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Time-resolved black carbon aerosol vertical distribution measurements using a 356-m meteorological tower in Shenzhen
Sun, Tianlin1,2,3; Wu, Cheng1,2,3; Wu, Dui1,3,4; Liu, Ben5; Sun, Jia Yin1,3; Mao, Xia6; Yang, Honglong6; Deng, Tao4; Song, Lang1,3; Li, Mei1,3; Li, Yong Jie5; Zhou, Zhen1,3
Source PublicationTheoretical and Applied Climatology

Black carbon (BC) is an essential climate forcer in the atmosphere. Large uncertainties remain in BC’s radiative forcing estimation by models, partially due to the limited measurements of BC vertical distributions near the surface layer. We conducted time-resolved vertical profiling of BC using a 356-m meteorological tower in Shenzhen, China. Five micro-aethalometers were deployed at different heights (2, 50, 100, 200, and 350 m) to explore the temporal dynamics of BC vertical profile in the highly urbanized areas. During the observation period (December 6–15, 2017), the average equivalent BC (eBC) concentrations were 6.6 ± 3.6, 5.4 ± 3.3, 5.9 ± 2.8, 5.2 ± 1.8, and 4.9 ± 1.4 μg m, from 2 to 350 m, respectively. eBC temporal variations at different heights were well correlated. eBC concentrations generally decreased with height. At all five heights, eBC diurnal variations exhibited a bimodal pattern, with peaks appearing at 09:00–10:00 and 19:00–21:00. The magnitudes of these diurnal peaks decreased with height, and the decrease was more pronounced for the evening peak. eBC episodes were largely initiated by low wind speeds, implying that wind speed played a key role in the observed eBC concentrations. eBC wind-rose analysis suggested that elevated eBC events at different heights originate from different directions, which suggested contributions from local primary emission plumes. Air masses from central China exhibited much higher eBC levels than the other three backward trajectory clusters found herein. The absorption Ångström exponent (AAE) showed clear diurnal variations at 350 m and increased slightly with height.

KeywordMeteorological Tower Micro-aethalometer Black Carbon Aerosol Vertical Distribution
URLView the original
Indexed BySCIE
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000529922600033
Scopus ID2-s2.0-85081546787
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Document TypeJournal article
Affiliation1.Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China
2.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
3.Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou, 510632, China
4.Institute of Tropical and Marine Meteorology, CMA, Guangzhou, 510080, China
5.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, China
6.Shenzhen Meteorological Bureau, CMA, Shenzhen, 518040, China
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GB/T 7714
Sun, Tianlin,Wu, Cheng,Wu, Dui,et al. Time-resolved black carbon aerosol vertical distribution measurements using a 356-m meteorological tower in Shenzhen[J]. Theoretical and Applied Climatology,2020,140(3-4):1263-1276.
APA Sun, Tianlin,Wu, Cheng,Wu, Dui,Liu, Ben,Sun, Jia Yin,Mao, Xia,Yang, Honglong,Deng, Tao,Song, Lang,Li, Mei,Li, Yong Jie,&Zhou, Zhen.(2020).Time-resolved black carbon aerosol vertical distribution measurements using a 356-m meteorological tower in Shenzhen.Theoretical and Applied Climatology,140(3-4),1263-1276.
MLA Sun, Tianlin,et al."Time-resolved black carbon aerosol vertical distribution measurements using a 356-m meteorological tower in Shenzhen".Theoretical and Applied Climatology 140.3-4(2020):1263-1276.
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