广州城区黑碳气溶胶吸光增强特性研究

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Abstract In this study, Minimum R squared method (MRS), was used to calculate the primary mass absorption efficiency of the primary emissions (MAE_p) using elemental carbon (EC) as the tracer. The mass absorption efficiency of the ambient aerosols (MAE_t) was determined by co-located measurements of an Aethalometer and a carbon analyzer. The absorption enhancement factor at wavelength 520nm, E_abs520, was determined by the ratio of MAE_p/MAE_t. The sampling site was located at Jinan University Supersite. The sampling period covered both dry season (January 26~March 31, 2019) and wet season (May 1~July 31, 2018). The optical properties of BC were characterized in the urban area. The average EC concentration in the dry season was (1.93±1.38) μgC/m³, which was significantly higher than that in the wet season (1.46±0.75) μgC/m³. E_abs520 in the dry season (1.26±0.34) was lower than that in the wet season (1.63 ±0.55). The diurnal variations of E_abs520 behaved differently in the dry and wet seasons. OC, EC, OC/EC, and AAE_470-660 were higher in the dry season than in the wet season. The aerosol loading compensation parameter k and AAE_470-660 correlated well with E_abs520 on the diurnal scale in the wet season. No correlation was observed in the dry season, which might be related to the impact of biomass burning. The effects of O₃, NO₂ and SOC/OC on E_abs520 were discussed. The correlation between O₃ and E_abs520 was poor in the dry season (R²=0.21), and stronger in the wet season (R²=0.46), but SOC/OC showed the opposite relationship with E_abs520. Poor correlation between NO₂ and E_abs520 was observed in both wet and dry season (R²=0.01). Temperature dependence was observed on E_abs520 to a certain degree. The back-trajectory cluster analysis revealed that long-range transport air masses exhibited high E_abs520 values.

Key words： black carbon (BC) Guangzhou absorption enhancement factor (E_abs) minimum correlation coefficient method (MRS) absorption Ångström exponent (AAE)

Received: 22 February 2020

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X513

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	SUN Jia-yin
	WU Cheng
	WU Dui
	LI Mei
	DENG Tao
	YANG Wen-Da
	CHENG Peng
	LIANG Yue
	TAN Jian
	HE Guo-Wen
	CHENG Chun-Lei
	LI Lei
	ZHOU Zhen

Cite this article:

SUN Jia-yin,WU Cheng,WU Dui等. The light absorption enhancement characteristics of black carbon aerosols in urban Guangzhou[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4177-4189.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4177

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