YANG-CHEN Huizi,ZHANG Yang,LIU Zhihong,et al.The Impact of Meteorological Conditions and Boundary Layer Structure on The PM2.5 Pollution Process in Winter 2023 in Chengdu City[J].Journal of Chengdu University of Information Technology,2025,40(05):722-730.[doi:10.16836/j.cnki.jcuit.2025.05.022]
气象条件和边界层结构对成都市2023年冬季PM2.5污染过程的影响
- Title:
- The Impact of Meteorological Conditions and Boundary Layer Structure on The PM2.5 Pollution Process in Winter 2023 in Chengdu City
- 文章编号:
- 2096-1618(2025)05-0722-09
- Keywords:
- Chengdu City; PM2.5; Circulation situation; boundary layer
- 分类号:
- X513
- 文献标志码:
- A
- 摘要:
- 过量排放的污染物是造成大气污染的根本原因,但不利的气象条件是大气污染的绝对外因。以成都市2023年12月的一次典型PM2.5污染过程为例,采用环境监测站及气象站观测资料,结合数值模拟方法,研究气象条件和边界层结构变化对污染过程的不同阶段的影响。结果表明:(1)成都位于700 hPa低空槽区前部和低涡系统底部时,配合西北、西、偏南风向上的污染物区域传输,易使得PM2.5污染积聚,而偏东风则对污染物清除明显。(2)西南暖湿气流的输送以及气流下沉增温造成的高温高湿状态有利于逆温层的形成,是细颗粒物爆发增长的有利条件。(3)划分贴地逆温(SI)+脱地逆温(EI)、SI+对流层低层逆温(LTI)、EI+LTI、SI+EI+LTI分别对应第Ⅰ、Ⅱ、Ⅲ、Ⅳ类多层逆温。此次过程多层逆温出现频率高,对污染物扩散抑制作用强,尤其是Ⅱ、Ⅳ类。SI和其他逆温共同作用时,会加重PM2.5污染。(4)污染累积期和爆发前期通风系数(VE)均值为593 m2/s,600 m以下风向变化频繁,易使污染物回流。清除期边界层高度最高,VE大于3000 m2/s,局地回流指数在2500 m以下均大于0.8。
- Abstract:
- Excessive emissions of pollutants are the fundamental cause of air pollution,while adverse meteorological conditions are the extrinsic factor.This study examines a typicalPM2.5 pollution event in Chengdu in December 2023,utilizing data from environmental and meteorological stations,combined with numerical simulation methods,to explore the impact of meteorological conditions and boundary layer structure changes on different stages of the pollution process.The findings reveal:(1)When Chengdu is positioned in front of the 700 hPa low trough area and at the bottom of a low vortex system,northwest,west,and southwest wind directions facilitate the regional transport of pollutants,leading to PM2.5 accumulation,whereas easterly winds significantly clear pollutants.(2)The transport of warm and humid airflow from the southwest and the resultant increase in temperature due to air subsidence create conditions conducive to the formation of inversion layers,favoring the explosive growth of fine particulate matter.(3)The classification of surface-based inversion(SI)+ elevated inversion(EI),SI + lower-tropospheric Inversion(LTI),EI + LTI,SI + EI + LTI corresponds to the first,second,third,and fourth types of multi-level inversions.This event exhibited a high frequency of multi-level inversions,significantly inhibiting pollutant dispersion,particularly in the second and fourth types.When SI and other inversions act together,they exacerbate PM2.5 pollution.(4)During the pollution accumulation and pre-outbreak stages,the average ventilation coefficient(VE)is 593 m2/s,with frequent wind direction changes below600 m,facilitating pollutant recirculation.During the clearance stage,the boundary layer reaches its maximum height,with VE exceeding3000 m2/s,and the local recirculation index below 2500 m is greater than 0.8.
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备注/Memo
收稿日期:2024-05-22
基金项目:四川省科技计划资助项目(2023YFS0383); 四川省自然科学基金资助项目(2023NSFSC0745)
通信作者:张洋.E-mail:zhangyang@cuit.edu.cn