Net carbon dioxide emissions from central London
Net carbon dioxide emissions from central London
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DOI：
10.1016/j.uclim.2016.10.002
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发表时间：
2018-03-01
期刊：
影响因子：
6.4
通讯作者：
Grimmond, C. S. B.
中科院分区：
文献类型：
--
作者：
Bjorkegren, A.;Grimmond, C. S. B.
城市排放的二氧化碳推动了全球大气二氧化碳浓度的增加和相关的气候变化。可以使用清单方法(汇总某一限定区域内所有已知的二氧化碳排放量和封存)和/或微气象方法(汇总通过限定的空气体积进行的二氧化碳交换，以及该体积内储存的二氧化碳总量的变化)来评估城市二氧化碳排放量。一般来说，微气象方法是首选的，它假设只有二氧化碳的净湍流垂直通量在年度时间尺度上是显著的。这项研究评估了关于二氧化碳储存和垂直平流的假设，并使用这两种方法计算了2012年6月至2013年5月伦敦市中心的净二氧化碳排放量。数据来源包括涡旋协方差系统、切换的水平和垂直二氧化碳剖面、交通计数和植被调查。年总排放量分别为51.4和53.5千克二氧化碳m(-2)y(-1)(微气象方法和清单方法)，即在4%(假设净垂直湍流通量是唯一不可忽略的微气象项的情况下为1.3%)以内。这项研究支持使用从单一地点的涡旋协方差测量计算的垂直通量来估计高密度城市环境的总排放量。(C)2017年作者。爱思唯尔出版公司(Elsevier B.V.)
Carbon dioxide (CO2) emissions from cities drive increased global atmospheric CO2 concentrations and associated climate change. Urban CO2 emissions can be evaluated using an inventory approach (summing all know emissions and sequestrations of CO2 within a defined area), and/or a micrometeorological approach (summing the exchanges of CO2 through the sides of a defined volume of air, and the change in the total stored within the volume). Generally the micrometeorological approach, with the assumption that only the net turbulent vertical flux of CO2 is significant on annual timescales, is preferred. This study evaluates that assumption with respect to storage and vertical advection of CO2, and calculates net CO2 emissions in central London using both methods for June 2012 to May 2013. Data sources include an eddy covariance system, switched horizontal and vertical CO2 profiles, traffic counts and vegetation surveys. Annual total emissions were 51.4 and 53.5 kg CO2 m(-2) y(-1) (micrometeorological and inventory methods, respectively) i.e., within 4% (1.3% with the assumption that the net vertical turbulent flux is the only non-negligible micrometeorological term). This study supports the use of vertical fluxes calculated from eddy covariance measurements at a single location to estimate total emissions from high density urban environments. (c) 2017 The Authors. Published by Elsevier B.V.