[Quantitative estimation source of urban atmospheric CO2 by carbon isotope composition].
To effectively reduce urban carbon emissions and verify the effectiveness of currently project for urban carbon emission reduction, quantitative estimation sources of urban atmospheric CO2 correctly is necessary. Since little fractionation of carbon isotope exists in the transportation from pollution sources to the receptor, the carbon isotope composition can be used for source apportionment. In the present study, a method was established to quantitatively estimate the source of urban atmospheric CO2 by the carbon isotope composition. Both diurnal and height variations of concentrations of CO2 derived from biomass, vehicle exhaust and coal burning were further determined for atmospheric CO2 in Jiading district of Shanghai. Biomass-derived CO2 accounts for the largest portion of atmospheric CO2. The concentrations of CO2 derived from the coal burning are larger in the night-time (00:00, 04:00 and 20:00) than in the daytime (08:00, 12:00 and 16:00), and increase with the increase of height. Those derived from the vehicle exhaust decrease with the height increase. The diurnal and height variations of sources reflect the emission and transport characteristics of atmospheric CO2 in Jiading district of Shanghai.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. liuwei@sinap.ac.cn
Wei
W
Liu
Nan-Nan
NN
Wei
Guang-Hua
GH
Wang
Jian
J
Yao
You-Shi
YS
Zeng
Xue-Bo
XB
Fan
Yan-Hong
YH
Geng
Yan
Y
Li
D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D002247:Carbon Isotopes / Q000032:analysis*; D002681:China; D002947:Cities; D003031:Coal / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D001335:Vehicle Emissions / Q000032:analysis*
D000393:Air Pollutants; D002247:Carbon Isotopes; D003031:Coal; D001335:Vehicle Emissions; D002245:Carbon Dioxide