Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-161
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
29 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
OMI measured increasing SO2 emissions due to energy industry expansion and relocation in Northwestern China
Zaili Ling1, Tao Huang1, Yuan Zhao1, Jixiang Li1, Xiaodong Zhang1, Jinxiang Wang1, Lulu Lian1, Xiaoxuan Mao1, Hong Gao1, and Jianmin Ma1,2,3 1Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, P. R. China
2Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
3CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China
Abstract. The rapid economy growth makes China the largest energy consumer and sulphur dioxide (SO2) emitter in the world. In this study, we estimated the trends and step changes in the planetary boundary layer (PBL) vertical column density (VCD) of SO2 from 2005 to 2015 over China measured by the Ozone Monitoring Instrument (OMI). We show that these trends and step change years coincide with the effective date and period of the national strategy for energy development and relocation in northwestern China and the regulations in the reduction of SO2 emissions. Under the national regulations in the reduction SO2 emissions in eastern and southern China, SO2 VCD in the Pearl River Delta (PRD) of southern China exhibited the largest decline during 2005–2015 at a rate of −7 % yr-1, followed by the North China Plain (NCP) (−6.7 % yr-1), Sichuan Basin (−6.3 % yr-1), and Yangtze River Delta (YRD) (−6 % yr-1), respectively. The Mann–Kendall (MK) test reveals the step change points of declining SO2 VCD in 2009 for the PRD and 2012–2013 for eastern China responding to the implementation of SO2 control regulation in these regions. In contrast, the MK test and regression analysis also revealed increasing trends of SO2 VCD in northwestern China, particularly for several "hot spots" featured by growing SO2 VCD in those large-scale energy industry parks in northwestern China. The enhanced SO2 VCD is potentially attributable to increasing SO2 emissions due to the development of large-scale energy industry bases in energy-abundant northwestern China under the national strategy for the energy safety of China in the 21st century. We show that these large-scale energy industry bases could overwhelm the trends and changes in provincial total SO2 emissions in northwestern China and contributed increasingly to the national total SO2 emission in China. Given that northwestern China is more ecologically fragile and uniquely susceptible to atmospheric pollution as compared with the rest of China, increasing SO2 emissions in this part of China should not be overlooked and merit scientific research.

Citation: Ling, Z., Huang, T., Zhao, Y., Li, J., Zhang, X., Wang, J., Lian, L., Mao, X., Gao, H., and Ma, J.: OMI measured increasing SO2 emissions due to energy industry expansion and relocation in Northwestern China, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-161, in review, 2017.
Zaili Ling et al.
Zaili Ling et al.
Zaili Ling et al.

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Short summary
This paper assesses OMI measured SO2 levels and emission burdens in northwestern China over the last decade. In contrast to widespread decline of SO2 in eastern and southern China, the OMI remote sensing data reveal increasing SO2 level and emissions in energy abundant northwestern China under the national energy relocation strategy to this part of China which are mostly from large-scale energy industry parks in northwestern China and posing threat to local poor ecological environment.
This paper assesses OMI measured SO2 levels and emission burdens in northwestern China over the...
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