| Haze has detrimental impact on the image of the city, the environment and human health. While its occurrence is closely related to weather conditions, therefore, it is necessary to investigate the meteorological causes of its formation, which also provide scientific basis for the prediction of haze in Liuzhou City. Meteorological data of ground observation station from Liuzhou Meteorological Bureau were directly used in this paper to count the probability of haze in Liuzhou City from 2002 to 2012 years. At the same time, various weather conditions and weather factors closely related to haze occurrence were also identified and analyzed. The analysis results show:from the beginning of 2002, haze weather appears the frequency increased dramatically and adverse weather situation and pollutants related to more general haze days; occurs when the relative humidity is from 60 to 69%; a necessary condition of lower wind speed and wind direction is unfavorable haze occur; weather situation and less stabilized the smaller wind speed, air flow convergence or divergence smaller on haze formation is more favorable. Specifically, when Liuzhou City PMio exceeds the limit, and the air humidity in 60～69%,0～2m/s, wind speed, wind direction for the northeast wind, haze is easy to form, in addition, a saddle shaped field, weak cold high pressure and high-pressure back these kinds of weather situation are the typical situation in Liuzhou haze days. The cleaning process of haze is mainly controlled by the subtropical high ridge, cold weather system. Forecast of the haze in Liuzhou City might consider the results of the above analysis of meteorological factors, meteorological conditions and weather situation, which might provide the foundation and basis of haze early warning. |
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