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课题组在西太平洋至南大洋 (17.5°N to 69.2°S) 开展了多环芳烃 (PAHs) 长距离传输特征及来源解析相关研究，研究结果表明PAHs水平分布呈明显纬度差异——即中纬度海区递增、高纬度海区递减，垂直剖面呈现表层富集、随深度递减的特征。首次估算了普利兹湾海水中PAHs储量，揭示中、深层海水为其主要储库，持续的气候变化与PAH释放或可改变未来极地持久性有机污染物 (POPs) 的源汇格局。相关文章《Fate of polycyclic aromatic hydrocarbons in seawater from the western pacific to the Southern Ocean (17.5°N to 69.2°S) and their inventories on the Antarctic Shelf》于2016年8月发表于环境科学Top期刊《Environmental Science & Technology》。
Figure 1. Concentrations of dissolved PAHs (ng L−1) in the surface seawater along the cruise path.
Figure 2. Concentrations of dissolved PAHs (ng L−1) in surface seawater from Prydz Bay.
Figure 3. Vertical profile (0−500 m depth) of dissolved Σ9PAH (ng L−1) (a), dissolved oxygen (mg L−1) (b), and chlorophyll (arbitrary unit) (c) in seawater columns from Prydz Bay. |
Abstract: Semivolatile organic compounds such as polycyclic aromatic hydrocarbons (PAHs) have the potential to reach pristine environments through long-range transport. To investigate the longrange transport of the PAHs and their fate in Antarctic seawater, dissolved PAHs in the surface waters from the western Pacific to the Southern Ocean (17.5°N to 69.2°S), as well as down to 3500 m PAH profiles in Prydz Bay and the adjacent Southern Ocean, were observed during the 27th Chinese National Antarctic Research Expedition in 2010. The concentrations of Σ9PAH in the surface seawater ranged from not detected (ND) to 21 ng L−1, with a mean of 4.3 ng L−1; and three-ring PAHs were the most abundant compounds. Samples close to the Australian mainland displayed the highest levels across the cruise. PAHs originated mainly from pyrogenic sources, such as grass, wood, and coal combustion. Vertical profiles of PAHs in Prydz Bay showed a maximum at a depth of 50 m and less variance with depth. In general, we inferred that the water masses as well as the phytoplankton were possible influencing factors on PAH surface-enrichment depth-depletion distribution. Inventory estimation highlighted the contribution of intermediate and deep seawater on storing PAHs in seawater from Prydz Bay, and suggested that climate change rarely shows the rapid release of the PAHs currently stored in the major reservoirs (intermediate and deep seawater).
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