The wet scavenging of air pollutants through artificial precipitation enhancement: A case study in the Yangtze River Delta
The wet scavenging of air pollutants through artificial precipitation enhancement: A case study in the Yangtze River Delta
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DOI：
10.3389/fenvs.2022.1027902
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Yixuan Wu;Yuying Wang;Yuquan Zhou;Xiaoli Liu;Yahui Tang;Yuxiang Wang;Rui Zhang;Zhanqing Li
中科院分区：
文献类型：
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作者：
Yixuan Wu;Yuying Wang;Yuquan Zhou;Xiaoli Liu;Yahui Tang;Yuxiang Wang;Rui Zhang;Zhanqing Li
本研究以2020年11月1日中国长三角地区的一次飞机增雨作业为例，考察了人工增雨作业对大气污染物湿清除的影响。利用区域气象、环境资料和南京信息工程大学校园综合观测资料，进行了多方面的观测。结果表明，此次行动的影响范围包括安徽和江苏两省的部分地区。目标区与对照区的降水量之比始终大于1，表明播银的人工增雨作业是有效的。区域大气污染物分析表明，降水的增加对大气污染物尤其是颗粒物的增加有一定的抑制作用。降水增加对区域痕量气体的影响是复杂的，因为它们很容易受到一次排放的影响。NUIST的更多数据分析表明，降水前出现两个云层，降水期间合并为一个厚云层，可能是由于催化操作对上层云层的影响。降水后，直径小于300 nm的气溶胶数浓度明显降低，空气动力学直径小于2.5 μm的颗粒物质量浓度降低约39%，二氧化氮、二氧化硫、一氧化碳质量浓度也有不同程度的降低。结果表明，人工增雨对减少大气污染物是有效的。今后还需要更多的研究。
In this study, the impact of artificial precipitation enhancement operation on the wet scavenging of air pollutants is investigated based on an aircraft precipitation enhancement operation in the Yangtze River Delta region of China on 1 November 2020. Multiple measurement data are used, including the regional meteorological and environmental data and the comprehensive field observation data at the Nanjing University of Information Science and Technology (NUIST) campus site. The results show that the affected areas of this operation cover part of Anhui and Jiangsu provinces. The precipitation ratio between the target and contrast areas is always greater than 1, indicating the effectiveness of the seeding operation of silver iodide for precipitation enhancement. The regional analysis of air pollutants suggests that the enhanced precipitation can prevent the increase of air pollutants, especially for the particulate matter. The impact of enhanced precipitation on regional trace gases is complex because they are easily affected by the primary emissions. More data analysis at NUIST indicates that two cloud layers appear before the precipitation and merge into one thick cloud layer during the precipitation likely due to the impact of catalysis operation on the upper cloud. After the precipitation, the number concentration of aerosols with a diameter lower than 300 nm reduces significantly, the mass concentration of particulate matter with an aerodynamic diameter less than 2.5 μm decreases by about 39%, and the mass concentrations of nitrogen dioxide, sulfur dioxide, and carbon monoxide also decrease in different degrees. These results indicate that it is effective to reduce air pollutants by artificial precipitation enhancement. More studies are needed in the future.