Aerosol vertical distribution and sources estimation at a site of the Yangtze River Delta region ...

Aerosol vertical distribution and sources estimation at a site of the Yangtze River Delta region of China

•Long-term vertical distribution of aerosols over the YRD region from 3-years (2013–2015) LiDAR observations.

•LiDAR observations were combined with backward trajectory model.

• PSCF and CWT models were used to investigate aerosol-aloft sources.

气溶胶的垂直分布特征是研究污染物辐射强迫和跨区域运移效应的关键不确定因素。本文利用中国长江三角洲地区三年（2013-2015）LiDAR测量方法，利用潜在源贡献函数（PSCF）和浓度加权来研究气溶胶垂直分布和气溶胶 - 空气输送源。轨迹（CWT）模型。结果表明，在研究期间，共有230天雾霾天占21％，包括142个潮湿的雾天和88个干雾天。2公里以下的气溶胶占气溶胶总光学深度的 89％以上（AOD）。与其他季节相比，冬季气溶胶更可能积聚在1公里以下（> 69％）。在夏季，尽管大气常规强烈导致高行星边界层高度（PBLH）并且PM _2.5的浓度低，但由于高相对湿度导致颗粒的吸湿性生长，AOD最大。由于冬季天气条件稳定，PBLH较低，PM浓度最高因此，雾霾天的发生最为频繁。PSCF和CWT结果显示，高层气溶胶主要来自当地; CWT模型表明，在春，秋，冬季，蒙古，甘肃和新疆维吾尔自治区的中国北方/西北地区的长距离灰尘长距离运输。南方来源在冬季更加明显，可能会产生更多的人为气溶胶和生物量燃烧排放。

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Based on the above-generated backward trajectories, the Potential Source Contribution Function (PSCF) model and the Concentration-Weighted Trajectory (CWT) method were established by using TrajStat software (Wang et al., 2009).

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Wang et al., 2009

Y.Q. Wang, X.Y. Zhang, R.R. DraxlerTrajStat: GIS-based software that uses various trajectory statistical analysis methods to identify potential sources from long-term air pollution measurement data

Environ. Model. Softw., 24 (2009), pp. 938-939

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