三明市PM10浓度突变及影响因子

Influencing Factors of Mutation Characteristics of PM10 in Sanming

利用2004—2007年三明市主要大气污染物PM10的监测值及气象因子(气压、风速、温度、湿度、降水、蒸发量)观测资料,以及同期08:00 850 hPa天气图资料,定量分析了PM10的突变特征以及突变与气象因子的相关关系。结果表明:PM10突变事件有明显的季节性特征,冬、春季节发生突变的概率较大;当地面气象要素场出现气压下降、风速减小、相对湿度下降、降水量减小而温度上升、蒸发量加大的配置时,PM10易发生正突变,当出现气压上升、风速加大、相对湿度上升、降水量增加而温度下降、蒸发量减小的配置时,PM10易发生负突变;当受大陆高压后部、暖区辐合系统影响时,PM10发生正突变的概率较高,受大陆高压前部、切变线系统影响时,PM10发生负突变的概率较高。

Based on the daily data of PM10 at Sanming,the synchronous data of meteorological elements （pressure,wind speed,temperature,humidity,precipitation,evaporation,etc.） and the synoptic chart data at 08：00 850 hPa from 2004 to 2007,the mutation characteristics of PM10 and the relation between mutation processes of PM10 and meteorological conditions are quantitatively analyzed.The results show that there were some evident seasonal characteristics in mutation events of PM10,and the probability of mutation was greater in winter and spring than those in summer and autumn;when surface pressure fell, wind speed decreased,relative humidity decreased,precipitation reduced,temperature and evaporation increased,it was more likely for PM 10 to have positive mutation;when surface pressure went up,wind speed rose,relative humidity and precipitation increased,temperature and evaporation decreasesd,it was more likely for PM 10 to have negative mutation;PM 10 was easier to have positive mutations when influenced by the posterior of a continental high pressure or the warm sector of a convergence system;it was easier to have negative mutations while influenced by the anterior of a continental high pressure or a shear line.