【摘要】 用2003—2005年宣城市环境保护监测中心PM₁₀、NO₂、SO₂自动监测资料、宣城市气象台地面观测资料和美国NCEP/NCAR全球日平均再分析资料,分析了宣城市区空气污染浓度、典型大气持续高污染过程形成的气象条件。结果表明.PM₁₀、SO₂平均浓度从春季到冬季逐渐增大,NO₂平均浓度冬季明显偏小;PM₁₀I、NO₂、SO₂浓度存在准12 d周期变化。典型大气持续高污染过程的环流形势是500 hPa沿海为低槽.槽后为弱冷平流区;地面为宽广的均压区。1 000～925 hPa主要为下沉气流;且上层增温明显大于低层.气层稳定度增大,这两种因素均使污染物扩散受阻;1 000～700 hPa各层风力微弱.不能将污染物输送至远处,造成污染大气长时间维持。更多还原

【Abstract】 In this paper,based on the meteorological data,PM₁₀,NO₂,SO₂ in Xuancheng,and the NCEP/NCAR reanalysis data from 2003 to 2005,the atmospheric contamination in Xuancheng and the me- teorological conditions,which lead to serious and persistent atmospheric contamination,are analyzed.The results showed that average density of PM₁₀,SO₂ has been gradually increased from spring to winter,aver- age density of NO₂ obviously tends to be minor in winter.The periodic density changes of PM₁₀,NO₂,SO₂ are 12 d.The circulation feature about typical atmospheric contamination is given.更多还原