关键词: 重度污染, 天气分型, 气象条件

Abstract:

The observations from 196 environmental observation stations and meteorological data during 2013-2016 were used to classify weather situation that was prone to occurring heavy pollution in Hebei Province, then six weather types including convergent type, returning flow type, uniform pressure field type, high pressure rear type, northwest high pressure type and north high pressure type were given, among them, the northwest high pressure type appeared most frequently, then followed by uniform pressure field type, while returning flow type occurred least. Based on the statistics of mixed layer height, static stability weather index, breeze days and air pollutant concentration from three representative stations of Hebei Province in autumn and winter during 2014-2016, it was showed that there was a good correlation between air pollution and three indexes, when mixed layer height was lower, the static stability weather index was higher and breeze days was more，there would be more conducive to the formation of air pollution. In addition, through comparing the height of the mixed layer and the static stability weather index under different weather types when heavy pollution occurred, the corresponding relationship between weather types and meteorological characteristic was obtained. The north high pressure type was most stable, while northwest high pressure type was likely to be destroyed.

Key words:  heavy pollution, meteorological classification, weather condition