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https://doi.org/10.5194/acp-2019-1083
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1083
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Feb 2020

Submitted as: research article | 12 Feb 2020

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This preprint is currently under review for the journal ACP.

MICS-Asia III: Multi-model comparison of reactive Nitrogen deposition over China

Baozhu Ge1,2, Syuichi Itahashi3, Keiichi Sato4, Danhui Xu1,5, Junhua Wang1,5, Fan Fan6, Qixin Tan1,5, Joshua S. Fu7, Xuemei Wang8, Kazuyo Yamaji9, Tatsuya Nagashima10, Jie Li1,2,5, Mizuo Kajino11,12, Hong Liao13, Meigen Zhang1,2,5, Zhe Wang1,2,14, Meng Li15, Jung-Hun Woo16, Jun-ichi Kurokawa17, Yuepen Pan1, Qizhong Wu18, Xuejun Liu19, and Zifa Wang1,2,5 Baozhu Ge et al.
  • 1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing 100029, China
  • 2Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences (CAS), Xiamen 361021, China
  • 3Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Abiko, Chiba 270–1194, Japan
  • 4Asia Center for Air Pollution Research (ACAP), 1182 Sowa, Nishi-ku, Niigata, Niigata 950-2144, Japan
  • 5Collage of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
  • 6Nanjing Intelligent Environmental Sci-Tech Co., Ltd., Nanjing, 211800, China
  • 7Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA
  • 8Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, China
  • 9Graduate School of Maritime Sciences, Kobe University, Kobe, Hyogo 658–0022, Japan
  • 10National Institute for Environmental Studies (NIES), Tsukuba, Ibaraki 305–8506, Japan
  • 11Meteorological Research Institute (MRI), Tsukuba, Ibaraki 305–8506, Japan
  • 12Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305–8506, Japan
  • 13School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 14Research Institute for Applied Mechanics (RIAM), Kyushu Univeristy, Kasuga, Fukuoka 816–8580, Japan
  • 15Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China
  • 16Division of Interdisciplinary Studies, Department of Advance Technology Fusion, Konkuk University, Seoul, 303-804, Korea
  • 17Asia Center for Air Pollution Research (ACAP), 1182 Sowa, Nishi-ku, Niigata, Niigata 950-2144, Japan
  • 18College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
  • 19College of Resources & Environmental Sciences, China Agricultural University, Beijing 100193, China

Abstract. Atmospheric nitrogen deposition in China has attracted huge public attention in recently years due to the increasing anthropogenic emission of reactive nitrogen (Nr) and its impacts on the terrestrial and aquatic ecosystems. However, limited long-term and multi-site measurements have restrained the understanding on the mechanism of the Nr deposition as well as the chemical transport model (CTM) improvement. In this study, the performance of the simulated wet and dry deposition for different Nr species, i.e., particulate NO3 and NH4+, gaseous NOx, HNO3 and NH3, have been conducted using the framework of Model Inter-Comparison Study for Asia (MICS-Asia) phase III. Nine Models, including 5 WRF-CAMQ models, 2 self-developed regional models, a global model and a RAMS-CMAQ model, have been selected for the comparison. For wet depositions, observation data from 83 measurement sites of EANET, CREN, CAUDN, NADMN and DEE of China have been collected and normalized to compare with model results. In general, most models showed the consistent spatial and temporal variation of both oxidized N (Nox) and reduced N (Nrd) wet depositions in China with the NME around at 50 %, which is lower than the value of 70 % based on EANET observation over Asia. Both the ratio of wet or dry deposition to the total inorganic N deposition (TIN) and the ratios of TIN to their emissions have shown the consistent results with the NNDMN estimations. The performance of ensemble results (ENM) was further assessed with the measurement from satellite. In different regions of China, the results showed that the simulated Nox wet deposition was overestimated in North East China (NE) but underestimated in south of China (SE+SW), while the Nrd wet deposition was underpredicted in all regions by all models. The deposition of Nox have large uncertainties than the Nrd especially in North China (NC), indicating chemical reaction process is one of the most importance factors that affecting the model performance. Compared to Critical load (CL) value, the Nr deposition in NC, SE and SW reached or exceeded the reported CL value and exerted serious ecological impacts. The control of Nrd in NC and SW and Nox in SE would be effective to mitigate the TIN deposition in these regions. More interestingly, the Nr deposition in Tibet plateau with the high ratio of TIN/emission (~3.0), indicating a significant import from outside should be focused in the future due to its climatical influence to the sensitive ecosystem in whole China.

Baozhu Ge et al.

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Short summary
The performances of the simulated deposition for different Nr species in China have been conducted under MICS-Asia III. The results showed that the simulated wet deposition of oxidized N was overestimated in North East China but underestimated in south of China, while the reduced N was underpredicted in all regions by all models. The oxidized N have large uncertainties than the reduced N, indicating chemical reaction process is one of the most importance factors affecting the model performance.
The performances of the simulated deposition for different Nr species in China have been...
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