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Discussion papers
https://doi.org/10.5194/acp-2019-62
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-62
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Mar 2019

Submitted as: research article | 04 Mar 2019

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Simulated coordinated impacts of the NAO and El Niño on aerosol concentrations over eastern China

Juan Feng1, Jianping Li1,2, Hong Liao3, and Jianlei Zhu4 Juan Feng et al.
  • 1College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
  • 2Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
  • 3School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, China
  • 4China-ASEAN Environmental Cooperation Center, Beijing, China

Abstract. The high aerosol concentrations (AC) over eastern China have attracted attention from both science and society. Based on the simulations of a chemical transport model using a fixed emissions level, the possible role of the previous autumn North Atlantic Oscillation (NAO) combined with the simultaneous El Niño–South Oscillation (ENSO) on the boreal winter AC over eastern China is investigated. We find that the NAO only manifests its negative impacts on the AC during its negative phase over central China, and a significant positive influence on the distribution of AC is observed over south China only during the warm events of ENSO. The impact of the previous NAO on the AC occurs via an anomalous sea surface temperature tripole pattern by which a teleconnection wave train is induced that results in anomalous convergence over central China. In contrast, the occurrence of ENSO events may induce an anomalous shift in the western Pacific subtropical high and result in anomalous southwesterlies over south China. The anomalous circulations associated with a negative NAO and El Niño are not favorable for the transport of AC and correspond to worsening air conditions. The results highlight that the combined effects of tropical and extratropical systems play considerable role in affecting the boreal winter AC over eastern China.

Juan Feng et al.
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Status: closed
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Juan Feng et al.
Juan Feng et al.
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Short summary
Background climate can affect aerosol concentrations (AC). It is found that when negative NAO is overlapped with El Niño, the anomalous circulations are not favorable for the transportation of aerosol, resulting in enhanced AC over eastern China. By contrast, a sole negative NAO event is linked with increased AC over central China. The results suggest that both the extratropical and tropical climate system play important role in impacting the AC over China.
Background climate can affect aerosol concentrations (AC). It is found that when negative NAO is...
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