期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 127, 期 12, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JD036504
关键词
isotopic compositions; CO2 emissions; fossil fuel combustion; source attribution; verification
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA23010302, XDB40000000]
- National Natural Science Foundation of China [41730108, 42173082]
- Natural Science Basic Research Program of Shaanxi Province [2019JCW-20, 2021JQ-319]
This study estimates the source contributions of CO2 emissions in Chinese megacities by conducting regular observations of atmospheric CO2 mixing ratio and carbon isotope compositions in Xi'an and Beijing during winter. The results show that fossil-fuel sources, particularly coal combustion in Xi'an and natural-gas combustion in Beijing, account for the majority of CO2 emissions in both cities.
Identifying the sources of atmospheric Carbon dioxide (CO2) is an important prerequisite for developing effective mitigation strategies. Here we conducted regular observations of the atmospheric CO2 mixing ratio and its carbon isotope compositions (i.e., Delta C-14 and delta C-13) in Xi'an and Beijing during winter, to estimate source contributions of CO2 emissions in Chinese megacities. The results showed that CO2 emissions in both Xi'an and Beijing originated mainly from fossil-fuel sources, which contributed 65 +/- 3% and 82 +/- 2% of the total CO2 enhancement, respectively, during the sampling period; the results also revealed a substantial biogenic CO2 contribution during winter. We further separated the fossil-fuel sources into contributions from coal, oil and natural gas combustions. We found that coal combustion was the dominant anthropogenic source in Xi'an, accounting for 54 +/- 4% of the total fossil-fuel emissions, and oil and natural gas contribute almost equally to the emissions. In contrast, emission from natural-gas combustion was the main fossil-fuel source in Beijing, accounting for more than half of the total fossil-fuel emissions, whereas, coal combustion contributed only 17 +/- 10%. These top-down results are generally consistent with emission inventory when seasonal variations of emissions are considered; some differences between the two methods indicated that the inventory for Xi'an might be underestimating the emissions from oil consumption. This pilot study confirms the potential of direct verification between top-down and bottom-up methods from the perspective of source attribution.
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