海峡西岸沿海城市群大气污染物浓度特征及其与天气形势的关系

Characteristics of atmospheric pollutants and its relationships with synoptic situations over the metropolis in the western coast of Taiwan Strait

将海峡西岸沿海主要城市分成北部、中部和南部3个城市群,分别取其组成城市2006年1月—2010年12月大气污染物(SO2、NO2、PM10)日均浓度的平均值进行时空分布特征分析,结果表明:南部城市群的总体污染水平是最高的,SO2和PM10平均浓度值比中部、北部城市群高,NO2浓度略低于中部城市群;3个城市群主要都以PM10为首要污染物;SO2、NO2、PM10浓度年变化、月变化特征相类似;各城市群大气污染物都没有表现出周末效应;分析不同天气形势对大气污染物浓度的影响,结果表明:变性冷高压、高空槽、暖区辐合3种天气形势为不利于大气污染物扩散的天气型,低涡切变、副热带高压及边缘、台风(热带辐合带)、台风(热带辐合带)外围、冷高压脊5种天气形势为有利于大气污染物扩散的天气型.

The coastal cities in the western region of Taiwan Strait were divided into northern, middle and southern groups. The daily mean mass concentrations of SO2, NO2, and PM10 in constituted cities of the three groups were analyzed from January 2006 to December 2010. The results showed that the overall pollution level of the southern group is the highest. SO2 and PM10 concentrations in the southern group were the highest, while NO2 concentration was slightly lower than the middle group. The analysis indicated that PM10 was the dominant pollutant in all three regions. The annual and monthly variation characteristics of SO2, NO2, and PM10 were similar, and there were no significant weekend effect in all three groups. The influence of different synoptic situations on pollutant concentrations were also analyzed, which showed that the pollutant concentrations were higher during the transformed surface cold high pressure, upper trough, and warm zone convergence, while lower during the low vortex shear, subtropical high, typhoon （intertropical convergence zone）, outskirt of typhoon （intertropical convergence zone） and cold high ridge.