福州市PM10突变特征与气象条件的关系研究

利用2004～2006年福州市PM10逐日资料,及同期地面气象要素资料和08时850 hPa天气图资料,采用统计分析方法,综合分析了PM10发生突变时气象条件的变化特征,结果表明:当地面气象要素场出现气压下降、风速下降、温度上升、相对湿度上升、降水量下降或出现气压上升、风速下降、温度下降、相对湿度下降、降水量下降的配置时PM10易发生正突变;当出现气压上升、风速上升、温度下降、相对湿度维持、降水量上升或出现气压下降、风速上升、温度上升、相对湿度上升、降水量上升的配置时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,受切变线、大陆高压前部系统影响时,PM10发生负突变的概率较高.

THE RELATIONSHIP BETWEEN MUTATION CHARACTERISTICS OF PM10 AND METEOROLOGICAL CONDITIONS IN FUZHOU CITY

Based on the daily data of PM₁₀ for Fuzhou,synchronous data of surface meteorological elements and synoptic chart data of 8 am at 850 hPa from 2004 to 2006 and the variation characteristics of meteorological conditions during the mutation process of PM₁₀ are comprehensively analyzed with statistical analysis methods. The results show that when surface meteorological elements are allocated such that surface pressure falls,wind speed decreases,temperature and relative humidity increase and precipitation reduces,or that surface pressure goes up,wind speed decreases,temperature lowers,relative humidity decreases and precipitation reduces,it is easy for PM₁₀ to have positive mutation. When surface pressure goes up,wind speed rises,temperature lowers,relative humidity remains unchanged and precipitation increases,or when surface pressure falls,wind speed rises,temperature and relative humidity increase and precipitation increases,it is easy for PM₁₀ to have negative mutation. PM₁₀ is more likely to have positive mutations when influenced by the posterior of a continental high pressure or the warm sector of a convergence system; it is more likely to negative mutations while influenced by a shear line or the anterior of a continental high pressure.