气溶胶辐射效应对气象和环境影响的观测与模拟研究

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Abstract Two representative years (2015 and 2019) were selected to investigate the impact of aerosol radiation effect on bulk atmospheric transmissivity and incoming solar radiation, as well as the evolution of such effect, on the basis of in-situ observation and numerical simulation. With the application of the online coupled atmospheric chemistry model WRF-Chem, the feedback mechanism of aerosol radiative effect on the vertical distribution of meteorological factors, the boundary layer structures and the PM_2.5 concentration during heavy pollution episodes were analyzed. Results showed that: haze pollution could lead to the obvious decline of bulk atmospheric transmissivity and this effect was dominant at noon. In spring, autumn and winter, haze pollution could lead to the reduction of bulk atmospheric transmissivity by 0.09, 0.11 and 0.09 at noon, respectively. The annual mean atmospheric transmissivity was reduced by about 15.5% due to haze pollution. While atmospheric transmissivity reduction due to cloud cover was about 22.4%, compared to clear days. The impact of aerosol and cloud on atmospheric transmissivity was also related to solar elevation angle. When the solar elevation angle was higher than 60°, haze pollution could lead to a reduction of atmospheric transmissivity of 8.6%. The attenuation of aerosol radiation effect on solar radiation would be enhanced with the aggravation of haze pollution. As the air quality level in Tianjin changing from I to Ⅵ, the mean incoming shortwave radiation flux at noon would be 484, 446, 439, 342, 328 and 253W/m², respectively. During heavy pollution episode, the aerosol radiation effect could lead to cooling (0.8 ℃) and moistening (3.8%) of near-surface layer (below 250m), as well as heating (0.5℃) and drying (2.4%) of upper layer (300~1900m), which would then lead to the enhancement of inversion intensity and the weakening of vertical diffusion. This would finally form the positive aerosol-radiation-boundary layer-pollution feedback, hence lead to the further enhancement of PM_2.5 concentration (up to 40µg/m³) near the surface, and this effect was more evident at about 16:00 in the afternoon. Since the implementation of atmospheric pollution prevention and control actions, the air quality in Tianjin has been continuously improved. Compared to 2015, the annual average PM_2.5 concentration of 2019 in Tianjin was reduced by 27.1% and the number of polluted days was reduced by 43.8%. As a result, the attenuation effect of aerosol on solar radiation was weakened, as the haze pollution would lead to the reduction of noontime atmospheric transmissivity by 0.05 in the winter of 2019. Air pollution (AQI grade higher than Ⅳ) would reduce the incident shortwave radiation by 85.3W/m² at noontime. Nonetheless, during heavy pollution episode in 2019, the aerosol radiation effect could still exert a nonnegligible impact on the aggravation of pollution levels (up to 20µg/m³) through the modification of vertical atmospheric stratification.

Key words： aerosol radiation effect bulk atmospheric transmissivity heavy pollution episode atmospheric boundary layer feedback mechanism

Received: 09 June 2022

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	YANG Jian-bo
	CAI Zi-ying
	YANG Xu
	XING Rui
	MENG Li-hong
	LI Ying-hua

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YANG Jian-bo,CAI Zi-ying,YANG Xu等. Observation and modeling study of the influence of aerosol radiation effect on meteorology and environment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 38-51.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/38

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