Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions

Wang, Qiyuan; Liu, Huikun; Wang, Ping; Dai, Wenting; Zhang, Ting; Zhao, Yibing; Tian, Jie; Zhang, Wenyan; Han, Yongming; Cao, Junji

doi:10.5194/acp-20-15537-2020

Cited by 25 publications

(14 citation statements)

References 55 publications

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“…The NCP region is one of the economic zones in China, while most affected by air pollution ( Li et al, 2020 ; Sun et al, 2021b ). Carbonaceous aerosol is one of the main components of atmospheric particulate matter, which is of great significance due to its role in climate change, earth's radiation balance, visibility, and human health ( Bikkina et al, 2017 ; Li et al, 2009 ; Wang et al, 2020b ; Wang et al, 2020e ). Organic carbon (OC) is the main component (~90%) ( Ram et al, 2008 ) of carbonaceous aerosols, while organic aerosol (OA) is an important contributor (20–90 wt%) to PM 2.5 ( Cao et al, 2012 ; Sosa et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Evolution of organic carbon during COVID-19 lockdown period: Possible contribution of nocturnal chemistry

Feng

Zheng

Fan

et al. 2022

Science of The Total Environment

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Carbonaceous aerosol is one of the main components of atmospheric particulate matter, which is of great significance due to its role in climate change, earth's radiation balance, visibility, and human health. In this work, carbonaceous aerosols were measured in Shijiazhuang and Beijing using the OC/EC analyzer from December 1, 2019 to March 15, 2020, which covered the Coronavirus Disease 2019 (COVID-19) pandemic. The observed results show that the gas-phase pollutants, such as NO, NO 2 , and aerosol-phase pollutants (Primary Organic Compounds, POC) from anthropogenic emissions, were significantly reduced during the lockdown period due to limited human activities in North China Plain (NCP). However, the atmospheric oxidation capacity (O x /CO) shows a significantly increase during the lockdown period. Meanwhile, additional sources of nighttime Secondary Organic Carbon (SOC), Secondary Organic Aerosol (SOA), and b abs, BrC (370 nm) are observed and ascribed to the nocturnal chemistry related to NO 3 radical. The Potential Source Contribution Function (PSCF) analysis indicates that the southeast areas of the NCP region contributed more to the SOC during the lockdown period than the normal period. Our results highlight the importance of regional nocturnal chemistry in SOA formation.

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Section: Introductionmentioning

confidence: 99%

Evolution of organic carbon during COVID-19 lockdown period: Possible contribution of nocturnal chemistry

Feng

Zheng

Fan

et al. 2022

Science of The Total Environment

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“…Ambient concentrations of V and Ni together with the ratios between them related to ship emissions in coastal regions have been reported in a number of studies, and most of the earlier ones relied on manual filter samples for periodic observation in which the intervals were at least 12–24 h. − Several online measurement technologies such as particle-induced Streaker sampling with particle-induced X-ray emission spectrometry (PIXE) analysis and rotating drum impactor sampling with synchrotron radiation induced X-ray fluorescence (SR-XRF) have been developed and applied to observe metal compositions in particles including V and Ni. Recently, a highly time-resolved Xact method based on nondestructive energy dispersive XRF (ED-XRF) analysis has been developed and applied in the measurements in America, Europe, and Asia including coastal regions of China. − It is feasible to capture the signal of ship emissions using the Xact method.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Ni/V Ratio in the Ship-Emitted Particles Driven by Multiphase Fuel Oil Regulations in Coastal China

Zhang

Yang³

et al. 2021

Environ. Sci. Technol.

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This study aims to investigate the effect of the stepwise marine fuel oil regulations on the concentrations of vanadium (V) and nickel (Ni) in ambient air based on a 4-y (2017–2020) online measurement in Shanghai, a coastal city in China. The annual concentration of V was reduced by 58% due to the switch from Domestic Emission Control Area (DECA) 1.0 to DECA 2.0 and further by 74% after the implementation of the International Maritime Organization (IMO) 2020 regulation, while the reduction rate for Ni was only 27% and then 18% respectively. Consistently, a reduction of 84% in V content and a negligible change in Ni content were measured in 180cst ship oil samples from 2010 to 2020. The similar increasing trend of Ni/V ratios (from <0.4 to >2.0) in both ambient measurement and heavy fuel oil samples suggests that the DECA and IMO 2020 regulations effectively reduced the ambient V. However, nickel content is still enriched in the in-use desulfurized residual oils and ship-emitted particles in coastal China. Meanwhile, the previous ratio between V and Ni cannot be used as a tracer for identifying ship-emitted particles due to its large variation in oils. Further updating of the source profile of ship traffic emissions in coastal cities is necessary in the future.

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“…S1). The contribution of secondary BrC in cloud INT and cloud-free particles are in the low range of reported values (as summarized in Table S2) (Gao et al, 2022;Kaskaoutis et al, 2021;Lin et al, 2021;Wang et al, 2019aWang et al, , 2019bWang et al, , 2020bWang et al, , 2021Zhang et al, 2020Zhang et al, , 2021Zhu et al, 2021). Differently, the contribution of secondary formed BrC to the total BrC light-absorption is 67-85% in the cloud RES particles, surprisingly higher than those in the cloud-free and cloud INT particles.…”

Section: The Optical Properties Of Brc During Cloud Eventsmentioning

confidence: 88%

The optical properties and in-situ observational evidence for the formation of brown carbon in cloud

Guo

Yang

et al. 2021

Preprint

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Abstract. Atmospheric brown carbon (BrC) makes a substantial contribution to aerosol light-absorbing and thus the global radiative forcing. Although BrC may change the lifetime of the cloud and ultimately affect precipitation, little is known regarding the optical properties and formation of BrC in the cloud. In the present study, the light-absorption properties of cloud droplet residual (cloud RES) were measured by coupled a ground-based counterflow virtual impactor (GCVI) and an Aethalometer (AE-33), in addition to the cloud interstitial (cloud INT) and ambient (cloud-free) particles by PM2.5 inlet-AE-33, at Mt. Tianjing (1690 m a.s.l.), a remote mountain site in southern China, from November to December 2020. Meanwhile, the light-absorption and fluorescence properties of water-soluble organic carbon (WSOC) in the collected cloud water and PM2.5 samples were also obtained, associated with the concentration of water-soluble ions. The mean light-absorption coefficient (Abs370) of the cloud RES, cloud INT, and cloud-free particles were 0.25 ± 0.15, 1.16 ± 1.14, and 1.47 ± 1.23 Mm−1, respectively. The Abs365 of WSOC was 0.11 ± 0.08 Mm−1 in cloud water and 0.40 ± 0.31 Mm−1 in PM2.5, and the corresponding mass absorption efficiency (MAE365) was 0.17 ± 0.07 and 0.31 ± 0.21 m2·g−1, respectively. A comparison of the light-absorption coefficient between BrC in the cloud RES/cloud INT and WSOC in cloud water/PM2.5 indicates a considerable contribution (48–75 %) of water-insoluble BrC to total BrC light-absorption. Secondary BrC estimated by minimum R squared (MRS) method dominated the total BrC in cloud RES (67–85 %), rather than in the cloud-free (11–16 %) and cloud INT (9–23 %) particles. It may indicate the formation of secondary BrC during cloud processing. Supporting evidence includes the enhanced WSOC and dominant contribution of secondary formation/biomass burning factor (> 80 %) to Abs365 in cloud water provided by Positive Matrix Factorization (PMF) analysis. In addition, we showed that the light-absorption of BrC in cloud water was closely related to humic-like substances and tyrosine/proteins-like substances (r > 0.63, p < 0.01), whereas only humic-like substances for PM2.5, as identified by excitation-emission matrix fluorescence spectroscopy.

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Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions

Cited by 25 publications

References 55 publications

Evolution of organic carbon during COVID-19 lockdown period: Possible contribution of nocturnal chemistry

Evolution of organic carbon during COVID-19 lockdown period: Possible contribution of nocturnal chemistry

Dynamic Ni/V Ratio in the Ship-Emitted Particles Driven by Multiphase Fuel Oil Regulations in Coastal China

The optical properties and in-situ observational evidence for the formation of brown carbon in cloud

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