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2004年冬季华北平原持续大雾天气的诊断分析
引用本文:康志明,尤红,郭文华,杨克明.2004年冬季华北平原持续大雾天气的诊断分析[J].气象,2005,31(12):51-56.
作者姓名:康志明  尤红  郭文华  杨克明
作者单位:1. 兰州大学大气科学学院,730000;国家气象中心
2. 云南玉溪市气象台
3. 国家气象中心
摘    要:利用GTS1型数字式探空仪探测的资料、NCEP 1°×1°的6小时资料和常规观测资料,对2004年冬季华北平原历史上少见的持续大雾天气进行了天气动力学诊断分析。结果表明:华北平原近地面气层900hPa以下的负涡度平流、冷温度平流和弱辐合上升运动引起该层气温下降,900-500hPa的正涡度平流、暖温度平流和辐散下沉运动造成该层气温升高,在上升和下沉运动区的界面层中形成逆温层,逆温层的高度和强度影响雾的形成和状况。夜间辐射热力强迫作用和950hPa以下的微风是大雾形成的动力因子。大雾边界层中存在的水汽饱和层是在特定的环流形势下华北平原低空盛行东和东南向岸气流,将北部海面的水汽向西向北平流到冷近地面气层中的结果。

关 键 词:大雾天气  诊断分析  逆温层  平流

Diagnostic Analysis of the Long-Drawn Fog over Huabei Plain in 2004
Kang Zhiming,You Hong,Guo Wenhua,Yang Keming.Diagnostic Analysis of the Long-Drawn Fog over Huabei Plain in 2004[J].Meteorological Monthly,2005,31(12):51-56.
Authors:Kang Zhiming  You Hong  Guo Wenhua  Yang Keming
Abstract:Based on the data of GTSI digital radiosonde, NCEP reanalysis data and conventional observation, synoptic analysis of the uncommon long-drawn fog over Huabei plain in the winter of 2004 is made. The result shows that the temperature of layer close to the surface was lowered by negative vorticity advection, cold advection and weak convergence ascending movement below 900hPa, and the temperature of the layer between 900hPa and 500hPa was raised by the positive vorticity advection, warm advection and divergence descending movement, thus the inversion layer is formed in the interface of ascending and descending movement. The height and intensity of the inversion layer could affect on the formation and status of the fog. Radiation cooling during the night and gentle breeze below 950hPa layer are dynamic factors for the formation of fog. Under some synoptic situations, the easterly and southeasterly shoreward wind over Huaibei plain transports the water vapor from northern sea surface to cold land surface layer, and results in the saturation in fog boundary layer.
Keywords:fog diagnostic analysis inversion layer advection
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