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首页> 美国卫生研究院文献>Springer Open Choice >Persistent organochlorine pesticides and polychlorinated biphenyls in air of the North Sea region and air-sea exchange
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Persistent organochlorine pesticides and polychlorinated biphenyls in air of the North Sea region and air-sea exchange

机译：北海区域空气中的持久性有机氯农药和多氯联苯以及海气交换

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Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were studied to determine occurrence, levels and spatial distribution in the marine atmosphere and surface seawater during cruises in the German Bight and the wider North Sea in spring and summer 2009–2010. In general, the concentrations found in air are similar to, or below, the levels at coastal or near-coastal sites in Europe. Hexachlorobenzene and α-hexachlorocyclohexane (α-HCH) were close to phase equilibrium, whereas net atmospheric deposition was observed for γ-HCH. The results suggest that declining trends of HCH in seawater have been continuing for γ-HCH but have somewhat levelled off for α-HCH. Dieldrin displayed a close to phase equilibrium in nearly all the sampling sites, except in the central southwestern part of the North Sea. Here atmospheric deposition dominates the air-sea exchange. This region, close to the English coast, showed remarkably increased surface seawater concentrations. This observation depended neither on riverine input nor on the elevated abundances of dieldrin in the air masses of central England. A net depositional flux of p,p′-DDE into the North Sea was indicated by both its abundance in the marine atmosphere and the changes in metabolite pattern observed in the surface water from the coast towards the open sea. The long-term trends show that the atmospheric concentrations of DDT and its metabolites are not declining. Riverine input is a major source of PCBs in the German Bight and the wider North Sea. Atmospheric deposition of the lower molecular weight PCBs (PCB28 and PCB52) was indicated as a major source for surface seawater pollution.Electronic supplementary materialThe online version of this article (doi:10.1007/s11356-016-7530-3) contains supplementary material, which is available to authorized users.
机译：研究了有机氯农药（OCP）和多氯联苯（PCB），以确定2009-2010年春季和夏季在德国湾和更广阔的北海航行期间海洋大气和地表海水中的发生，水平和空间分布。通常，空气中的浓度与欧洲沿海或近沿海站点的水平相似或更低。六氯苯和α-六氯环己烷（α-HCH）接近相平衡，而γ-HCH的净大气沉降却被观察到。结果表明，海水中六氯环己烷的下降趋势一直在继续，但对于甲型六氯环己烷已经有所下降。狄氏剂在除北海中部西南部以外的几乎所有采样点均显示接近相平衡。在这里，大气沉积主导着海气交换。该地区靠近英吉利海沿岸，地表海水浓度显着增加。这种观察既不依赖河流输入，也不依赖英格兰中部大气中狄氏剂的丰度升高。 p，p'-DDE进入北海的净沉积通量由其在海洋大气中的丰度以及从海岸到公海的地表水中观察到的代谢物模式的变化来表明。长期趋势表明，滴滴涕及其代谢产物的大气浓度并未下降。在德国湾和更广阔的北海，河流的输入是多氯联苯的主要来源。低分子量PCBs（PCB28和PCB52）的大气沉积被认为是造成表面海水污染的主要来源。电子补充材料本文的在线版本（doi：10.1007 / s11356-016-7530-3）包含补充材料，其中适用于授权用户。

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