气候变化领域集成服务门户(CCPortal): Characteristics of carbonaceous aerosols analyzed using a multiwavelength thermal/optical carbon analyzer: A case study in Lanzhou City

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DOI	10.1007/s11430-017-9245-9
	Characteristics of carbonaceous aerosols analyzed using a multiwavelength thermal/optical carbon analyzer: A case study in Lanzhou City
	Zhang, Yulan; Kang, Shichang
发表日期	2019
ISSN	1674-7313
EISSN	1869-1897
卷号	62 期号:2
英文摘要	Characteristics of atmospheric carbonaceous aerosols in Lanzhou City from December 2014 to November 2015 are analyzed using a multiwavelength thermal/optical carbon analyzer. Results reveal that average concentrations of black carbon (BC) and organic carbon in atmospheric aerosols at Lanzhou are 6.7 and 25.4 g m(-3), respectively, showing obvious seasonality (higher in winter and lower in summer). This is consistent with findings in cities of northern China. Primary organic aerosols and secondary organic aerosols respectively account for approximately 60% and 17% of carbonaceous aerosols. No significant seasonality is found for secondary organic carbon, indicating that its potential sources do not vary significantly throughout the study period. The mass absorption cross-section (MAC(632 nm)) of BC is 7.1 m(2) g(-1), slightly higher than that of immediately emitted BC. MAC values of BC at different wavelengths vary drastically; they are higher for ultraviolet and visible light (8.5-10.2 m(2) g(-1)) than for near-infrared light (4.9-5.7 m(2) g(-1)). The aerosol absorption optical depth generally declines from the near-infrared to the near-ultraviolet region. The values are higher in winter than in summer, thus showing there are different contributions of BC deposition in different seasons. Brown carbon (BrC) has an angstrom ngstrom absorption exponent (AAE) value of approximately 2.75, which is similar to the AAE value of BrC generated by diesel combustion (2.3). The contribution of BrC to light absorption is as much as 34% at a wavelength of 635 nm. This study demonstrates that the multiwavelength thermal/optical carbon analyzer can quantify absorption properties of BrC in atmospheric aerosols. This can enhance understanding of carbonaceous aerosols and provide key parameters for simulations of climate models.
关键词	Carbonaceous aerosol Black carbon Organic carbon Brown carbon Multiwavelength thermal optical carbon analyzer
学科领域	Geology
语种	英语
WOS研究方向	Geosciences, Multidisciplinary
来源期刊	SCIENCE CHINA-EARTH SCIENCES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112041
作者单位	Chinese Acad Sci, State Key Lab Cryospher Sci, Northwest Inst Ecoenvironm Resources, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yulan,Kang, Shichang. Characteristics of carbonaceous aerosols analyzed using a multiwavelength thermal/optical carbon analyzer: A case study in Lanzhou City[J]. 中国科学院西北生态环境资源研究院,2019,62(2).
APA	Zhang, Yulan,&Kang, Shichang.(2019).Characteristics of carbonaceous aerosols analyzed using a multiwavelength thermal/optical carbon analyzer: A case study in Lanzhou City.SCIENCE CHINA-EARTH SCIENCES,62(2).
MLA	Zhang, Yulan,et al."Characteristics of carbonaceous aerosols analyzed using a multiwavelength thermal/optical carbon analyzer: A case study in Lanzhou City".SCIENCE CHINA-EARTH SCIENCES 62.2(2019).