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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Methyl bromide, other brominated methanes, and methyl iodide in polar firn air
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Methyl bromide, other brominated methanes, and methyl iodide in polar firn air

机译：极性燃烧空气中的甲基溴，其他溴化甲烷和甲基碘

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We report measurements of brominated, bromochlorinated, and iodinated methanes in air extracted from deep firn at three polar locations (two Antarctic and one Arctic). Using a firn diffusion model, we are able to reconstruct a consistent temporal trend for methyl bromide from the two Antarctic sites. This indicates a steady increase by about 2 ppt from the midtwentieth century to 8 ppt today. The Arctic firn, however, contained extremely high levels of methyl bromide as well as numerous other organic gases, which are evidently produced in situ. The other brominated species (dibromomethane, bromochloromethane, bromodichloromethane, dibromochloromethane, and bromoform) showed Little or no long-term trend in Antarctic firn and therefore are evidently of entirely natural origin in the Southern Hemisphere. A clear seasonal trend was observed in the upper firn for the shortest-lived halocarbons (notably bromoform and methyl iodide). The same species were present at lower abundance at the higher altitude and more inland Antarctic site, possibly due to their origin from more distant oceanic sources. [References: 34]
机译：我们报告了在三个极地（两个南极和一个北极）从深层火星提取的空气中的溴化，溴氯化和碘化甲烷的测量值。使用弗恩扩散模型，我们能够从两个南极站点重建一致的甲基溴时间趋势。这表明从20世纪中叶到现在的8个百分点左右稳定增长。但是，北极炉中含有极高含量的甲基溴以及许多其他有机气体，这些气体显然是在原地产生的。其他溴化物种（二溴甲烷，溴氯甲烷，溴二氯甲烷，二溴氯甲烷和溴仿）在南极鱼类中显示很少或没有长期趋势，因此显然是南半球的完全自然起源。寿命最短的卤代烃（尤其是溴仿和甲基碘）在上部烧成中观察到明显的季节性趋势。同一物种在较高海拔和更多内陆南极地点以较低的丰度存在，可能是由于它们起源于更远的海洋来源。 [参考：34]

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