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Fossil-Fuel-Derived CO2 Contribution to the Urban Atmosphere in Guangzhou, South China, Estimated by 14CO2 Observation, 2010–2011

Published online by Cambridge University Press:  09 February 2016

P Ding
Affiliation:
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
C D Shen*
Affiliation:
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
W X Yi
Affiliation:
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
N Wang
Affiliation:
Department of Earth Science, University of Hong Kong, Hong Kong, China
X F Ding
Affiliation:
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
D P Fu
Affiliation:
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
K X Liu
Affiliation:
State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
*
3Corresponding author. Email: cdshen@gig.ac.cn.

Abstract

From October 2010 to November 2011, the urban atmospheric CO2 concentration in Guangzhou ranged from 550 to 460 ppm, with mean monthly concentration fluctuating between 530 and 470 ppm. A lower concentration was observed in summer and autumn, while a higher concentration occurred in spring and winter. The urban atmospheric CO2 δ13C value varied between −9.00 and −13.10%, with mean monthly value fluctuating between −9.60 and −11.80%. There was no significant relationship between the CO2 concentration and δ13C value, reflecting the influence from the fossil-fuel-derived CO2 on the urban atmospheric CO2. The urban atmospheric CO2 Δ14C value fluctuated dramatically from 29.1 ± 2.5% to −85.2 ± 3. 1%, with a mean annual value of −16.4 ± 3.0%. A similar seasonal variation of Δ14C value with the concentrations was observed: the higher Δ14C values mainly appeared in summer and autumn (July to September), with a mean value of about −5.2 ± 2.9%, while lower Δ14C values occurred in spring and winter (December to April), about −27.1 ± 3.2% average. Based on the atmospheric Δ14C values, the calculated fossil-fuel-derived CO2 concentrations range between 1 and 58 ppm, with the mean annual concentration around 24 ppm. Similarly, a lower fossil-fuel-derived CO2 concentration appeared in summer and autumn (July to September) with a mean value of ∼17 ppm, while the higher fossil-fuel-derived CO2 concentration occurred in spring and winter (December to April) with an average value of ∼29 ppm. A comparison of the CO2 concentrations before and after the Guangzhou Asian Games (in November 2010) and the Spring Festival of 2011 confirmed that human activities can greatly decrease the fossil-fuel-derived CO2 emissions to the urban atmosphere in Guangzhou.

Type
Articles
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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