Effect Analysis of Artificial Haze Dispersal Based on Aerosol Lidar
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Abstract:
With the economic and social development of Shihezi, especially the continuous advancement of industrialization, the pollution weather caused by the haze weather in Shihezi occurs frequently in winter. The heavy pollution weather caused by the haze in winter in 2019 has exceeded 50 days, and the ambient air quality has been deteriorating. In this paper, an analysis is made to investigate the impact of artificial smog dispersal in Shihezi, north of Tianshan Mountain, using the data of extinction coefficient observed by the aerosol lidar in Shihezi in December 2019. The methods mainly adopt the physical statistical test method of weather modification, such as the sign test, pairwise rank sum test of inspection, nonparametric tests, and parametric t-test. The smog reduction effect is obtained based on the extinction coefficient of aerosol lidar. In addition, the ground station monitoring cannot obtain the vertical distribution characteristics and evolution law of pollution. At present, most scholars use aerosol lidar to fill this monitoring gap and realize three-dimensional monitoring of the pollution process. The results are as follows: 20 minutes after the artificial smog dispersal operation, the reliability of the reduction of the average extinction coefficient at different heights below 400 m is 99.5%. Further, according to the 95% confidence threshold, the reduction value is 0.05, and the reduction rate is 9.8%. The reliability of the positive effect obtained by the pairwise rank sum test is 97.5%, which is very significant. However, the reliability of the positive effect obtained by the parametric t-test is only 90% to 80%, which does not reach the threshold of 99.5%, indicating a general significance. This is related to the fact that different types of catalysts are used in operation, such as only hygroscopic dry powder catalyst, and that the variation effect of extinction coefficient as samples cannot meet the test efficiency due to the high seeding height. Further analysis shows that the response effect of reducing the extinction coefficient at different heights below 400 meters decreases from top to bottom 20 minutes after the aircraft’s manual haze reduction operation, which is consistent with the gradual response process of the physical mechanism of the catalyst effect that artificially affects the operation seeding from top to bottom. In China, meteorologists have used weather modification to improve the quality of ambient air. In terms of this paper, the weather modification technology is used to carry out the winter haze reduction test in Shihezi. In the course of the test, the extinction coefficient detected by aerosol lidar is utilized to preliminarily analyze the test effect, which is the first time in China.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.