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Discussion papers
https://doi.org/10.5194/acp-2019-762
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-762
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Nov 2019

Submitted as: research article | 04 Nov 2019

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

Study the impact of three Asian industrial regions on PM2.5 in Taiwan and the process analysis during transport

Ming-Tung Chuang1, Maggie Chel Gee Ooi2, Neng-Huei Lin2, Joshua S. Fu3, Chung-Te Lee4, Sheng-Hsiang Wang2, Ming-Cheng Yen2, Steven Soon-Kai Kong2, and Wei-Syun Huang2 Ming-Tung Chuang et al.
  • 1Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan
  • 2Department of Atmospheric Science, National Central University, Taoyuan, 32001, Taiwan
  • 3Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA
  • 4Graduate Institute of Environmental Engineering, National Central University, Taoyuan, 32001, Taiwan

Abstract. The outflow of East Asian haze (EAH) has gathered much attention in recent years. For downstream areas, it is meaningful to understand the impact of crucial upstream sources and the process analysis during transport. This study evaluated the impact of PM2.5 from the three biggest industrial regions in Asian continent: Bohai Rim industrial region (BRIR), Yangtze River Delta industrial region (YRDIR), and Pearl River Delta industrial region (PRDIR) on Taiwan and discussed the processes during transport with the help of air quality modeling. The simulation results revealed the contributions of monthly average PM2.5 from BRIR and YRDIR were 0.7∼1.1 µg m−3 and 1.2∼1.9 µg m−3 (∼5 % and 7.5 % of total concentration) on Taiwan, respectively in January 2017. When the Asian anticyclone moved from Asian continent to the West Pacific, e.g. on Jan 9th 2017, the contributions from BRIR and YRDIR to northern Taiwan could reach 6∼8 and 9∼12 µg m−3. The transport of EAH from BRIR and YRDIR to low latitude regions was horizontal advection (HADV), vertical advection (ZADV), and vertical diffusion (VDIF) over Bohai Sea and East China Sea. Over Taiwan Strait and northern South China Sea, cloud processes (CLDS) was the major production process of PM2.5 due to high relative humidity environment. Along the transport from high latitude regions to low latitude regions, Aerosol chemistry (AERO) and Dry deposition (DDEP) were the major removal processes. When the EAH intruded northern Taiwan, the major production processes of PM2.5 at northen Taiwan were HADV and AERO. The stronger the EAH was the easier the EAH could influence central and southern Taiwan. Although PRDIR was located at the downstream of Taiwan under northeast wind, the PM2.5 from PRDIR could transport upward above boundary layer and moved eastwards. When the PM2.5 plume moved overhead Taiwan, PM2.5 could transport downward via boundary layer mixing (VDIF) and further enhanced by the passing cold surge. In contrast, for the simulation of July 2017, the influence from three industrial regions was almost negligible unless there was special weather system like thermal lows, which may carried pollutants from PRDIR to Taiwan, but the occurrence was rare.

Ming-Tung Chuang et al.
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Short summary
This study evaluated the impact of Asian haze from the three biggest industrial regions to Taiwan and analyzed the process analysis during transport. The production and removal process revealed the mechanisms of long-range transport. As we know, it is the first time applying the Brute Force method and process analysis technique in CMAQ to do such a study. Also, this study simulated the interesting transboundary transport of pollutants from southern mainland China to Taiwan.
This study evaluated the impact of Asian haze from the three biggest industrial regions to...
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