“十一五”到“十三五”期间济南市对流层HCHO柱浓度时空变化及影响因素分析

Spatio-temporal Variation and Influencing Factors of Tropospheric HCHO Column Density in Jinan City from the 11th to the 13th Five-Year plan

利用OMI对流层HCHO柱浓度产品研究了2006—2020年济南市HCHO柱浓度时空分布特征,从气象、社会经济、环保政策等方面分析了影响因素。结果表明:对流层HCHO柱浓度波动较大,“十一五”期间基本为下降趋势,“十二五”期间为波动上升的趋势,“十三五”期间为波动下降的趋势;夏季浓度最高,春、秋季次之,冬季最低,最高值基本出现在7、8、9月,最低值基本出现在1、11、12月;南部山区浓度较低,主城区浓度较高;HCHO既有本地排放,也受周边地区影响;月平均降水量、月平均气温与HCHO浓度正相关,气压与HCHO浓度负相关;社会经济发展对HCHO浓度有较大影响,一系列环保法规政策的颁布施行对HCHO浓度下降起到了积极作用。

Using the OMI tropospheric HCHO column density product,the spatio-temporal distribution characteristics of HCHO column density in Jinan for 2006—2020 were studied,as well as its impact factors from the aspects of meteorology,social economy and environmental protection policies.The results demonstrated that tropospheric HCHO column density had a large fluctuation on the temporal scale.A declined trend during the 11th Five-Year Plan period,an increasing trend of fluctuation during the 12th Five-Year Plan period,and a declined trend of fluctuation during the 13th Five-Year Plan period were found.The column density was highest in summer,followed by spring and autumn,and lowest in winter.The highest value appeared in July,August and September;and the lowest value appeared in January,November and December.The column density was lower in the southern mountainous area than that in the main urban area.HCHO had both local emission and surrounding areas.Monthly mean precipitation and temperature were positively correlated with HCHO column density,while barometric pressure was negatively correlated.Social and economic development had a great influence on HCHO column density.The promulgation and implementation of a series of environmental laws and policies had played a positive role in the reduction of HCHO column density.