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Discussion papers
https://doi.org/10.5194/acp-2018-917
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-917
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Oct 2018

Research article | 30 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Impacts of climate change and emissions on atmospheric oxidized nitrogen deposition over East Asia

Junxi Zhang1, Yang Gao2,3, L. Ruby Leung4, Kun Luo1, Huan Liu5, Jean-Francois Lamarque6, Jianren Fan1, Xiaohong Yao2,3, Huiwang Gao2,3, and Tatsuya Nagashima7 Junxi Zhang et al.
  • 1State Key Laboratory of Clean Energy, Department of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
  • 2Key Laboratory of Marine Environment and Ecology, Ministry of Education of China, Ocean University of China, Qingdao, Shandong, 266100, China
  • 3Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China
  • 4Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington, 99354, USA
  • 5School of Environment, Tsinghua University, Beijing, 100084, China
  • 6Atmospheric Chemistry and Climate and Global Dynamics Divisions, National Center for Atmospheric Research, Boulder, Colorado, USA
  • 7National Institute for Environmental Studies, Tsukuba, Japan

Abstract. A multi-model ensemble of Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) simulations are used to study the atmospheric oxidized nitrogen (NOy) deposition over East Asia under climate and emission changes projected for the future. Both dry and wet NOy deposition shows significant decreases in the 2100s under RCP 4.5 and RCP 8.5, primarily due to large anthropogenic emission reduction over both land and sea. However, in the near future of the 2030s, both dry and wet NOy deposition increases significantly due to continued increase in emissions. The individual effect of climate or emission changes on dry and wet NOy deposition is also investigated. The impact of climate change on dry NOy deposition is relatively minor, but the effect on wet deposition, primarily caused by changes in precipitation, is much higher. For example, over the East China Sea, wet NOy deposition increases significantly in summer due to climate change by the end of this century under RCP 8.5, which may subsequently enhance marine primary production. Over the coastal seas of China, as the transport of NOy from land becomes weaker due to the decrease of anthropogenic emissions, the effect of ship emission and lightning emission becomes more important. On average, seasonal mean total NOy deposition is projected to be enhanced by 24–48% and 3%–37% over Yellow Sea and East China Sea, respectively, by the end of this century. Therefore, continued control of both anthropogenic emission over land and ship emissions may reduce NOy deposition to the Chinese coastal seas.

Junxi Zhang et al.
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Short summary
The ACCMIP simulations was used to study the NOy deposition over East Asia in future. Both dry/wet NOy deposition shows significant decreases in the 2100s under RCP 4.5/8.5 due to large anthropogenic emission reduction. The changes in climate only yields high effect on the wet deposition primarily linked to changes in precipitation. Over the coastal seas of China, the weaker transport of NOy from land due to the emission reduction infers larger impact from ship and lightning emissions.
The ACCMIP simulations was used to study the NOy deposition over East Asia in future. Both...
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