山东省近10年对流层NO_2柱浓度时空变化及影响因素

Spatial-temporal change of tropospheric NO2 column density and its impact factors over Shandong province during 2005～2014

利用OMI卫星对流层NO2柱浓度产品研究了近10年山东省NO2时空格局及影响因素,结果表明：对流层NO2柱浓度波动较大,10年柱浓度年均值增幅为28.5%,其中2011年浓度最高;对流层NO2柱浓度空间变化显著,2005～2009年四、五级高值仅出现在经济发达的内陆城市,2010～2012年四、五级高值范围显著扩大至中西部大范围地区,尤以2011年最为严重,2013～2014年,四、五级高值范围呈逐步缩小趋势;夏季丰富的降水对NO2具有显著湿沉降作用;山东省近10年地区生产总值不断攀升、机动车保有量大且增幅快、秸秆焚烧火点个数多,这些人为排放是对流层NO2柱浓度升高的主要影响因素。

Based on satellite derived NO2 column data from OMI, we analysed the characteristics of spatial and temporal distribution of tropospheric NO2 column density and its impact factors over Shandong province for 2005-2014. Results demonstrate： Tropospheric NO2 column density had a large fluctuation on the temporal scale, increased at the rate of 28.5%, with the highest column density in the year 2011; The spatial distribution of tropospheric NO2 column density also had significant changes, with variation of the highest value areas, regions with the fourth and fifth level values had extended to a wide range of the central and western part of Shandong province during 2010～2012, which only appeared in developed inland cities during 2005-2009, but narrowed again during 2013-2014; Precipitation had a highly negative correlation with NO2 concentrations, for the reason of atmospheric wet deposition. Through analyzing the significant increasement of regional gross domestic product （GDP）, the large and rapid increasement of vehicle ownership and the significant straw burning in Shandong province during 2005-2014, the change of NO2 columns can be attributed to these anthropogenic sources.