JpGU-AGU Joint Meeting 2017

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[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS05] [EE] Contributions of local and long-range transport to air pollutants in mega-cities

Thu. May 25, 2017 9:00 AM - 10:30 AM 301A (International Conference Hall 3F)

convener:Hongliang Zhang(Louisiana State University), Jianlin Hu(NUIST Nanjing University of Information Science and Technology), Sri Harsha Kota(Indian Institute of Technology Guwahati), Jia Xing(Tsinghua University), Chairperson:Hongliang Zhang(Louisiana State University), Chairperson:Sri Kota(Indian Institute of Technology Guwahati), Chairperson:Jingyi Li(Nanjing University of Information Science & Technology)

9:45 AM - 10:00 AM

[AAS05-04] Source Tagging Modeling Study of Heavy Haze Episodes under Complex Regional Transport Processes over Wuhan Megacity, Central China

Miaomiao Lu1, *Xiao Tang1, Zifa Wang1, Alex Gbaguidi1, Shengwen Liang, Ke Hu, Lin Wu, Huangjian Wu1, Zhen Huang, Longjiao Shen (1.Institute of Atmospheric Physics, Chinese Academy of Sciences)

Keywords:Regional chemical transport, Wuhan, Central China, Haze pollution, Source tagging method

This study carried on the Nested Air Quality Prediction Modeling System (NAQPMS) coupled with an on-line source-tagging module, aims at delving into the role of regional transport in the occurrence of two strong haze episodes over Wuhan in October 2014 and quantitatively assessing the contributions from potential local and regional sources to PM2.5 concentration. Validation of predictions based on observations shows modeling system good skills in reproducing key meteorological and chemical features. Different types of the regional transport were found to play key roles in the formation of the two haze episodes. The first short-time haze episode occurring on 12 October under strong northerly wind, with hourly PM2.5 concentration maximum of 180μgm-3 is found to be mainly triggered by the long-range transport from the northern regions, contributing to PM2.5 concentration by 60.6% versus a total of 32.7% for Wuhan local and nearby sources. For the second episode extending over 15-20 October under stable regional large-scale synoptic condition and weak winds and with hourly PM2.5 peak of 231.0 μg m-3, both the long-range transport from far regions and the short-range transport from Wuhan Megalopolis are the main causes of the haze episode and account for 24.8% and 29.2% of the PM2.5 concentration respectively. Therefore, the regional transport acts as a crucial driver of haze pollution over Wuhan through not only long-range transfer of pollutants, but also short-range aerosol movement associated with complex interaction and stagnation under specific meteorological conditions. The present findings incontestably call for enhancing enforcement of strategic environmental assessment with commitment of stakeholders at both local and regional scales.