Aerosol-radiation interaction and its variation in North China within 2015–2019 period under continuous PM_(2.5)improvements

作     者：Zhe Lv Xiaoqi Wang Wei Wei Huahua Bai Xiaoyu Liu Guohao Li Shuiyuan Cheng Zhe Lv;Xiaoqi Wang;Wei Wei;Huahua Bai;Xiaoyu Liu;Guohao Li;Shuiyuan Cheng

作者机构：Department of Environmental Science and EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Beijing on Regional Air Pollution ControlBeijing 100124China Beijing Municipal Research Institute of Eco-Environmental ProtectionBeijing 100037China Beijing Key Laboratory of Urban Atmospheric Volatile Organic Compounds Pollution Control and ApplicationBeijing 100037China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2024年第136卷第2期

页      面：81-94页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：funded by the National Natural Science Foundation of China (Nos.51978010 and 52022005)。 

主　　题：Radiative forcing Aerosol PM_(2.5) Boundary layer height(BLH) North China 

摘      要：A study was conducted on aerosol-radiation interactions over six cities in this region within the 2015–2019 period.WRF-Chem simulations on 2017 showed that based on the six-city average,the aerosol load(PM_(2.5)concentrations)of 121.9,49.6,43.3,and 66.3μg/m^(3)in January,April,July,and October,mainly lowered the level of downward shortwave radiation by 38.9,24.0,59.1,and 24.4 W/m~2and reduced the boundary layer height by 79.9,40.8,87.4,and 31.0 m,via scattering and absorbing solar radiation.The sensitivity of meteorological changes to identical aerosol loads varied in the order JulyJanuaryOctober and April.Then,the cooling and stabilizing effects of aerosols further led to increases in PM_(2.5),by23.0,3.4,4.6,and 7.3μg/m^(3)respectively in the four months.The sensitivity of the effect of aerosols on PM_(2.5)was greatest in January rather than in July,contrary to the effect on meteorology.Moreover,a negative linear relation was observed between daily BLH reductions and aerosol loads in fall and winter,and between PM_(2.5)increases and aerosol loads in all seasons.With the PM_(2.5)pollution improvements in this region,the aerosol radiative forcing was effectively reduced.This should result in daily BLH increases of 10–24 m in fall and winter,and the estimates in Beijing agreed well with the corresponding results based on AMDAR data.Additionally,the reduction in aerosol radiation effects brought about daily PM_(2.5)decreases of 1.6-2.8μg/m^(3),accounting for 7.0%–17.7%in PM_(2.5)improvements.