Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, School of Ecology and Environment, Anhui Normal University, Wuhu, Anhui, 241002, PR China.
Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, School of Ecology and Environment, Anhui Normal University, Wuhu, Anhui, 241002, PR China; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA.
Environ Pollut. 2021 Jan 1;268(Pt B):115963. doi: 10.1016/j.envpol.2020.115963. Epub 2020 Oct 29.
Air and seawater samples were collected in 2016 over the North Pacific Ocean (NPO) and adjacent Arctic Ocean (AO), and Polycyclic Aromatic Hydrocarbons (PAHs) were quantified in them. Atmospheric concentrations of ∑ PAHs (gas + particle phase) were 0.44-7.0 ng m (mean = 2.3 ng m), and concentrations of aqueous ∑ PAHs (dissolved phase) were 0.82-3.7 ng L (mean = 1.9 ng L). Decreasing latitudinal trends were observed for atmospheric and aqueous PAHs. Results of diagnostic ratios suggested that gaseous and aqueous PAHs were most likely to be related to the pyrogenic and petrogenic sources, respectively. Three sources, volatilization, coal and fuel oil combustion, and biomass burning, were determined by the PMF model for gaseous PAHs, with percent contributions of 10%, 44%, and 46%, respectively. The 4- ring PAHs underwent net deposition during the cruise, while some 3- ring PAHs were strongly dominated by net volatilization, even in the high latitude Arctic region. Offshore oil/gas production activities might result in the sustained input of low molecular weight 3- ring PAHs to the survey region, and further lead to the volatilization of them. Compared to the gaseous exchange fluxes, fluxes of atmospheric dry deposition and gaseous degradation were negligible. According to the extrapolated results, the gaseous exchange of semivolatile aromatic-like compounds (SALCs) may have a significant influence on the carbon cycling in the low latitude oceans, but not for the high latitude oceans.
2016 年在北太平洋（NPO）和邻近的北冰洋（AO）采集了空气和海水样本，并对其中的多环芳烃（PAHs）进行了定量分析。大气中∑PAHs（气相+颗粒相）的浓度为 0.44-7.0ngm（平均值为 2.3ngm），而水中∑PAHs（溶解相）的浓度为 0.82-3.7ngL（平均值为 1.9ngL）。大气和水中的 PAHs 浓度呈现出随着纬度降低而降低的趋势。诊断比值的结果表明，气态和水中的 PAHs 可能分别与人为热和石油源最相关。PMF 模型确定了气态 PAHs 的三个来源，分别为挥发、煤和燃料油燃烧以及生物质燃烧，贡献率分别为 10%、44%和 46%。在巡航过程中，4 环 PAHs 经历了净沉积，而一些 3 环 PAHs 则主要经历了净挥发，即使在高纬度的北极地区也是如此。近海石油/天然气开采活动可能导致低分子量 3 环 PAHs 持续输入调查区域，并进一步导致它们的挥发。与气态交换通量相比，大气干沉降和气态降解通量可以忽略不计。根据外推结果，半挥发性芳香族化合物（SALCs）的气态交换可能对低纬度海洋的碳循环产生重大影响，但对高纬度海洋没有影响。
