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Effect of Sediment Gas Voids and Ebullition on Benthic Solute Exchange

机译：沉积物空洞和空化对底栖溶质交换的影响

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摘要

The presence of free gas in sediments and ebullition events can enhance the pore water transport and solute exchange across the sediment-water interface. However, we experimentally and theoretically document that the presence of free gas in sediments can counteract this enhancement effect. The apparent diffusivities (D_a) of Rhodamine WT and bromide in sediments containing 8-1896 gas (D_(a,YE)) were suppressed by 7-3996 compared to the control (no gas) sediments (D_(a,C)). The measured ratios of D_(a,YE):D_(a,C) were well within the range of ratios predicted by a theoretical soil model for gas-bearing soils. Whereas gas voids in sediments reduce the D, for soluble species, they represent a shortcut for low-soluble species such as methane and oxygen. Therefore, the presence of even minor amounts of gas can increase the fluxes of low-soluble species (i.e., gases) by several factors, while simultaneously suppressing fluxes of dissolved species.
机译：沉积物中游离气体的存在和沸腾事件可增强孔隙水的输送和穿过沉积物-水界面的溶质交换。但是，我们从实验和理论上证明，沉积物中游离气体的存在可以抵消这种增强作用。与对照（无气体）沉积物（D_（a，C））相比，若丹明WT和溴化物在含8-1896气体（D_（a，YE））的沉积物中的表观扩散率（D_a）被抑制了7-3996。 D_（a，YE）：D_（a，C）的测得比值完全在含气土壤理论土壤模型预测的比值范围内。对于可溶物质，沉积物中的气孔会降低D，而对于甲烷和氧气等低溶物而言，它们却是捷​​径。因此，即使少量的气体的存在也可以通过几个因素增加低可溶性物质（即气体）的通量，同时抑制溶解物质的通量。

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  • 来源
    《Environmental Science & Technology》 |2015年第17期|10413-10420|共8页
  • 作者

    Sabine Flury; Ronnie N. Glud; Katrin Premke; Daniel F. McGinnis;

  • 作者单位

    Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Chemical Analytics and Biogeochemistry, Mueggelseedamm 310, 12587 Berlin, Germany,Chemical Analytics and Biogeochemistry, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany,Nordic Centre for Earth Evolution (NordCEE), University of Southern Denmark, 5230 Odense M, Denmark;

    Nordic Centre for Earth Evolution (NordCEE), University of Southern Denmark, 5230 Odense M, Denmark,Scottish Association for Marine Sciences, Scottish Marine Institute, PA37 1QA Oban, United Kingdom,Arctic Research Centre, University of Arhus, 8000 Arhus C, Denmark;

    Chemical Analytics and Biogeochemistry, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany,Institute for Landscape Biogeochemistry, Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Muencheberg, Germany;

    Chemical Analytics and Biogeochemistry, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany,Nordic Centre for Earth Evolution (NordCEE), University of Southern Denmark, 5230 Odense M, Denmark,Institute F.-A. Forel, Section of Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland;

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