摘要
利用 2 0 0 0年 6月至 2 0 0 2年 1 2月上海地区空气污染物浓度和地面风向资料 ,统计了月平均污染物浓度随偏西风频率的分布 ,两者具有一致的趋势。首要污染物PM1 0 平均浓度风玫瑰图显示高浓度对应偏西风向的出现 ,各季节均表现出此特性。由于冬、夏半年主导上海地区的天气系统的不同 ,分冬半年和夏半年统计了各污染物浓度日变化随风向日变化的均值和标准差 ,当风向由非西风转为偏西风或连续受偏西风影响时 ,污染物浓度有所上升 ,不同污染物间 ,PM1 0 浓度对地面风向的改变较SO2 和NO2
The relationship between surface wind direction and air pollutant concentration in Shanghai is studied. The same trend in the distribution of the monthly mean concentrations is found as in the frequency of west winds (SSW NNW). The wind rose charts of mean PM 10 concentrations in different seasons are obtained. It indicates that high concentrations usually associate with west winds. Divided into winter half year and summer half year, the averages and standard deviations of the daily variations of pollutant concentrations along with the daily shifts of wind directions are recorded. The daily variations of concentrations increase to some extent when the wind directions shifting from non west to west or under continuous west wind. PM 10 concentration is more sensitive to the shifts of wind direction than those of SO 2 and NO 2.
出处
《气象科技》
北大核心
2003年第6期366-369,共4页
Meteorological Science and Technology
基金
中国气象局"十五"基本建设项目"上海城市环境气象业务服务系统建设"资助
关键词
空气污染
污染物浓度
地面风向
日变化
air pollutant concentration, surface wind direction, distribution
