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| Spatial-temporal change of tropospheric NO2 column density and its impact factors over Shandong province during 2005~2014 |
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Abstract 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.
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Received: 20 January 2015
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