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首页> 外文期刊>Journal of oceanography >Spatial distribution of dissolved methane and its source in the western Arctic Ocean
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Spatial distribution of dissolved methane and its source in the western Arctic Ocean

机译：北冰洋西部溶解性甲烷及其来源的空间分布

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Recent Arctic warming and decreasing sea-ice can promote the release of methane (CH4), a greenhouse gas, from the Arctic Ocean, thereby providing a strong climate feedback. However, the dynamics of dissolved CH4 in the Arctic Ocean remain uncertain, especially in western areas. This report describes the horizontal and vertical distributions of concentration and stable carbon isotope ratio (delta C-13 value) of CH4 in the western Arctic Ocean. Surface layer samples used for this study were supersaturated with CH4 in comparison to the atmosphere. Especially high CH4 concentrations (up to 10.3 nmol kg(-1)) were observed at stations in the continental shelf area. At the bottom layer of the shelf stations, the CH4 concentration was higher (up to 55.9 nmol kg(-1)). Its delta C-13 value was lower (down to - 63.8aEuro degrees) than in the surface layer, which suggests that CH4 in the shelf water is produced mainly by methanogens in sediment. At deeper stations in the Canada Basin (seafloor 300 m depth), the maxima of CH4 concentration were detected at depths of 10-50 m and 100-200 m, although delta C-13 values were lowest at 50 m depth. The shallower CH4 maximum coincided with the DO maximum, suggesting CH4 production by plankton activity or sinking particles. The deeper CH4 maximum corresponded to the nutrient maximum, suggesting horizontal advection of shelf water from the coastal shelf area. From the results, we were able to confirm that the dynamics of dissolved CH4 in the western Arctic Ocean in summer 2012 varied with area and depth.
机译：近期北极变暖和海冰减少可促进北冰洋释放甲烷（CH4）（一种温室气体），从而提供强大的气候反馈。但是，北冰洋中溶解的CH4的动力学仍然不确定，尤其是在西部地区。该报告描述了北冰洋西部CH4的浓度和稳定碳同位素比（δC-13值）的水平和垂直分布。与大气相比，用于本研究的表面层样品被CH4过饱和。在大陆架区域的站点观测到特别高的CH4浓度（高达10.3 nmol kg（-1））。在架子工位的底层，CH4浓度较高（高达55.9 nmol kg（-1））。其δC-13值比表层低（低至-63.8aEuro度），这表明架子水中的CH4主要由沉积物中的产甲烷菌产生。在加拿大盆地的较深站（海底> 300 m深度），在10-50 m和100-200 m的深度处检测到CH4浓度的最大值，尽管在50 m深度处的C-13值最低。较浅的CH4最大值与DO最大值重合，表明浮游生物活动或沉没颗粒产生CH4。 CH4最大值越深，对应的养分最大值就越多，表明来自沿海陆架区的陆架水水平对流。从结果可以确定，2012年夏季北冰洋西部溶解的CH4的动力学随面积和深度而变化。

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