DOI: 10.1016/j.atmosenv.2014.08.052
Scopus记录号: 2-s2.0-84907159158
论文题名: Spatial variability of carbon dioxide in the urban canopy layer and implications for flux measurements
作者: Crawford B ; , Christen A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98 起始页码: 308
结束页码: 322
语种: 英语
英文关键词: Carbon dioxide
; Eddy covariance
; Storage
; Urban canopy layer
Scopus关键词: Energy storage
; Eddy covariance
; Flux measurements
; Spatial variability
; Urban canopy layers
; Carbon dioxide
; carbon dioxide
; surface water
; air temperature
; canopy
; carbon dioxide
; data set
; eddy covariance
; mixing ratio
; neighborhood
; spatial distribution
; topography
; air pollutant
; air temperature
; Article
; atmosphere
; calculation
; Canada
; canopy
; circadian rhythm
; cold air
; environmental temperature
; neighborhood
; night
; photosynthesis
; residential area
; sweating
; topography
; urban area
; vegetation
; water availability
; British Columbia
; Canada
; Vancouver [British Columbia]
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: This contribution reports CO2 mixing ratios measured in the urban canopy layer (UCL) of a residential neighborhood in Vancouver, BC, Canada and discusses the relevance of UCL CO2 temporal and spatial variability to local-scale eddy covariance (EC) fluxes measured above the UCL. Measurements were conducted from a mobile vehicle-mounted platform over a continuous, 26-h period in the longterm turbulent flux source area of an urban EC tower. Daytime mixing ratios were highest along arterial roads and largely a function of proximity to vehicle traffic CO2 sources. At night, there was a distinct negative correlation between potential air temperature and CO2 mixing ratios. The spatial distribution of CO2 was controlled by topography and micro-scale advective processes (i.e. cold-air pooling). Mobile CO2 measurements were then used to calculate CO2 storage changes (FS) in the UCL volume and compared to single-layer FS estimates calculated from the EC system. In total, five variations of FS were calculated. On average, the choice of FS calculation method affected net measured hourly emissions (FC) by 5.2%. Analysis of FS using a four-year dataset measured at the EC tower show FS was 2.8% of hourly FC for this site on average. At this urban EC location, FS was relatively minor compared to FC and calculation of FS using a single-layer method was adequate, though FS still represents a potentially large uncertainty during individual hours. © 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80515
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography, University of British Columbia, 1984 West Mall, Vancouver, BC, Canada
Recommended Citation:
Crawford B,, Christen A. Spatial variability of carbon dioxide in the urban canopy layer and implications for flux measurements[J]. Atmospheric Environment,2014-01-01,98