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Short-term variations in the oxidizing power of the atmosphere

机译:大气氧化能力的短期变化

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The hydroxyl radical is the predominant atmospheric oxidant(1), responsible for removing a wide range of trace gases, including greenhouse gases, from the atmosphere. Determination of trends and variability in hydroxyl radical concentrations(2,3) is critical to understanding whether the 'cleansing' properties of the atmosphere are changing. The variability in hydroxyl radical concentrations on annual to monthly timescales, however, is difficult to quantify. Here we show records of carbon monoxide containing radiocarbon ((CO)-C-14), which is oxidized by hydroxyl radicals(4,5), from clean-air sites at Baring Head, New Zealand, and Scott Base, Antarctica, spanning 13 years. Using a model study, we correct for known variations in production of (CO)-C-14 (refs 6, 7), allowing us to exploit this species as a diagnostic for short term changes in hydroxyl radical concentrations. We find no significant long-term trend in hydroxyl radical concentrations but provide evidence for recurring short-term variations of around ten per cent persisting for a few months. We also find decreases in hydroxyl radical concentrations of up to 20 per cent, apparently triggered by the eruption of Mt Pinatubo in 1991 and by the occurrence of extensive fires in Indonesia in 1997.
机译:羟基自由基是主要的大气氧化剂(1),负责从大气中清除各种痕量气体,包括温室气体。确定羟基自由基浓度的趋势和变化性(2,3)对于了解大气的“清洁”特性是否正在变化至关重要。然而,羟基自由基浓度在每年到每月的时间尺度上的可变性很难量化。在这里,我们显示了来自新西兰Baring Head和南极洲Scott基地的清洁空气站点中包含一氧化碳的放射性碳((CO)-C-14)被羟自由基(4,5)氧化的记录。 13年。通过模型研究,我们纠正了(CO)-C-14产生的已知变化(参考文献6、7),从而使我们能够利用该物种来诊断羟基自由基浓度的短期变化。我们发现羟基自由基浓度没有明显的长期趋势,但是提供了大约10%的反复短期变化持续几个月的证据。我们还发现羟自由基浓度最多降低了20%,这显然是由于1991年皮纳图博火山爆发和1997年印度尼西亚发生大火而引发的。

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