Seasonal Variations in Hydrogen Peroxide in Polar Ice Cores
Seasonal Variations in Hydrogen Peroxide in Polar Ice Cores
复制标题
极地冰芯中过氧化氢的季节变化
DOI：
10.3189/s0260305500004353
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发表时间：
1988
影响因子：
2.9
通讯作者：
A. Neftel
中科院分区：
文献类型：
--
作者：
A. Sigg;A. Neftel
过氧化氢在极地冰雪中的浓度非常高。H2 O2的含量高达300 ppb，是极地冰中浓度最高的杂质之一。我们提出了一个连续的H2 O2积雪记录从Siple站（南极洲），它涵盖了过去83年的分辨率为10-20个样本，每年。这一记录具有很强的季节性。在Dye 3的格陵兰冰芯中也观察到了这种季节性，在那里我们以相同的分辨率连续测量了顶部10米。最大浓度对应于夏季积雪层，并可超过冬季积雪浓度的10倍。这一特性使得H2 O2成为一种有用的示踪剂，通过计算年层来确定合适的岩心的年代。不同的步骤需要相关的大气冰核H2 O2浓度进行了讨论。与同位素示踪剂一样，在积雪中的扩散平滑了原始的H2 O2浓度分布。
Hydrogen peroxide is present in polar snow and ice in remarkably high concentrations. With values up to 300 ppb, H2O2 is one of the most concentrated impurities in polar ice. We present a continuous H2O2 firn record from Siple Station (Antarctica); it covers the last 83 years with a resolution of 10–20 samples per year. A very strong seasonality is present in this record. This seasonality is also observed in a Greenland ice core from Dye 3, where we have continuously measured the top 10 m with the same resolution. The maximum concentrations correspond to summer snow layers and can exceed winter snow concentrations by a factor of 10. This property makes H2O2 a useful tracer for dating suitable cores by counting annual layers. The different steps needed to relate the atmospheric to the ice–core H2O2 concentration are discussed. As with isotopic tracers, diffusion in the firn smooths the original H2O2 concentration profile.