摘要
为更好地研究近年来盆地PM_(25)污染的变化规律,通过分析2021-2022年冬季成都地区一次细颗粒物(PM2.5)污染的变化特征与气象条件关系得出,本次污染过程具有持续时间长(持续21 d),前期日变化不明显,后期污染较前期严重的特点。由于污染过程期间,较强的晴空辐射创造了有利的逆温条件,大气混合层高度较低,垂直方向上的通风能力较弱,使大气稳定不利于污染扩散,同时垂直和水平风场对污染物的输送能力都较弱,使PM_(2.5)逐步积累。进一步依托风廓线雷达观测数据计算局地回流指数(R),发现污染过程后期成都各地区R值逐步增大,水平输送能力逐步增强,前期东南部较好,后期西部较好。
To study the variation regularity of PM_(2.5)pollution in the basin in recent years,the relationship between the variation characteristics of PM_(2.5)pollution and meteorological conditions in the winter of 2021-2022 in the Chengdu area was analyzed,the pollution process has the characteristics of long duration(lasting 21 days),no obvious diurnal variation in the earlier period,and more serious pollution in the later period than in the earlier period.During the pollution process,the strong clear sky radiation creates favorable inversion conditions,the lower altitude of the atmospheric mixing layer,and the weaker ventilation capacity in the vertical direction,which make the atmosphere stable and not conducive to the diffusion of pollution,at the same time,both vertical and horizontal wind fields are weak to transport pollutants,so that PM_(2.5)gradually accumulated.Based on the wind profiler data,the local reflux index(R)was calculated,and it was found that the R value and the horizontal transport capacity of Chengdu gradually increased in the late stage of the pollution process,and the southeast was better in the early stage,the later west is better.
作者
赵欢
许晨
朱心悦
张松宇
康平
ZHAO Huan;XU Chen;ZHU Xinyue;ZHANG Songyu;KANG Ping(Chengdu Meteorological Bureau,Chengdu,610000,China;College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu,610225,China;Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu,610225,China)
出处
《成都信息工程大学学报》
2024年第5期644-648,共5页
Journal of Chengdu University of Information Technology
