2"岛,城市化水平,土地利用类型,移动监测,上海市," /> 2"岛,城市化水平,土地利用类型,移动监测,上海市,"/> Spatial characteristics of near surface CO<sub>2</sub> concentration and analysis on its influencing factors in spring in shanghai city

RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (09): 1443-1450.doi: 10.11870/cjlyzyyhj201509001

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Spatial characteristics of near surface CO2 concentration and analysis on its influencing factors in spring in shanghai city

ZHU Xi-yang1,3, PAN Chen2,3, LIU Min1,3, YANG Fang1,3, JIA Wen-xiao1,3, XIANG Wei-ning1,3   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
    2. School of Geographic Sciences, East China Normal University, Shanghai 200241, China;
    3. Shanghai Key Lab for Urban Ecological Processes and Eco-restoration, East China Normal University, Shanghai 200241, China
  • Received:2014-11-26 Revised:2015-01-30 Online:2015-09-20
  • Contact: 刘敏,E-mail:mliu@re.ecnu.edu.cn E-mail:mliu@re.ecnu.edu.cn

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Abstract: The rapid process of urbanization worldwide has a profound effect on global carbon cycle. It's important to have an explicit understanding of the spatial distribution of CO2 to recognize and control Green-house gases (GHGs) emission, which is helpful to reduce human-induced contribution to global climate change. The study area of this project is set in the metropolitan city of Shanghai with the background of high-intensity of human activities and rapid urbanization. Mobile measuring methodology was used to determine near surface CO2 concentration along typical transects in spring, 2014 by means of near infrared gas analyzer LI-840A, combined with classification of urbanization levels and types of land use information derived from remote sensing data. Qualitative and quantitative analysis of CO2 concentration's response mechanisms to urbanization levels and types of land use are represented in this paper. Data suggested a well-shaped carbon dioxide dome with mean concentration of 445.8±40.5 μmol/mol in the city center, 55.1 μmol/mol (13.3%) higher than that in suburban areas. CO2 concentration exhibited a significant spatial heterogeneity and descended in a sequence with three directions which were northwest, southwest and southeast, respectively. Near surface CO2 has a negative relationship with distance to the city center with a decline of 1.56 μmol/mol per kilometer. In general, Near surface CO2 concentrations dropped rapidly within the range of 20 km from the urban core (DUC) while rather slowly out of the same range(approximately 0.7 μmol/mol/km). Urbanization levels within the territory of Shanghai City have significant impacts on concentrations of near surface CO2. According to the classification of urbanization levels, concentrations with high, middle, low urbanization level and suburban areas are 467.6±44.7, 451.7±41.1, 452.7±34.9 and 426.0±24.8 μmol/mol, respectively. Coverage rate of forested land has the highest correlation with near surface CO2 concentration following by the construction areas, farmland and grassland with the correlation coefficient of -0.64, 0.63, -0.55 and -0.52(P<0.01), respectively. Correlation coefficients between near surface CO2 concentrations and types of land use score higher values in high urbanization and suburban areas than in middle and low urbanization areas.

Key words: near surface CO2 concentration, carbon dioxide dome, urbanization level, types of land use, mobile measuring methodology, Shanghai city

CLC Number: 

  • X831
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