Net volatilization of PAHs from the North Pacific to the Arctic Ocean observed by passive sampling.
Net volatilization of PAHs from the North Pacific to the Arctic Ocean observed by passive sampling.
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DOI：
10.1016/j.envpol.2021.116728
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发表时间：
2021-02
影响因子：
8.9
通讯作者：
Haowen Zheng;M. Cai;Wenlu Zhao;M. Khairy;Mian Chen;Hengxiang Deng;R. Lohmann
中科院分区：
文献类型：
--
作者：
Haowen Zheng;M. Cai;Wenlu Zhao;M. Khairy;Mian Chen;Hengxiang Deng;R. Lohmann
北太平洋-北冰洋是半挥发性有机化合物(SVOCs)全球海洋资源清单的重要组成部分，但它们是“源”还是“汇”仍存在争议。为研究SVOCs向极地远距离输送过程中的海-气交换和去向，于2014年7月至9月对低海拔大气和表层海水中多环芳烃(PAHs)进行了被动采样。气态多环芳烃浓度(0.67~13 ng/m−3)以菲(Phe)和荧烯(Flu)为主，与纬度呈负相关，与分压和逆温呈显著线性关系。海水中多环芳烃浓度(L−1为1.8-16 ng)具有区域性特征，东亚附近含量较高，白令海峡含量较低。提出了东亚季风对气态多环芳烃的潜在影响，气态多环芳烃类似于表层海水中的多环芳烃，来自燃烧源。此外，数据表明，在整个航行过程中，多环芳烃从海水到空气中的净挥发量；通量与海水中多环芳烃的区域和月分布相似。我们的结果进一步强调了在开放的海洋环境中，海-气交换是多环芳烃的一个重要过程。
The North Pacific-Arctic Oceans are important compartments for semi-volatile organic compounds’ (SVOCs) global marine inventory, but whether they act as a “source" or "sink” remains controversial. To study the air-sea exchange and fate of SVOCs during their poleward long-range transport, low-altitude atmosphere and surface seawater were measured for polycyclic aromatic hydrocarbons (PAHs) by passive sampling from July to September in 2014. Gaseous PAH concentrations (0.67–13 ng m−3) were dominated by phenanthrene (Phe) and fluorene (Flu), which displayed an inverse correlation with latitude, as well as a significant linear relationship with partial pressure and inverse temperature. Concentrations of PAHs in seawater (1.8–16 ng L−1) showed regional characteristics, with higher levels near the East Asia and lower values in the Bering Strait. The potential impact from the East Asian monsoon was suggested for gaseous PAHs, which – similar to PAHs in surface seawater - were derived from combustion sources. In addition, the data implied net volatilization of PAHs from seawater into the air along the entire cruise; fluxes displayed a similar pattern to regional and monthly distribution of PAHs in seawater. Our results further emphasized that air-sea exchange is an important process for PAHs in the open marine environments.