頁籤選單縮合
題名 | Influences of the Long-Range Transport of Biomass-Burning Pollutants on Surface Air Quality during 7-SEAS Field Campaigns= |
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作者 | Lin, Cheng-chih; Chen, Wei-nai; Loftus, Adrian M.; Lin, Chuan-yao; Fu, Yen-ta; Peng, Chi-ming; Yen, Ming-cheng; |
期刊 | Aerosol and Air Quality Research |
出版日期 | 20171000 |
卷期 | 17:10 2017.10[民106.10] |
頁次 | 頁2595-2607 |
分類號 | 328.2 |
語文 | eng |
關鍵詞 | Cold surge; Lidar observation; Subsidence; Upper level short wave trough; 2013 BASELInE; |
英文摘要 | 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/Biomassburning 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. |
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