兰州市大气臭氧与其前体物及气象因子相关性研究

兰州市在"一带一路"建设中发挥着重要的战略支点作用.基于OMI（ozone monitoring instrument，臭氧层监测仪）数据产品，对2006-2015年兰州市对流层O₃柱浓度与前体物及气象因子的相关性进行研究.结果表明:2006-2015年兰州市对流层O₃柱浓度值与HCHO总柱浓度值均随时间的变化呈先增后减的趋势，对流层NO₂柱浓度值呈逐年递减的趋势；相关性分析得出，对流层O₃柱浓度与HCHO总柱浓度、对流层NO₂柱浓度相关性较高的地区范围呈先增后减的趋势.在敏感控制区上，2006-2015年VOCs敏感控制区从有到无，VOCs-NO_x协同敏感控制区范围逐渐缩小，NO_x敏感控制区范围逐渐扩大；在气象因子上，对流层O₃柱浓度与气温、日照时间呈显著正相关，与气压、降水量呈显著负相关.在偏北风向上，风速为1.7~1.9 m/s时，兰州市大气对流层O₃柱浓度相对较高.研究显示，NO_x排放量的减少能有效降低兰州市对流层O₃柱浓度. 

Correlation between Atmospheric Ozone and Precursor and Meteorological Factors in Lanzhou City

Lanzhou City plays a significant strategic fulcrum role in the 'Belt and Road' Initiative. Therefore, based on the ozone monitoring instrument (OMI) data products, this paper studied the correlation between the ozone column concentration, precursor compounds and meteorological factors in Lanzhou City from 2006 to 2015. The results showed that the column concentration of O₃ in the troposphere and total column concentration of HCHO increased first and then decreased with time, while the column concentration of NO₂ in the troposphere decreased gradually with time. Spatial correlation analysis between the column concentration of O₃ and NO₂ in the troposphere and total column concentration of HCHO showed that the correlation values of the three substances increased first and then decreased. In the view of sensitive control area, the sensitive control zone of VOCs gradually disappeared, and the scope of the VOCs-NO_x coordinated control zone was gradually reduced, while the scope of NO_x sensitive control zones gradually expanded. In terms of the meteorological factors, the column concentration of O₃ in the troposphere had a significantly positive correlation with air temperature and sunlight intensity, while it had a seriously negative correlation with the atmospheric pressure and rainfall. There was a relatively high column concentration of O₃ in the troposphere in Lanzhou City when the wind speed reached 1.7-1.9 m/s and the wind direction was northward. This study shows that the reduction of NO_x emissions can reduce the column concentration of O₃ in the troposphere significantly in Lanzhou City.