Greenhouse gas measurements from a UK network of tall towers: technical description and first results
Greenhouse gas measurements from a UK network of tall towers: technical description and first results
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DOI：
10.5194/amt-11-1437-2018
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发表时间：
2017-10
影响因子：
3.8
通讯作者：
K. Stanley;A. Grant;S. O'Doherty;D. Young;A. Manning;A. Stavert;T. G. Spain;P. Salameh;C. Harth;P. Simmonds;W. Sturges;D. Oram;Richard G. Derwent
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文献类型：
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作者：
K. Stanley;A. Grant;S. O'Doherty;D. Young;A. Manning;A. Stavert;T. G. Spain;P. Salameh;C. Harth;P. Simmonds;W. Sturges;D. Oram;Richard G. Derwent
抽象的。2012年在联合王国各地建立了一个由三个高塔测量站组成的网络，以扩大在爱尔兰梅斯黑德的长期背景北方半球站点进行的测量。在英国的三个地点开发和部署了可靠和精确的原位温室气体（GHG）分析系统，并使用自动化仪器测量一套GHG。英国衍生排放与气候变化（英国DECC）网络使用高（165-230米）开放式网格电信塔，为边界层痕量气体采样提供了一个方便的平台。在本文中，我们描述了自动化测量系统和第一个结果从英国DECC网络的CO2，CH 4，N2 O，SF6，CO和H2。CO2和CH 4测量在所有的英国DECC网站的空腔衰荡光谱（CRDS）与多个入口高度在两个三个高塔网站，以评估边界层分层。2012年1月至2015年9月背景摩尔分数下CRDS测量的短期精度（1σ/1 min平均值）为：网络中的仪器是完全自动化的，包括用于测量各种仪器参数（如流量、压力和采样温度）的传感器。当仪器参数不在规定的设定范围内时，将生成自动警报并通过电子邮件发送给现场操作员。如果出现严重错误（如载气流速偏差），则会自动关闭仪器。该网络的结果提供了自2012年初以来英国境内大气混合比的良好时空覆盖。结果还表明，在选定的报告期内，所有测量的温室气体的摩尔分数都在增加，除SF6外，都呈现出季节性趋势。CO2和CH 4也表现出较强的昼夜循环，夜间最大值和白天最小值的摩尔分数。
Abstract. A network of three tall tower measurement stations was set up in 2012 across the United Kingdom to expand measurements made at the long-term background northern hemispheric site, Mace Head, Ireland. Reliable and precise in situ greenhouse gas (GHG) analysis systems were developed and deployed at three sites in the UK with automated instrumentation measuring a suite of GHGs. The UK Deriving Emissions linked to Climate Change (UK DECC) network uses tall (165–230 m) open-lattice telecommunications towers, which provide a convenient platform for boundary layer trace gas sampling. In this paper we describe the automated measurement system and first results from the UK DECC network for CO2, CH4, N2O, SF6, CO and H2. CO2 and CH4 are measured at all of the UK DECC sites by cavity ring-down spectroscopy (CRDS) with multiple inlet heights at two of the three tall tower sites to assess for boundary layer stratification. The short-term precisions (1σ on 1 min means) of CRDS measurements at background mole fractions for January 2012 to September 2015 is Instrumentation in the network is fully automated and includes sensors for measuring a variety of instrumental parameters such as flow, pressures, and sampling temperatures. Automated alerts are generated and emailed to site operators when instrumental parameters are not within defined set ranges. Automated instrument shutdowns occur for critical errors such as carrier gas flow rate deviations. Results from the network give good spatial and temporal coverage of atmospheric mixing ratios within the UK since early 2012. Results also show that all measured GHGs are increasing in mole fraction over the selected reporting period and, except for SF6, exhibit a seasonal trend. CO2 and CH4 also show strong diurnal cycles, with night-time maxima and daytime minima in mole fractions.