Development of a method for estimating methane gas emissions at high resolution
Development of a method for estimating methane gas emissions at high resolution
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开发一种高分辨率估算甲烷气体排放量的方法
DOI：
10.17863/cam.8568
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发表时间：
2016
影响因子：
5.2
通讯作者：
S. Connors
中科院分区：
文献类型：
--
作者：
S. Connors
甲烷是第二重要的人为温室气体，其辐射变暖为0.97 [0.74-1.20] W m（Stocker等人，2013 a），以及在100年的时间尺度上，全球变暖潜力是CO2的21倍（雷伊等人，2010年）。它对气候变化的意义是重大的，而我们目前对它的源和汇的理解和量化还不够完整。本论文阐述了高空间分辨率甲烷排放估算新技术的发展。越来越需要对使用自下而上和自上而下技术得出的排放量估计数进行比较。针对这一点，反演方法，InTEM，被改编为估计在高空间分辨率的英格兰东部的甲烷排放量。InTEM将现场大气甲烷测量和计算机分散建模纳入统计技术。甲烷排放量估计推断使用模拟退火方法内的成本函数分析。本论文介绍的结果涵盖了两年的时间（2012年7月至2014年6月），其中大气甲烷浓度记录在1 - 2分钟的时间步长在东安格利亚四个地点。除了一个使用Picarro腔衰荡光谱（CRDS）仪器的站点外，所有站点都使用带有相同电离检测器（GC-FID）的气相色谱仪进行精确测量。英国气象局的NAME扩散模型在InTEM中使用，以代表在此期间发生的物理大气过程。甲烷浓度的变化在不同的时间框架，并依赖于各种气象变量，特别是边界层高度和风速。对Haddenham现场甲烷浓度的案例研究显示了当地陆地来源的影响。对整个空气样本的同位素分析显示，哈登汉姆站的δC同位素信号为-58.3 ±2，附近陆地11的δC同位素信号为-59.2 ±2。英格兰东部的排放量估计是在不同的空间分辨率，年度和季节的时间框架计算的。县级甲烷排放
Methane is the second most important anthropogenic greenhouse gas, with a radiative warming of 0.97 [0.74-1.20] W m (Stocker et al., 2013a) and a global warming potential of 21 times that of CO2 over a 100 year timescale (Reay et al., 2010). Its signi cance to climate change is signi cant whereas our current understanding and quanti cation of its sources and sinks lack completeness. This thesis explains the development of novel technique to estimate methane emissions at high spatial resolution. There is a growing need for comparisons between emission estimates produced using bottom-up and top-down techniques. In response to this, an inversion approach, InTEM, was adapted to estimate methane emissions for the East of England at high spatial resolution. InTEM incorporates in situ atmospheric methane measurements and computer dispersion modelling into a statistical technique. Methane emission estimates are inferred using cost function analysis within a simulated annealing method. This thesis presents results covering a two year period (July 2012 June 2014) in which atmospheric methane concentrations were recorded at 1 2 minute time steps at four locations within East Anglia. Precise measurements are obtained using gas chromatographs with ame ionisation detectors (GC-FID) for all sites except one, which uses a Picarro cavity ring down spectroscopy (CRDS) instrument. The UK Met O ce's NAME dispersion model is used within InTEM to represent the physical atmospheric processes which occur throughout this period. Methane concentrations are shown to vary over di erent time frames and are dependent on various meteorological variables, particularly boundary layer height and wind speed. A case study into methane concentration at the Haddenham site shows in uence from local land ll sources. Isotopic analysis from whole air samples give a δC isotopic signal of -58.3 ±2 at the Haddenham site and -59.2 ±2 at the nearby land ll. Emission estimates for the East of England are calculated at varying spatial resolutions, on annual and seasonal time frames. County scale methane emission
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影响因子：
6.3
作者：
Ganesan, A. L.;Manning, A. J.;O'Doherty, S.
通讯作者：
O'Doherty, S.
影响因子：
4.3
作者：
Keppler, Frank;Boros, Mihaly;Schnitzler, Joerg-Peter
通讯作者：
Schnitzler, Joerg-Peter
影响因子：
4.9
作者：
Carslaw, David C.;Ropkins, Karl
通讯作者：
Ropkins, Karl
影响因子：
6.3
作者：
Ganesan, A. L.;Rigby, M.;Weiss, R. F.
通讯作者：
Weiss, R. F.