| 大连地区大雾特征 |
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| 引用本文： | 梁军,张胜军,隋洪起,邹耀仁.大连地区大雾特征[J].应用气象学报,2009,20(1):28-35. |
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| 作者姓名： | 梁军 张胜军 隋洪起 邹耀仁 |
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| 作者单位： | 1.大连市气象台, 大连 116001 |
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| 摘 要： | 选取2007年2月和4月出现在大连及其沿海地区的两次大雾过程, 采用GTS1型数字式探空仪探测资料、常规观测资料和NCEP/NCAR再分析资料, 对其环境场、热力和动力作用等进行诊断分析。结果表明:大雾期间, 中高纬度地区高空纬向暖干气流和对流层中下层西南暖湿气流, 为大雾形成提供了有利的水汽和风场条件。低层大气稳定层结的建立及暖干空气与雾层的上下叠置, 有利于大雾的维持。黄渤海的海温作用使冬季地面冷高压进一步增温变性, 有利于辐射雾形成发展, 使春季的暖气团冷却凝结, 有利于平流冷却雾的生成维持。伴有冷平流东移南下的偏北风是促使持续大雾消散的动力因子。
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| 关 键 词： | 大连地区 大雾 稳定层结 |
| 收稿时间： | 2008-06-10 |
Characteristics of Heavy Fog in Dalian |
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| Liang Jun,Zhang Shengjun,Sui Hongqi and Zou Yaoren.Characteristics of Heavy Fog in Dalian[J].Quarterly Journal of Applied Meteorology,2009,20(1):28-35. |
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| Authors: | Liang Jun Zhang Shengjun Sui Hongqi and Zou Yaoren |
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| Affiliation: | 1.Dalian Meteorological Observatory, Dalian 1160012.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | Two heavy fog processes occurred in February and April, 2007 of Dalian and its coastal area are analyzed using the sounding data from GTS1 digital radiosonde, conventional observation data, and NCEP/NCAR global 1 °×1 ° reanalysis data. The diagnostic analysis of environment and its dynamic and thermodynamic effects on the heavy fog indicates that high level zonal warm and dry airflow at high latitude and southwest warm and moist airflow in mid lower troposphere supply water vapor and wind for the formation of fog. The existence of air steady layer at lower layer and the superposition between fog layer and the warm, dry air are of benefit to the maintenance of heavy fog. Furthermore, sea surface temperature on Yellow Sea and Bohai Sea induces the further warming and transformation of surface cold high in winter, which is favorable to the formation and development of radiation fog. As a result, the warm air mass cools and condenses in spring, which causes maintenance of the advection cooling fog. And the north wind followed by the southeast moving of cold convection is the dynamic factor to dissipate the persistent heavy fog. |
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| Keywords: | Dalian heavy fog inversion layer |
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