Numerical simulation of the impact of intercontinental transmission on tropospheric ozone in China
Lü Xin1, HOU Xue-wei1,2, LU Wen1,2
1. Joint International Research Laboratory of Climate and Environment Change, Key Laboratory of Meteorological Disaster, Ministry of Education, Collaborative Innovation Center On Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Nanjing University of information Science & Technology, Nanjing 210044, China
Abstract：The contribution of tropospheric ozone (O3) transported from North America to China was analyzed quantitatively using MOZART-4 model and the online tagging method. The analysis indicated that the modelled results were consistent with the observations. In summer, the concentrations of near-surface O3 in China that transported from North America and Europe were 0.3×10-9 and 0.6×10-9, respectively, and were both 0.9×10-9 in winter. Concentrations of free-troposphere O3 in China transported from North America exceeded 3.8×10-9 in four seasons, while that from Europe was up to 7.3×10-9 in summer. The reason was that the wintertime downdraft in East Asia could enhance the sinking of O3 to the surface layer in China, regardless of the unfavorable illumination condition. In summer, the production of O3 in troposphere increased dramatically in Europe and North America, but due to the downdraft along the Mediterranean coast, the transportation of O3 from North America and the west coast of Europe was declined, while the impact of the downdraft was weak in Europe. In addition, because of the updraft in summer, the near-surface O3 that came from North America and Europe was reduced. The trajectories simulation using HYSPLIT model indicated that the near-surface air mass in North America could hardly transport to China due to the wintertime downdraft. While for the free-troposphere, 13 trajectories were found from North America to China. The trajectories transported from Europe to China were found at multiple altitudes due to the downdraft in winter. While in summer, because of the downdraft along the Mediterranean coast, no trajectory could transport from North America to China, and the number of trajectories transported from Europe to China reached its annual low.
吕鑫, 侯雪伟, 卢文. 洲际传输对我国对流层臭氧影响的数值模拟[J]. 中国环境科学, 2021, 41(2): 537-547.
Lü Xin, HOU Xue-wei, LU Wen. Numerical simulation of the impact of intercontinental transmission on tropospheric ozone in China. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 537-547.
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