关键词: 天津, 静风, 污染物浓度

Abstract: Based on the meteorological data and the pollution data from 2000 to 2004 in Tianjin,the calm wind distribution and the pollutant concentration change were analyzed with statistical analysis method in the city zone of Tianjin.The results indicated that the daily and the yearly changes of calm wind distribution were obvious.Under the weather situation of topographic trough in north China or low pressure,the foreside of high pressure and high pressure,the calm weather occurred easily and its duration was longer.There was a negative correlation between the pollutant concentration and wind speed.That is to say,the larger the wind speed was,the lower the pollutant concentration was.However,when the wind speed reached a certain critical value,the relationship between total suspended particles(TSP) and wind speed was a positive correlation.The stronger wind could result in the second blowing dust and increase the grain contents in the air.The concentrations of PM10,SO2 and NO2 in calm weather were higher than that in non-calm weather.