为了分析沙尘天气局地源地表风蚀起尘量与外来源传输路径,针对中国现在沙尘起尘量化的欠缺,应用一次事件的风侵蚀评估模型(SWEEP)来计算天津一次典型沙尘污染事件局地源的总损失量、蠕移+跃移量、悬移量与PM10的量,结合HYSPLIT模型对天津市进行外来源空气颗粒物的轨迹模拟,并分析了空气颗粒物的输送特征。结果表明:在2013年3月9日,天津市郊区12个区县中塘沽单位地块和总起尘量都最大,主要是风速大所致。悬移量在总损失量中比例最大,为85.19%。空气颗粒物的传输路径主要有中国的内蒙古,且当沙尘严重时,不同高度运动轨迹趋于一致。
Due to the lack of quantification analysis of sand-dust in China, this study aims to analyze dust fluxes of the wind erosion of soil from local source and transmission path of long-transportation sources. Single-event Wind Erosion Evaluation Program(SWEEP) is used to analyze local source and calculate total loss fluxes, creep and saltation fluxes, suspension fluxes and PM10 fluxes of a typical sand-dust pollution accident on March 9, 2013 in Tianjin. Combined with Hybrid Single Particle Lagrangian Integrated Trajectory Model(HYSPLIT), the study simulates trajectories of airborne particles and analyzes transport characteristics of airborne particles process of long-transportation sources in Tianjin. The results show that maximum dust emission fluxes of per block and total emission fluxes occur in Tanggu district, one of the twelve suburb districts of Tianjin on March 9,2013, mainly because of the strong speed. Suspension fluxes account for 85.19%, which are the largest proportion of total loss fluxes. Inner Mongolia is the main transmission path of airborne particles. Movement trajectories of different heights tend to be consistent especially when the sand-dust is serious.
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