• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >RECENT INCREASE IN H2O2 CONCENTRATION AT SUMMIT, GREENLAND
【24h】

RECENT INCREASE IN H2O2 CONCENTRATION AT SUMMIT, GREENLAND

机译：格陵兰萨米特市最近H2O2浓度的增加

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Prior measurements of hydrogen peroxide (H2O2) in Greenland ice suggested a 50% increase of the H2O2 concentration during the last 200 years, where most of the increase occurred between 1960 and 1988 [Sigg and Neftel, 1991]. In this work we present data from two shallow cores drilled at Summit, Greenland in 1995 that confirm the H2O2 increase found earlier and that show a further increase of the H2O2 concentration since 1988, leading to an overall increase of 60 +/- 12% during the last 150 years. The new shallow cores were drilled 6 years after the Eurocore, which allowed us to identify the influence of the firnification process on the mean annual H2O2 concentration recorded in the firn. We found that the H2O2 concentration in the upper snow/firn decreased until the layer was buried with at least 1 m of snow and that the mean annual H2O2 concentrations in deeper layers stayed essentially unchanged. Besides the increase in the mean annual concentration, the annual amplitude between winter minima and summer maxima has tripled since 1970. Since there has been no significant change in temperature during either the last 150 years or last 25 years, it is unlikely that the increasing H2O2 concentrations are temperature related. We cannot rule out the possibility that seasonal accumulation patterns at Summit have changed, which could make a small contribution toward the increase. A small part of the increase of both the mean annual concentration and the annual amplitude of H2O2 in recent years could be due to increasing UV-B radiation caused by the depletion of stratospheric ozone, but a combination of changes in tropospheric chemistry apparently is involved. [References: 22]
机译：先前对格陵兰冰中过氧化氢（H2O2）的测量表明，过去200年中H2O2的浓度增加了50％，其中大部分增加发生在1960年至1988年之间[Sigg and Neftel，1991]。在这项工作中，我们提供了1995年在格陵兰的Summit上钻出的两个浅层岩心的数据，这些数据证实了较早发现的H2O2升高，并且表明自1988年以来H2O2的浓度进一步升高，导致在此期间整体升高60 +/- 12％。最近的150年。新的浅层岩心是在欧洲岩心之后的6年钻出的，这使我们能够确定焙烧过程对焙烧中记录的年均H2O2浓度的影响。我们发现，上层积雪/薄膜中的H2O2浓度会降低，直到该层被至少1 m的积雪掩埋为止，而深层中的年平均H2O2浓度则基本保持不变。除了平均年浓度的增加外，自1970年以来，冬季最小值和夏季最大值之间的年振幅增加了两倍。由于在过去150年或过去25年中温度没有明显变化，因此过氧化氢的增加不太可能浓度与温度有关。我们不能排除峰会的季节性积累方式改变的可能性，这可能对增加的贡献很小。近年来，H2O2的年平均浓度和年振幅增加的一小部分可能是由于平流层臭氧消耗引起的UV-B辐射增加，但显然涉及对流层化学变化的组合。 [参考：22]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号