DOI: 10.1016/j.atmosenv.2015.10.012
Scopus记录号: 2-s2.0-84945315982
论文题名: CO2 emission estimation in the urban environment: Measurement of the CO2 storage term
作者: Bjorkegren A ; B ; , Grimmond C ; S ; B ; , Kotthaus S ; , Malamud B ; D
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122 起始页码: 775
结束页码: 790
语种: 英语
英文关键词: Carbon dioxide
; CO2 profile
; CO2 storage
; Urban environment
; Wavelet analysis
Scopus关键词: Boundary layers
; Carbon
; Computer integrated manufacturing
; Digital storage
; Thermal expansion
; Time series
; Urban planning
; Wavelet analysis
; Concentration profiles
; Continuous measurements
; Emission estimation
; Empirical method
; Sampling frequencies
; Temporal interpolation
; Urban environments
; Vertical profile
; Carbon dioxide
; carbon dioxide
; boundary layer
; carbon dioxide
; carbon sequestration
; concentration (composition)
; data set
; eddy covariance
; emission inventory
; frequency analysis
; interpolation
; street canyon
; urban atmosphere
; vertical profile
; wavelet analysis
; Article
; boundary layer
; gas
; measurement
; priority journal
; time series analysis
; urban area
; England
; London [England]
; United Kingdom
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Eddy covariance has been used in urban areas to evaluate the net exchange of CO2 between the surface and the atmosphere. Typically, only the vertical flux is measured at a height 2-3 times that of the local roughness elements; however, under conditions of relatively low instability, CO2 may accumulate in the airspace below the measurement height. This can result in inaccurate emissions estimates if the accumulated CO2 drains away or is flushed upwards during thermal expansion of the boundary layer. Some studies apply a single height storage correction; however, this requires the assumption that the response of the CO2 concentration profile to forcing is constant with height. Here a full seasonal cycle (7th June 2012 to 3rd June 2013) of single height CO2 storage data calculated from concentrations measured at 10 Hz by open path gas analyser are compared to a data set calculated from a concurrent switched vertical profile measured (2 Hz, closed path gas analyser) at 10 heights within and above a street canyon in central London. The assumption required for the former storage determination is shown to be invalid. For approximately regular street canyons at least one other measurement is required. Continuous measurements at fewer locations are shown to be preferable to a spatially dense, switched profile, as temporal interpolation is ineffective. The majority of the spectral energy of the CO2 storage time series was found to be between 0.001 and 0.2 Hz (500 and 5 s respectively); however, sampling frequencies of 2 Hz and below still result in significantly lower CO2 storage values. An empirical method of correcting CO2 storage values from under-sampled time series is proposed. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81392
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography, King's College London, London, United Kingdom; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Bjorkegren A,B,, Grimmond C,et al. CO2 emission estimation in the urban environment: Measurement of the CO2 storage term[J]. Atmospheric Environment,2015-01-01,122