大雾出现时相对湿度在92%以上;在高压系统稳定维持的天气背景下,中高层干空气侵入促使双流机场上空维持上干下湿的结构;下沉气流的存在有利于下沉增温和近地面辐射降温共同形成等温或逆温结构,促进稳定层结的建立,有利于大雾的维持。
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| 关 键 词： | 大雾 统计 合成分析 形成机理 机场 |
| 收稿时间： | 2015-11-20 |
Weather Characteristics and Formation Mechanism of Summer Heavy Fog in Chengdu Shuangliu Airport |
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| Affiliation: | Meteorological Center of Air Traffic Management Bureau of Southwest China, Chengdu 610202, China |
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| Abstract: | Based on the NCEP 1°×1° reanalysis data and automatic observing data of Chengdu Shuangliu airport,characteristics of meteorological elements of summer heavy fog were analyzed statistically. By using the method of composition analysis,the heavy fog events occurred from 2003 to 2015 were also studied. The results show that the summer heavy fog in Chengdu Shuangliu Airport is radiation fog with shorter duration. Southerly and southwesterly wind with low speed is found during the occurrence of heavy fog. The heavy fog occurs in the negative vorticity areas behind precipitation system. The presence of pre- precipitation provides the water vapor for the fog event. The relative humidity is above 80% at 20 o'clock last night,and generally more than 92% when heavy fog occurs. Under stable high- pressure system situation,the invasion of dry air in the middle and high troposphere makes configuration of dry upper- level and wet lower- level maintained in Shuangliu airport. Downdraft benefits subsidence warming in upper air and radiative cooling near the ground,which form isotherm or inversion structure. These all lead to the setting- up of stable stratification,which is favorable for formation of fog. |
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