...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Science of the Total Environment >Applicability of a gas analyzer with dual quantum cascade lasers for simultaneous measurements of N_2O, CH_4 and CO_2 fluxes from cropland using the eddy covariance technique
【24h】

Applicability of a gas analyzer with dual quantum cascade lasers for simultaneous measurements of N_2O, CH_4 and CO_2 fluxes from cropland using the eddy covariance technique

机译：气体分析仪对双量子级联激光器的适用性，用于使用涡流协方差技术同时测量来自农田的N_2O，CH_4和CO_2助焊剂

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

We evaluated the applicability of a closed-path gas analyzer with two mid-infrared quantum cascade lasers (QCLs) for simultaneous measurement of nitrous oxide (N_2O). methane (CH_4) and carbon dioxide (CO_2) fluxes from a cropland using the eddy covariance (EC) technique. The measurements were carried out in a typical vegetable field in the subtropical China during the wintertime, when the gas fluxes are at their lowest level in the year. A new approach was proposed to optimize the determination of lag times between the wind and gas concentration data, which was proven efficient to increase the reliability of the measured fluxes when the gas exchanges are weak. The dual-QCL analyzer showed a median precision (1σ) of 0.14 nmol mol~(-1) for N_2O, 33 nmol mol~(-1) for CH_4 and 0.36 μmol mol~(-1) for CO_2 at sampling frequency of 10 Hz under the field conditions. Such precisions are better than, or comparable with, those of other commonly used closed-path or open-path gas analyzers, which are capable of measuring ony one or two ot the three gases. The detection limit of the EC system for measuring half-hourly fluxes were 0.05 nmol m~(-2) s~(-1) for N_2O,1.12 nmol m~(-2) s~(-1) for CH_4 and 0.14 μmol m~(-2-) s~(-1) for CO_2. The results showed that 100% of the N_2O,85% of the CH_4 and 96% of the CO_2 fluxes were larger than the above detection limits. This study suggests that the EC technique using a closed-path gas analyzer with two quantum cascade lasers is qualified for reliable and simultaneous measurements of N_2O, CH_4 and CO_2 fluxes from a subtropical cropland throughout the year. Moreover, EC method based on this type of gas analyzer provides an additional option for long-term and simultaneous flux measurements of the three greenhouse gases in a wide range of agricultural and natural ecosystems.
机译：我们评估了闭路气体分析仪与两个中红外量子级联激光器（QCLS）的适用性，用于同时测量氧化亚氮（N_2O）。使用涡流协方差（EC）技术，来自农田的甲烷（CH_4）和二氧化碳（CO_2）通量。当气体势态在当年的最低水平时，在冬季中国的亚热带中国的典型蔬菜场中进行了测量。提出了一种新的方法，以优化风和气体浓度数据之间的滞后时间的测定，这被证明是有效的，以增加当气体交换较弱时测量的助熔剂的可靠性。双QCL分析仪对于N_2O，33nmol Mol〜（-1）的N_2O，33nmol Mol〜（-1）的中值精度（1σ），用于CH_4和0.36μmolmol〜（-1），用于在10的采样频率下进行CO_2 Hz在现场条件下。这种精度优于或与其他常用的闭合路径或开放式气体分析仪的矫正器更好，能够测量三个气体的ONY一或两个。用于测量半小时助熔剂的EC系统的检测极限为N_2O，1.12 Nmol M〜（-2）S〜（-1）的0.05 nmol m〜（-2）S〜（-1），用于CH_4和0.14μmol CO_2的M〜（-2-）S〜（-1）。结果表明，100％的N_2O，85％的CH_4和96％的CO_2助熔剂大于上述检测限。该研究表明，使用具有两个量子级联激光器的闭路气体分析仪的EC技术有资格获得全年从亚热带农作物的N_2O，CH_4和CO_2势量的可靠和同时测量。此外，基于这种气体分析仪的EC方法为三种温室气体中的长期和同时通量测量提供了另外的选择，包括各种农业和自然生态系统。

著录项

  • 来源
    《The Science of the Total Environment》 |2020年第10期|138784.1-138784.15|共15页
  • 作者

    Dong Wang; Kai Wang; Xunhua Zheng; Klaus Butterbach-Bahl; Eugenio Diaz-Pines; Han Chen;

  • 作者单位

    State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences (IAP-CAS) Beijing 100029 China College of Earth and Planetary Science University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences (IAP-CAS) Beijing 100029 China;

    State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences (IAP-CAS) Beijing 100029 China College of Earth and Planetary Science University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences (IAP-CAS) Beijing 100029 China Institute of Meteorology and Climate Research Atmospheric Environmental Research Karlsruhe Institute of Technology 82467 Garmisch-Partenkirchen Germany;

    Institute of Meteorology and Climate Research Atmospheric Environmental Research Karlsruhe Institute of Technology 82467 Garmisch-Partenkirchen Germany Institute of Soil Research University of Natural Resources and Life Sciences (BOKU) Vienna Austria;

    College of Environmental Science and Engineering/Sino-Canada Joint R&D Centre for Water and Environment Safety Nankai University Tianjin 300071 China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nitrous oxide; Methane; Carbon dioxide; Flux; Quantum cascade laser; Eddy covariance; Cropland;

    机译：笑气;甲烷;二氧化碳;助焊剂;量子级联激光;埃迪协方差;田间;

相似文献

  • 外文文献
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