...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >High-Precision Measurement of N_2O Concentration in Ice Cores
【24h】

High-Precision Measurement of N_2O Concentration in Ice Cores

机译：高精度测量冰芯中N_2O的浓度

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

src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b05250/20180111/images/medium/es-2017-05250p_0005.gif">Atmospheric nitrous oxide (N2O) is a greenhouse gas and ozone-depleting substance whose emissions are substantially perturbed by current human activities. Although air trapped in polar ice cores can provide direct information about N2O evolution, analytical precision was not previously sufficient for high temporal resolution studies. In this work, we present a highly improved analytical technique with which to study N2O concentrations in ancient-air-trapped ice cores. We adopt a melt–refreezing method to extract air and use a gas chromatography–electron capture detector (GC–ECD) to determine N2O concentrations. The GC conditions are optimized to improve the sensitivity for detecting N2O. Retrapped N2O in ice during the extraction procedure is precisely analyzed and corrected. We confirmed our results using data from the Styx Glacier ice core in Antarctica by comparing them with the results of a dry-extraction method. The precision estimated from the pooled standard deviation of replicated measurements of the Styx ice core was 1.5 ppb for ∼20 g of ice, a smaller sample of ice than was used in previous studies, showing a significant improvement in precision. Our preliminary results from the Styx Glacier ice core samples have the potential to define small N2O variations (a few parts per billion) at centennial time scales.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b05250/20180111/images/medium /es-2017-05250p_0005.gif“>大气中的一氧化二氮（N 2 O）是一种温室气体和消耗臭氧层的物质，其排放量受到当前人类活动的严重干扰。尽管困在极地冰芯中的空气可以提供有关N 2 O演变的直接信息，但分析精度以前不足以用于高时间分辨率研究。在这项工作中，我们提出了一种高度改进的分析技术，可用于研究古代被困在空气中的冰芯中N 2 O的浓度。我们采用熔融-再冷冻方法提取空气，并使用气相色谱-电子捕获检测器（GC-ECD）测定N 2 O的浓度。优化了GC条件，以提高检测N 2 O的灵敏度。萃取过程中冰中重新捕获的N 2 O进行了精确的分析和校正。我们通过将南极的Styx冰川冰芯数据与干法提取的结果进行比较，证实了我们的结果。根据Styx冰芯重复测量的合并标准偏差估计的精度，对于约20 g的冰，其精度为1.5 ppb，比以前的研究中使用的冰样小，显示出精度的显着提高。我们从Styx冰川冰芯样本获得的初步结果有可能在百年时间尺度上定义较小的N 2 O变化（十亿分之几）。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第2期|731-738|共8页
  • 作者

    Yeongjun Ryu; Jinho Ahn; Ji-Woong Yang;

  • 作者单位

    School of Earth and Environmental Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul Republic of Korea;

    School of Earth and Environmental Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul Republic of Korea;

    School of Earth and Environmental Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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