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DOI	10.5194/acp-22-12401-2022
	Parameterizations of size distribution and refractive index of biomass burning organic aerosol with black carbon content
	Luo, Biao; Kuang, Ye; Huang, Shan; Song, Qicong; Hu, Weiwei; Li, Wei; Peng, Yuwen; Chen, Duohong; Yue, Dingli; Yuan, Bin; Shao, Min
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12401
结束页码	12415
卷号	22 期号:18 页码:15
英文摘要	Biomass burning organic aerosol (BBOA) impacts significantly on climate directly through scattering and absorbing solar radiation and indirectly through acting as cloud condensation nuclei. However, fundamental parameters in the simulation of BBOA radiative effects and cloud activities such as size distribution and refractive index remain poorly parameterized in models. In this study, biomass burning events with high combustion efficiency characterized by a high black carbon (BC) to BBOA ratio (0.22 on average) were frequently observed during autumn in the Pearl River Delta region, China. An improved absorption Angstrom exponent (AAE) ratio method considering both variations and spectral dependence of black carbon AAE was proposed to differentiate brown carbon (BrC) absorptions from total aerosol absorptions. BBOA size distributions, mass scattering and absorption efficiency were retrieved based on the changes in aerosol number size distribution, scattering coefficients and derived BrC absorptions that occurred with BBOA spikes. Geometric mean diameter of BBOA volume size distribution D(gv )depended largely on combustion conditions, ranging from 245 to 505 nm, and a linear relationship between D-gv and Delta BC/Delta BBOA was achieved. The retrieved real part of the BBOA refractive index ranges from 1.47 to 1.64, with evidence showing that its variations might depend largely on combustion efficiency, which is rarely investigated in existing literature but which however requires further comprehensive investigations. Retrieved imaginary parts of BBOA refractive index (m(i,BBOA)) correlated highly with Delta BC/Delta BBOA (R >0.88) but differ a lot from previous parameterization schemes. The reason behind the inconsistency might be that single formula parameterizations of m(i)(,BBOA) over the whole BC/BBOA range were used in previous studies which might deviate substantially for specific BC/BBOA ranges. Thus, a new scheme that parameterizes wavelength-dependent m(i,BBOA) was presented, which filled the gap for field-based BBOA absorptivity parameterizations of BC/BBOA >0.1. These findings have significant implications for simulating BBOA climate effects and suggest that linking both BBOA refractive index and BBOA volume size distributions to BC content might be a feasible and a good choice for climate models.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000855825400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273547
作者单位	Jinan University; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS
推荐引用方式 GB/T 7714	Luo, Biao,Kuang, Ye,Huang, Shan,et al. Parameterizations of size distribution and refractive index of biomass burning organic aerosol with black carbon content[J],2022,22(18):15.
APA	Luo, Biao.,Kuang, Ye.,Huang, Shan.,Song, Qicong.,Hu, Weiwei.,...&Shao, Min.(2022).Parameterizations of size distribution and refractive index of biomass burning organic aerosol with black carbon content.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),15.
MLA	Luo, Biao,et al."Parameterizations of size distribution and refractive index of biomass burning organic aerosol with black carbon content".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):15.