State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China; Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361102, China; College of Ocean and Earth Science, Xiamen University, Xiamen 361102, China.
College of Ocean and Earth Science, Xiamen University, Xiamen 361102, China.
Chemosphere. 2017 Oct;184:916-923. doi: 10.1016/j.chemosphere.2017.06.058. Epub 2017 Jun 16.
Polycyclic aromatic hydrocarbons (PAHs) have accumulated ubiquitously inArctic environments, where re-volatilization of certain organic pollutants as a result of climate change has been observed. To investigate the fate of semivolatile organic compounds in the Arctic, dissolved PAHs in the surface seawaters from the temperate Pacific Ocean to the Arctic Ocean, as well as a water column in the Arctic Ocean, were collected during the 4th Chinese National Arctic Research Expedition in summer 2010. The total concentrations of seven dissolved PAHs in surface water ranged from 1.0 to 5.1 ng L, decreasing with increasing latitude. The vertical profile of PAHs in the Arctic Ocean was generally characteristic of surface enrichment and depth depletion, which emphasized the role of vertical water stratification and particle settling processes. A level III fugacity model was developed in the Bering Sea under steady state assumption. Model results quantitatively simulated the transfer processes and fate of PAHs in the air and water compartments, and highlighted a summer air-to-sea flux of PAHs in the Bering Sea, which meant that the ocean served as a sink for PAHs, at least in summer. Acenaphthylene and acenaphthene reached equilibrium in air-water diffusive exchange, and any perturbation, such as a rise in temperature, might lead to disequilibrium and remobilize these compounds from their Arctic reservoirs.
多环芳烃（PAHs）在北极环境中普遍存在，在那里，由于气候变化，某些有机污染物已经重新挥发。为了研究半挥发性有机化合物在北极的命运，我们在 2010 年夏季中国第四次国家北极研究考察中，采集了来自太平洋温带地区到北极地区的表层海水中溶解的 PAHs 以及北极海域的水柱。在表层水中，七种溶解 PAHs 的总浓度范围为 1.0 到 5.1ng/L，随着纬度的增加而降低。北极海域的 PAHs 垂直分布特征通常是表层富集和深度耗尽，这强调了垂直水层化和颗粒沉降过程的作用。在稳定状态假设下，在白令海开发了一个 III 级逸度模型。模型结果定量模拟了 PAHs 在空气和水相中的迁移过程和归宿，并突出了白令海夏季 PAHs 的空气-海水通量，这意味着海洋至少在夏季是 PAHs 的汇。苊烯和苊达到了空气-水扩散交换中的平衡，如果出现任何干扰，如温度升高，可能会导致失衡，并使这些化合物从其北极储层中重新释放出来。
