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 ›› 2019, Vol. 35 ›› Issue (5): 85-92.doi: 10.3969/j.issn.1673-503X.2019.05.011

• ARTICLES • Previous Articles     Next Articles

Daily maximum mixing height and its effects on air quality in the Pearl River Delta region

LIAO Zhi-heng1, XU Xin-qi1, XIE Jie-lan1, ZHOU Xue-si1, FAN Shao-jia1,2   

  1. 1. School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275, China;
    2. Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2018-08-09 Revised:2018-11-13 Online:2019-10-30 Published:2019-10-08

Abstract: Atmospheric mixing height is one of the main factors affecting vertical diffusion and plays an important role in the assessment of air quality and the storage and distribution of air pollutants.Based on 4-year (from April 2014 to March 2018) radiosonde measurements at Hong Kong (coastal) and Qingyuan (inland) stations,this study employs the dry adiabatic curve method to estimate the daily maximum mixing height (MMH) in the Pearl River Delta (PRD) region,then discusses the spatial differences of the MMHs in the coastal and inland areas,and finally analyzes the effects of the MMH on regional air pollution.The results show that the atmospheric mixing height has typical local characteristics.Specifically,the MMH in the coastal area is lower than that in the inland area and their average values are 982 m and 1198 m,respectively.The spatial differences of the MMH in the PRD region can be jointly explained by many factors,among which temperature diurnal range plays the most important role.The coastal area features a relatively smaller temperature diurnal range due to the modulation of seawater on air temperature,so the atmospheric mixed layer is relatively lower.Besides,there are great distinctions in the correlation between the air pollutants and the MMH in the PRD region.The primary pollutants (e.g.,CO) are negatively correlated with the MMH,while the secondary pollutants (e.g.,O3) are positively correlated with the MMH.In contrast,atmospheric particulate matters (e.g.,PM2.5) are weakly correlated with the MMH likely due to the complexity of their sources (including primary emission and secondary formation).

Key words: Maximum mixing height, Air pollution, Spatial difference, Correlation

CLC Number: