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https://doi.org/10.5194/acp-2017-770
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2017-770
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 28 Sep 2017

Submitted as: research article | 28 Sep 2017

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This preprint was under review for the journal ACP but the revision was not accepted.

Effect assessment of NOx and SO2 control policies on acid species in precipitation from 2005 to 2016 in China based on satellite monitoring

Xiuying Zhang1, Dongmei Chen2,3, Lei Liu1,4, Limin Zhao1, and Wuting Zhang1 Xiuying Zhang et al.
  • 1International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
  • 2Department of Geography and Planning, Queen's University, Kingston, ONK7L 3N6, Canada
  • 3School of Geography and Remote Sensing, Nanjing University of Information Science & Technology, Nanjing, China
  • 4Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China

Abstract. The effects of NOx and SO2 policies on acid species in precipitation was assessed in China from 2005 to 2016, based on the OMI measured SO2 and NO2 columns. The results showed that the SO2 and NO2 columns in the atmospheric boundary layer (ABL) could be used to indicate the variations of S / N in precipitations (R = 0.90, incept = 0.97, P < 0.05). The spatial distribution of S / N was lower in eastern China than the west, which had a negative logarithmic relationship with population densities (R = 0.78, P < 0.05). The OMI-derived S / N decreased significantly from 2005 to 2016 (17.21 and 10.70 in 2005 and 2016, respectively), mainly due to the controlling S and N policies enacted at different times. The ABL SO2 columns showed a decreasing trend from 2005 to 2016, while NO2 presented an increasing tendency from 2005 to 2011 then decreasing until 2016. The temporal variations of SO2 and NO2 were not only determined by their emissions but also affected by precipitation amount, which induced the highest SO2 and NO2 concentrations in 2011 during the study time. With the combined acidification effects of S and N, the acidity had increased from 2005 to 2011, then decreased until 2016. The acidity in 2016 has declined 11.0 % and 25.4 %, respectively, compared with those in 2005 and 2011, indicating the policies on joint controlling SO2 and NO2 had some effects.

Xiuying Zhang et al.

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Xiuying Zhang et al.

Xiuying Zhang et al.

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Short summary
This study might be the first time to evaluate the effects of NOx and SO2 policies on acid species in precipitation in China from 2005 to 2016 on a nation scale, based on the remotely sensed data. The ratio of S to N decrease from 2005 to 2016, while the potential acidity increase from 2005 to 2011, then decrease until 2016. This study confirms that the only controlling SO2 emissions might not be an effect way to decrease acid rain pollution, but the joint controlling SO2 and NO2 does.
This study might be the first time to evaluate the effects of NOx and SO2 policies on acid...
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