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A record of atmospheric halocarbons during the twentieth century from polar firn air

机译：极地燃烧空气中20世纪大气中卤代烃的记录

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Measurements of trace gases in air trapped in polar firn (unconsolldated snow) demonstrate that natural sources of chlorofluorocarbons, halons, persistent chlorocarbon solvents and sulphur hexafluorlde to the atmosphere are minimal or non-existent. Atmospheric concentrations of these gases, reconstructed back to the late nineteenth century, are consistent with atmospheric histories derived from anthropogenic emission rates and known atmospheric lifetimes. The measurements confirm the predominance of human activity in the atmospheric budget of organic chlorine, and allow the estimation of atmospheric histories of halogenated gases of combined anthropogenic and natural origin. The pre-twentieth-century burden of methyl chloride was close to that at present, while the burden of methyl bromide was probably over half of today's value.
机译：测量极地火焰（未融化的雪）中捕获的空气中的痕量气体表明，向大气中释放的氯氟烃，哈龙，持久性氯烃溶剂和六氟化硫的天然来源很少或不存在。这些气体的大气浓度可以追溯到19世纪后期，与人为排放速率和已知大气寿命得出的大气历史一致。这些测量证实了人类活动在有机氯的大气预算中占主导地位，并允许估算人为和自然起源相结合的卤代气体的大气历史。二十世纪前的甲基氯负担已接近目前的水平，而甲基溴的负担可能已超过当今价值的一半。

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