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首页> 外文期刊>Oceanographic Literature Review >Terrestrial inputs govern spatial distribution of polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) in an Arctic fjord system (Isfjorden, Svalbard)
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Terrestrial inputs govern spatial distribution of polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) in an Arctic fjord system (Isfjorden, Svalbard)

机译：地面输入在北极峡湾系统中治理多氯联苯（PCB）和六氯苯（HCB）的空间分布（Isfjorden，Svalbard）

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Considerable amounts of previously deposited persistent organic pollutants (POPs) are stored in the Arctic cryosphere. Transport of freshwater and terrestrial material to the Arctic Ocean is increasing due to ongoing climate change and the impact this has on POPs in marine receiving systems is unknown This study has investigated how secondary sources of POPs from land influence the occurrence and fate of POPs in an Arctic coastal marine system. Passive sampling of water and sampling of riverine suspended paniculate matter (SPM) and marine sediments for analysis of polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) was carried out in rivers and their receiving fjords in Isfjorden system in Svalbard. Riverine SPM had low contaminant concentrations (＜level of detection-28 pg/g dw ΣPCB_(14), 16-100 pg/g dw HCB) compared to outer marine sediments 630-880 pg/g dw ΣPCB_(14), 530-770 pg/g dw HCB). There was a strong spatial gradient in sediment PCB and HCB concentrations with lowest concentrations in river estuaries and in front of marine-terminating glaciers and increasing concentrations toward the outer fjord. This suggests that rather than leading to increased concentrations, inputs of SPM from land lead to a dilution of contaminant concentrations in nearshore sediments. Preliminary estimates of SPM:water activity ratios suggest that terrestrial particles (with low contaminant concentrations) may have the potential to act as sorbents of dissolved contaminants in the coastal water column, with implications for bioavailability of POPs to the marine food web. There is concern that ongoing increases in fluxes of freshwater, sediments and associated terrestrial material (including contaminants) from land to the Arctic Ocean will lead to increased mobilization and transport of POPs to coastal ecosystems. However, the results of this study indicate that on Svalbard, inputs from land may in fact have the opposite effect, leading to reduced concentrations in coastal sediments and waters.
机译：大量预沉积的持久性有机污染物（POPs）储存在北极冰区中。由于持续的气候变化，淡水和陆地材料的运输正在增加，由于持续的气候变化，这对海洋接收系统的持久性的影响是未知本研究的研究已经研究了土地的流行持久性的二级来源如何影响一个流行的流行的发生和命运北极沿海海洋系统。河流在斯瓦尔巴特中的河流和六氯苯基（PCB）和六氯苯（PCB）和六氯苯（HCB）中进行水和河流悬浮的胰腺物质（SPM）和海洋沉积物的被动取样及海洋沉积物。与外海洋沉积物相比，河流SPM具有低污染物浓度（<检测水平-28pg / gdwσpcb_（14），16-100pg / g dw hcb）630-880 pg / gdwΣpcb_（14），530- 770 pg / g dw hcb）。在沉积物PCB和HCB浓度中，河流河口中最低浓度和海洋终端冰川前面以及向外峡湾的浓度增加，有一个强烈的空间梯度。这表明这不是导致增加浓度，从土地的SPM输入导致近岸沉积物中的污染物浓度稀释。 SPM的初步估计：水活性比表明，陆地颗粒（具有低污染物浓度）可能具有沿海水柱中溶解污染物的吸附剂的潜力，具有对海洋食品网的生物利用度的影响。担心从陆地到北冰洋的淡水，沉积物和相关陆地材料（包括污染物）的持续增加将导致流行流行沿海生态系统的动员和运输增加。然而，本研究的结果表明，在斯瓦尔巴特，土地的投入实际上有相反的效果，导致沿海沉积物和水域的浓度降低。

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    《Oceanographic Literature Review》 |2021年第5期|1092-1092|共1页
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