气候变化领域集成服务门户(CCPortal): Regional impacts of black carbon morphologies on shortwave aerosol-radiation interactions: a comparative study between the US and China

CCPortal

DOI	10.5194/acp-22-7647-2022
	Regional impacts of black carbon morphologies on shortwave aerosol-radiation interactions: a comparative study between the US and China
	Luo, Jie; Li, Zhengqiang; Zhang, Chenchong; Zhang, Qixing; Zhang, Yongming; Zhang, Ying; Curci, Gabriele; Chakrabarty, Rajan K.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	7647
结束页码	7666
卷号	22 期号:11 页码:20
英文摘要	Black carbon (BC) is one of the dominant absorbing aerosol species in the atmosphere. It normally has complex fractal-like structures due to the aggregation process during combustion. A wide range of aerosol- radiation interactions (ARIs) of BC have been reported throughout experimental and modeling studies. One reason for the large discrepancies among multiple studies is the application of the oversimplified spherical morphology for BC in ARI estimates. In current climate models, the Mie theory is commonly used to calculate the optical properties of spherical BC aerosols. Here, we employ a regional chemical transport model coupled with a radiative transfer code that utilizes the non-spherical BC optical simulations to re-evaluate the effects of particles' morphologies on BC shortwave ARI, and the wavelength range of 0.3-4.0 mu m was considered. Anthropogenic activities and wildfires are two major sources of BC emissions. Therefore, we choose the typical polluted area in eastern China, which is dominated by anthropogenic emissions, and the fire region in the northwest US, which is dominated by fire emissions in this study. A 1-month simulation in eastern China and a 7 d simulation in the fire region in the northwest US were performed. The fractal BC model generally presents a larger clear-sky ARI compared to the spherical BC model. Assuming BC particles are externally mixed with other aerosols, the relative differences in the time-averaged clear-sky ARI between the fractal model with a fractal dimension (D-f) of 1.8 and the spherical model are 12.1 %-20.6 % and 10.5 %-14.9 % for typical polluted urban cities in China and fire sites in the northwest US, respectively. Furthermore, the regional-mean clear-sky ARI is also significantly affected by the BC morphology, and relative differences of 17.1 % and 38.7 % between the fractal model with a D(f )of 1.8 and the spherical model were observed in eastern China and the northwest US, respectively. However, the existence of clouds would weaken the BC morphological effects. The time-averaged all-sky ARI relative differences between the fractal model with a D-f of 1.8 and the spherical model are 4.9 %-6.4 % and 9.0 %-11.3 % in typical urban polluted cities and typical fire sites, respectively. Besides, for the regional-mean all-sky ARI, the relative differences between the fractal model and the spherical model are less than 7.3 % and 16.8 % in the polluted urban area in China and the fire region in the US, respectively. The results imply that current climate modeling may significantly underestimate the BC ARI uncertainties as the morphological effects on BC ARI are ignored in most 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:000810476200001
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/273114
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Washington University (WUSTL); Washington University (WUSTL); University of L'Aquila; University of L'Aquila
推荐引用方式 GB/T 7714	Luo, Jie,Li, Zhengqiang,Zhang, Chenchong,et al. Regional impacts of black carbon morphologies on shortwave aerosol-radiation interactions: a comparative study between the US and China[J],2022,22(11):20.
APA	Luo, Jie.,Li, Zhengqiang.,Zhang, Chenchong.,Zhang, Qixing.,Zhang, Yongming.,...&Chakrabarty, Rajan K..(2022).Regional impacts of black carbon morphologies on shortwave aerosol-radiation interactions: a comparative study between the US and China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(11),20.
MLA	Luo, Jie,et al."Regional impacts of black carbon morphologies on shortwave aerosol-radiation interactions: a comparative study between the US and China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.11(2022):20.