| 成都市一次灰霾过程的演变特征及其成因分析 |
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| 引用本文： | 李昕翼,杨丰恺,朱育雷,倪长健.成都市一次灰霾过程的演变特征及其成因分析[J].气象与环境学报,2020,36(2):28-33. |
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| 作者姓名： | 李昕翼 杨丰恺 朱育雷 倪长健 |
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| 作者单位： | 1. 成都市气象局, 四川 成都 6111302. 贵州省气象台, 贵州 贵阳 5500023. 成都信息工程 大学大气科学学院, 四川 成都 610225 |
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| 基金项目： | 成都市气象局业务技术研究课题 |
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| 摘 要： | 利用成都市2017年1月14—29日环境监测数据、气象观测数据和激光雷达探测资料,系统分析了对应时段灰霾过程的演变机理。结果表明:该灰霾过程与天气形势的高低空配置有密切关系;气象因子的变化对颗粒物扩散具有重要作用,风速、温度和相对湿度与PM 2.5质量浓度的相关系数分别为-0.36、0.45和0.20;灰霾过程期间混合层高度平均值较低(378 m),呈现出白天高和夜晚低的特征;通过混合层高度与地面颗粒物质量浓度的超前滞后相关性分析表明,混合层高度通过2 h左右可对地面颗粒物的扩散起明显作用(二者相关系数较对应时次的-0.47提升至-0.63),这在一定程度上可对未来数小时的颗粒物质量浓度的演变趋势做出指示。本文研究结果可为当地灰霾过程预警预报及污染防治提供理论依据和研究参考。
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| 关 键 词： | 灰霾 PM 2.5 消光系数 混合层高度 |
| 收稿时间： | 2019-03-08 |
Evolution characteristics and formation mechanism of a hazing process in Chengdu |
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| Xin-yi LI,Feng-kai YANG,Yu-lei ZHU,Chang-jian NI.Evolution characteristics and formation mechanism of a hazing process in Chengdu[J].Journal of Meteorology and Environment,2020,36(2):28-33. |
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| Authors: | Xin-yi LI Feng-kai YANG Yu-lei ZHU Chang-jian NI |
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| Institution: | 1. Chengdu Meteorological Service, Chengdu 611130, China2. Guizhou Meteorological Observatory, Guiyang 550002, China3. College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China |
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| Abstract: | Based on data from the environmental monitoring system, meteorological stations and Lidar stations in Chengdu from January 14 to 28, 2017, the evolution mechanism of a hazing process was analyzed.The results show that the hazing process is closely related to the weather situation.The change in meteorological factors plays an important role in particle diffusion.The correlation coefficients of PM2.5 mass concentration with wind speed, temperature, and relative humidity are -0.36, 0.45 and 0.20, respectively.During the hazing process, the average height of the mixing layer is about 378 m, and it is high in the daytime and low at the night.Trough the correlation analysis between the mixing layer height and the particle mass concentration at the ground in about two hour interval, it shows that the mixing layer height can play a significant role in the diffusion of ground particles.The correlation coefficient increases from -0.47 to -0.63 during the two hour period.This can to some extent indicate the evolution trend of particle mass concentration in the next few hours.In summary, the results obtained in this study can provide a theoretical basis and research reference for the early warning, prediction of local haze process, and pollution prevention and control. |
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| Keywords: | Haze PM2 5 Extinction coefficient Mixing layer height |
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