• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Measurement of Atmospheric Ozone by Cavity Ring-down Spectroscopy
【24h】

Measurement of Atmospheric Ozone by Cavity Ring-down Spectroscopy

机译：腔衰荡光谱法测量大气臭氧

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

Ozone plays a key role in both the Earth's radiative budget and photochemistry. Accurate, robust analytical techniques for measuring its atmospheric abundance are of critical importance. Cavity ring-down spectroscopy has been successfully used for sensitive and accurate measurements of many atmospheric species. However, this technique has not been used for atmospheric measurements of ozone, because the strongest ozone absorption bands occur in the ultraviolet spectral region, where Rayieigh and Mie scattering cause significant cavity losses and dielectric mirror reflectivities are limited. Here, we describe a compact instrument that measures O_3 by chemical conversion to NO_2 in excess NO, with subsequent detection by cavity ring-down spectroscopy. This method provides a simple, accurate, and high-precision measurement of atmospheric ozone. The instrument consists of two channels. The sum of NO_2 and converted O_3 (defined as Ox) is measured in the first channel, while NO_2 alone is measured in the second channel. NO_2 is directly detected in each channel by cavity ring-down spectroscopy with a laser diode light source at 404 nm. The limit of detection for O_3 is 26 pptv (2 sigma precision) at 1 s time resolution. The accuracy of the measurement is ±2.2%, with the largest uncertainty being the effective NO_2 absorption cross-section. The linear dynamic range of the instrument has been verified from the detection limit to above 200 ppbv (r2 > 99.99%). The observed precision on signal (2 sigma) with 41 ppbv O_3 is 130 pptv in 1 s. Comparison of this instrument to UV absorbance instruments for ambient O_3 concentrations shows linear agreement (r2 = 99.1%) with slope of 1.012 ± 0.002.
机译：臭氧在地球的辐射预算和光化学中都起着关键作用。准确，稳健的分析技术对其大气丰度的测量至关重要。腔衰荡光谱已成功用于许多大气物种的灵敏和准确的测量。但是，该技术尚未用于臭氧的大气测量，因为最强的臭氧吸收带出现在紫外线光谱区域，该区域的Rayieigh和Mie散射会导致显着的腔体损耗，并且介电镜反射率受到限制。在这里，我们描述了一种紧凑的仪器，该仪器通过将化学转化为过量NO的NO_2来测量O_3，随后通过腔衰荡光谱法对其进行检测。该方法提供了一种简单，准确和高精度的大气臭氧测量方法。仪器包含两个通道。在第一通道中测量NO_2和转换后的O_3（定义为Ox）的总和，而在第二通道中单独测量NO_2。通过腔衰荡光谱用激光二极管光源在404 nm处直接检测每个通道中的NO_2。在1 s的时间分辨率下，O_3的检测极限为26 pptv（2 sigma精度）。测量精度为±2.2％，最大不确定度是有效NO_2吸收截面。仪器的线性动态范围已从检出限验证到高于200 ppbv（r2> 99.99％）。在1 s内以41 ppbv O_3观察到的信号精度（2 sigma）为130 pptv。该仪器与环境O_3浓度的紫外吸收仪器的比较显示出线性一致性（r2 = 99.1％），斜率为1.012±0.002。

著录项

  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2938-2944|共7页
  • 作者

    R. A. Washenfelder; N. L. Wagner; W. P. Dube; S. S. Brown;

  • 作者单位

    Cooperative Institute for Research in Environmental Sciences, 216 UCB, University of Colorado, Boulder, Colorado 80309, United States,Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway,Boulder, Colorado 80305, United States;

    Cooperative Institute for Research in Environmental Sciences, 216 UCB, University of Colorado, Boulder, Colorado 80309, United States,Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway,Boulder, Colorado 80305, United States;

    Cooperative Institute for Research in Environmental Sciences, 216 UCB, University of Colorado, Boulder, Colorado 80309, United States,Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway,Boulder, Colorado 80305, United States;

    Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway,Boulder, Colorado 80305, United States;

  • 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