气候变化领域集成服务门户(CCPortal): Distinct impacts of humidity profiles on physical properties and secondary formation of aerosols in Shanghai

CCPortal

DOI	10.1016/j.atmosenv.2021.118756
	Distinct impacts of humidity profiles on physical properties and secondary formation of aerosols in Shanghai
	Liu T.; He Q.; Chen Y.; Liu J.; Liu Q.; Fu X.; Zhang J.; Huang G.; Li R.
发表日期	2021
ISSN	1352-2310
卷号	267
英文摘要	As a key component in the atmosphere, the increase in water vapor content can aggravate air pollution by promoting hygroscopic growth and secondary formation of aerosols. In this study, water vapor mixing ratio (WVMR) profiles retrieved from Raman lidar at night in Shanghai were used to evaluate the accuracy of a maintained microwave radiometer (MWR) and reanalysis datasets (ERA5 from ECMWF and MERRA-2 from NASA). The relative humidity (RH) profiles from radiosonde and reanalysis datasets were used to explore the influence of humidity vertical distributions on aerosol physical properties and secondary formation. There was a large WVMR difference between MWR and Raman lidar, with a mean bias (MB) and a root mean square error (RMSE) being 2.47 g/kg and 3.29 g/kg, respectively. However, the WVMR from ERA5 and MERRA-2 showed excellent agreement (correlation coefficients were both 0.94, N = 11288 and 3619, respectively) with that from Raman lidar and high accuracy especially MERRA-2, which are more suitable for meteorological and climatic applications than MWR. It was found that RH had a significant effect on the vertical distribution of aerosol extinction coefficient (AEC). Aerosol hygroscopic growth caused by high RH resulted in an obvious enhancement of AEC at 355 nm below 610 m in summer. As a good indicator for determining contribution of aerosol secondary formation, large ratios of PM2.5 to CO (PM2.5/CO > 0.08) corresponded to high nitrogen oxidation ratios (NOR), sulfur oxidation ratios (SOR), and also high RH below 800 m during nighttime in winter, suggesting that RH and its vertical distribution played an important role in the aerosol secondary formation. The RH was high in the vertical direction when nitrate and sulfate mainly come from the secondary formation (NOR >0.1 or SOR >0.1), and in contrast to nitrate, the secondary formation for sulfates tended to depend on higher RH (>70%), which indicated that more stringent measures for nitrogen oxides emission reduction should be implemented in Shanghai to reduce the pollution of secondary aerosols in the future. © 2021 Elsevier Ltd
关键词	Aerosol secondary formation Raman lidar Relative humidity Water vapor mixing ratio
语种	英语
scopus关键词	Emission control; Mean square error; Microwave devices; Mixing; NASA; Nitrates; Nitrogen oxides; Optical radar; Physical properties; Sulfur compounds; Water pollution; Water vapor; Aerosol extinction coefficient; Aerosol secondary formation; Higher relative humidity; Humidity profile; Hygroscopic growth; Microwave radiometers; Raman lidars; Reanalysis; Vertical distributions; Water vapor mixing ratio; Aerosols; carbon monoxide; nitrate; nitrogen; nitrogen oxide; sulfate; sulfur; aerosol; aerosol composition; extinction coefficient; microwave radiometer; mixing ratio; nitrogen oxides; oxidation; radiosonde; relative humidity; vertical distribution; water vapor; aerosol; air pollution; air temperature; Article; atmosphere; China; climate; correlation coefficient; data accuracy; meteorology; microwave radiation; night; oxidation; particulate matter; particulate matter 2.5; relative humidity; summer; water vapor; water vapor mixing ratio; wettability; winter; China; Shanghai; Indicator indicator
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248197
作者单位	College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China; Shanghai Meteorological Service, Shanghai, 201199, China; Shanghai Key Laboratory of Meteorology and Health, Shanghai, 201199, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
推荐引用方式 GB/T 7714	Liu T.,He Q.,Chen Y.,et al. Distinct impacts of humidity profiles on physical properties and secondary formation of aerosols in Shanghai[J],2021,267.
APA	Liu T..,He Q..,Chen Y..,Liu J..,Liu Q..,...&Li R..(2021).Distinct impacts of humidity profiles on physical properties and secondary formation of aerosols in Shanghai.ATMOSPHERIC ENVIRONMENT,267.
MLA	Liu T.,et al."Distinct impacts of humidity profiles on physical properties and secondary formation of aerosols in Shanghai".ATMOSPHERIC ENVIRONMENT 267(2021).