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Air-sea exchange and gas-particle partitioning of polycyclic aromatic hydrocarbons over the northwestern Pacific Ocean: Role of East Asian continental outflow
Zilan Wu;  Tian Lin;  Zhongxia Li;  Yuqing Jiang;  Yuanyuan Li;  Xiaohong Yao;  Huiwang Gao;  Zhigang Guo
2017
Source PublicationEnvironmental Pollution
Volume230Pages:444-452
Abstract

We measured 15 parent polycyclic aromatic hydrocarbons (PAHs) in atmosphere and water during a research cruise from the East China Sea (ECS) to the northwestern Pacific Ocean (NWP) in the spring of 2015 to investigate the occurrence, air-sea gas exchange, and gas particle partitioning of PAHs with a particular focus on the influence of East Asian continental outflow. The gaseous PAH composition and identification of sources were consistent with PAHs from the upwind area, indicating that the gaseous PAHs (three-to five-ring PAHs) were influenced by upwind land pollution. In addition, air sea exchange fluxes of gaseous PAHs were estimated to be -54.2-107.4 ng m(-2) d(-1), and was indicative of variations of land-based PAH inputs. The logarithmic gas particle partition coefficient (logK(p)) of PAHs regressed linearly against the logarithmic subcooled liquid vapor pressure (logP(L)(0)), with a slope of -0.25. This was significantly larger than the theoretical value (-1), implying disequilibrium between the gaseous and particulate PAHs over the NWP. The non-equilibrium of PAH gas particle partitioning was shielded from the volatilization of three-ring gaseous PAHs from seawater and lower soot concentrations in particular when the oceanic air masses prevailed. Modeling PAH absorption into organic matter and adsorption onto soot carbon revealed that the status of PAH gas particle partitioning deviated more from the modeling K-p for oceanic air masses than those for continental air masses, which coincided with higher volatilization of three-ring PAHs and confirmed the influence of air-sea exchange. Meanwhile, significant linear regressions between logK(p) and IogK(oa) (logK(sa)) for PAHs were observed for continental air masses, suggesting the dominant effect of East Asian continental outflow on atmospheric PAHs over the NWP during the sampling campaign.

KeywordPahs Airesea Exchange Gaseparticle Partitioning East Asian Continental Outflow Northwestern Pacific Ocean
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8034
Collection环境地球化学国家重点实验室
Affiliation1.Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Institute of Atmospheric Sciences, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.College of Environmental Science & Engineering, Ocean University of China, Qingdao 266100, China
Recommended Citation
GB/T 7714
Zilan Wu;Tian Lin;Zhongxia Li;Yuqing Jiang;Yuanyuan Li;Xiaohong Yao;Huiwang Gao;Zhigang Guo. Air-sea exchange and gas-particle partitioning of polycyclic aromatic hydrocarbons over the northwestern Pacific Ocean: Role of East Asian continental outflow[J]. Environmental Pollution,2017,230:444-452.
APA Zilan Wu;Tian Lin;Zhongxia Li;Yuqing Jiang;Yuanyuan Li;Xiaohong Yao;Huiwang Gao;Zhigang Guo.(2017).Air-sea exchange and gas-particle partitioning of polycyclic aromatic hydrocarbons over the northwestern Pacific Ocean: Role of East Asian continental outflow.Environmental Pollution,230,444-452.
MLA Zilan Wu;Tian Lin;Zhongxia Li;Yuqing Jiang;Yuanyuan Li;Xiaohong Yao;Huiwang Gao;Zhigang Guo."Air-sea exchange and gas-particle partitioning of polycyclic aromatic hydrocarbons over the northwestern Pacific Ocean: Role of East Asian continental outflow".Environmental Pollution 230(2017):444-452.
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