Cheng-Chih Lin1,2, Wei-Nai Chen3, Adrian M. Loftus4,5, Chuan-Yao Lin3, Yen-Ta Fu1, Chi-Ming Peng6, Ming-Cheng Yen 1

  • 1 Department of Atmospheric Sciences, National Central University, Chung-Li 32001, Taiwan
  • 2 Department of Military Meteorology, Air Force Institute of Technology, Kaohsiung 82047, Taiwan
  • 3 Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan
  • 4 Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, USA
  • 5 NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • 6 WeatherRisk Explore Inc., Taipei 10410, Taiwan

Received: August 17, 2017
Revised: August 29, 2017
Accepted: August 30, 2017
Download Citation: ||https://doi.org/10.4209/aaqr.2017.08.0273 

  • Download: PDF


Cite this article:
Lin, C.C., Chen, W.N., Loftus, A.M., Lin, C.Y., Fu, Y.T., Peng, C.M. and Yen, M.C. (2017). Influences of the Long-Range Transport of Biomass-Burning Pollutants on Surface Air Quality during 7-SEAS Field Campaigns. Aerosol Air Qual. Res. 17: 2595-2607. https://doi.org/10.4209/aaqr.2017.08.0273


HIGHLIGHTS

  • The upper level short wave activities were significantly active during 2013 spring.
  • The sinking motion behind short wave trough enhanced the subsidence of cold surge.
  • The particle depolarization Lidar could directly observe this phenomena.
  • The 7-SEAS dual-field-experiments design contributes to this interesting finding.

 

ABSTRACT


The transport of aerosols relies primarily upon air flow for conveyance; however, the air flow pattern is dominated by large-scale circulation conditions. One mission of the 2013 7-SEAS/BASELInE (Seven SouthEast Asian Studies/Biomass-burning Aerosols & Stratocumulus Environment: Lifecycles and Interactions Experiment) was to capture/confirm the downwind effect on the surface air quality due to the long-range transport of Southeast Asia biomass-burning (SEA BB) pollutants. This phenomenon was first discovered during the 2010 Dongsha experiment and directly observed by a lidar system at Hengchun in southern Taiwan during 7-SEAS/BASELInE. Through three-dimensional structural analysis, it was found that the sinking motion behind the upper-level active short wave trough is the major mechanism that enhances subsidence along the cold surge leading edge. In turn, the enhanced subsidence could bring the long-range transport of the SEA BB pollutants down to the surface. Furthermore, the HYSPLIT backward air trajectories helped identify the SEA BB pollutants in the mid-troposphere, while the fine-resolution WRF model simulation combined with dual-polarization lidar observations demonstrated the evolution of the brought-down aerosols process. An additional significant finding of this study is that the upper-level ridge-trough short wave within 20°–35°N was very active during spring 2013, highlighting the inter-annual variability of the long-range transport of SEA BB pollutants.


Keywords: Cold surge; Lidar observation; Subsidence; Upper level short wave trough; 2013 BASELInE


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