主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2022, Vol. 38 ›› Issue (3): 93-100.doi: 10.3969/j.issn.1673-503X.2022.03.011

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Analysis of variation characteristics of atmospheric self-purification capability in the main urban area of Zhengzhou from 1961 to 2020

Mei LIU1(),Xing-jie JI2,*(),Li TIAN3,Ya-lei DING4,Xuan ZUO5   

  1. 1. College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
    2. He'nan Institute of Meteorological Sciences, Zhengzhou 450000, China
    3. He'nan Meteorological Observatory, Zhengzhou 450003, China
    4. College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
    5. He'nan Climate Center, Zhengzhou 450003, China
  • Received:2021-01-12 Online:2022-06-28 Published:2022-07-23
  • Contact: Xing-jie JI E-mail:1505943482@qq.com;jixingjie2004@aliyun.com

Abstract:

Based on the meteorological observation data from 1961 to 2020 and the air quality monitoring data from 2014 to 2018 in the main urban area of Zhengzhou, the long-term trend and influencing factors of atmospheric self-purification capacity(ASPC) index in this area were analyzed, and the relationship between the ASPC and PM2.5 was studied.The results show that from 1981 to 2010, the ASPC index has an average value of 4.42 t·(d·km2)-1, the largest value of 5.2 t·(d·km2)-1 in spring, and the smallest value of 3.88 t·(d·km2)-1 in autumn, which is disadvantage to the removal of air pollutants.From 1961 to 2020, the ASPC in the study region shows a significant weakening trend with a maximum value of 6.85 t·(d·km2)-1 in 1969 and a minimum value of 3.06 t·(d·km2)-1 in 2020.The mixing layer thickness is positively correlated with the ASPC index.The number of days with daily mean wind speed ≥2.5 m·s-1 and light wind days are significantly positively and negatively correlated with the ASPC, respectively.Furthermore, the ASPC index is significantly correlated with the number of precipitation days.Specifically, the increase in the number of heavy precipitation days after 2015 has a certain influence on the enhancement of ASPC in the same period.In addition, the study also shows that there was a significantly negative correlation between ASPC and PM2.5 concentration in the main urban area, indicating that the stronger ASPC is, the lower the corresponding PM2.5 concentration is, and the better the ambient air quality is.

Key words: Atmospheric self-purification capability, Mixed layer thickness, Wind velocity, Precipitation, PM2.5

CLC Number: