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首页> 外文OA文献 >Linked sediment and water-column methanotrophy at a man-made gas blowout in the North Sea: Implications for methane budgeting in seasonally stratified shallow seas
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Linked sediment and water-column methanotrophy at a man-made gas blowout in the North Sea: Implications for methane budgeting in seasonally stratified shallow seas

机译：在北海的人造气体排出的人造气体井喷的联系沉积物和水柱甲蛋白酶：对季节分层浅海的甲烷预算的影响

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Large quantities of the greenhouse gas methane (CH4) are stored in the seafloor. The flux of CH4 from the sediments into the water column and finally to the atmosphere is mitigated by a series of microbial methanotrophic filter systems of unknown efficiency at highly active CH4-release sites in shallow marine settings. Here, we studied CH4-oxidation and the methanotrophic community at a high-CH4-flux site in the northern North Sea (well 22/4b), where CH4 is continuously released since a blowout in 1990. Vigorous bubble emanation from the seafloor and strongly elevated CH4 concentrations in the water column (up to 42 µM) indicated that a substantial fraction of CH4 bypassed the highly active (up to ∼2920 nmol cm−3 d−1) zone of anaerobic CH4-oxidation in sediments. In the water column, we measured rates of aerobic CH4-oxidation (up to 498 nM d−1) that were among the highest ever measured in a marine environment and, under stratified conditions, have the potential to remove a significant part of the uprising CH4 prior to evasion to the atmosphere. An unusual dominance of the water-column methanotrophs by Type II methane-oxidizing bacteria (MOB) is partially supported by recruitment of sedimentary MOB, which are entrained together with sediment particles in the CH4 bubble plume. Our study thus provides evidence that bubble emission can be an important vector for the transport of sediment-borne microbial inocula, aiding in the rapid colonization of the water column by methanotrophic communities and promoting their persistence close to highly active CH4 point sources.
机译：大量的温室气体甲烷（CH4）储存在海底。通过在浅海洋环境中的高活性CH 4释放位点，通过一系列未知效率的微生物甲坯过滤系统减轻了从沉积物到水柱中并最终到大气中的通量。在这里，我们在北部北海的高CH4 - 通量部位（22 / 4B）的高CH4助焊位点进行了CH4氧化和甲虫植物群，其中CH4是在1990年井喷后连续释放的。来自海底剧烈的泡沫散发在水柱中（高达42μM）升高浓度的CH 4表明，CH4的实质部分绕过了高活性（高达~2920纳摩尔厘米-3 d-1）厌氧CH4氧化的沉积物区域。在水柱中，我们测量了在海洋环境中衡量的最高测量中的有氧CH4-氧化（高达498nm D-1）的速率，并且在分层条件下有可能去除占有的重要部分CH4在逃到大气之前。通过II型甲烷氧化细菌（MOB）的水柱甲蛋白的不寻常优势被沉积物募集部分地支撑，其与CH 4气泡羽流中的沉积物颗粒夹带。因此，我们的研究提供的证据表明，气泡排放可以是用于沉积物源性微生物菌剂的传输的重要载体，辅助在由甲烷社区水柱的迅速定殖，促进其持久性接近高活性CH4点源。

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