The large amount of fossil CO2 emitted by human activities is the main reason for the increase of atmospheric CO2 concentration. About 70% of the CO2 emissions from fossil sources occur in cities. Therefore, the CO2 emission characteristics of urban fossil sources can be recognized for carbon emission reduction policies. Evaluate the effectiveness of emission reduction and provide a key scientific basis for serving the development of a low-carbon economy.
Academician of the Chinese Academy of Sciences and researcher Zhou Weijian and his team at the Institute of Earth Environment of the Chinese Academy of Sciences have earlier conducted research on the use of 14C to monitor CO2 in urban atmospheric fossil sources. Recently, Zhou Weijian's team has carried out long-term continuous atmospheric CO2 observations in different regions of Xi’an City on the basis of its previous work, and for the first time combined the two carbon isotope tracer methods △14C and δ13C to reveal the changes in the source and sink of CO2 regions and seasons in urban fossil sources. Features and laws. The study found that the average contribution of CO2 emissions from fossil sources in winter to newly added atmospheric CO2 (total concentration minus background concentration) was 61.8 ± 10.6% and 57.4 ± 9.7% respectively in urban and suburban areas, of which coal was the main source of emissions. In summer, due to the influence of source and sink factors such as soil respiration and plant photosynthesis, the average contribution of fossil CO2 is higher than that of winter, and it shows a regional change rule contrary to winter, that is, suburbs (90.0±24.8%) are greater than urban areas. (82.5±23.8%). This result shows that reducing coal consumption is still an important way to reduce carbon emissions in cities. At the same time, biological emissions cannot be neglected because the process of biomass combustion and organic matter decomposition make its contribution to atmospheric CO2 up to 40% in winter. In summer, due to the increased photosynthesis intensity of plants, biological activity can play a carbon sink role in the urban carbon cycle. Based on this, the study believes that the formulation of carbon emission reduction policies in the future should fully consider the contribution of biological emissions to urban atmospheric CO2.
The related research results were published in the Science of the Total Environment based on the measurements of carbon dioxide concentration, △14C and δ13C. The study was funded by the National Natural Science Foundation of China, the Chinese Academy of Sciences and the Ministry of Environmental Protection.
The proportion of CO2ff in the newly added atmospheric CO2 in winter and summer (left) and Miller-Tans regression analysis results, the slope indicates the δ13C isotopic characteristics of atmospheric CO2 emission source (right)
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