A105-09
The impact of human and livestock respiration on urban CO2 budget

Thursday, 10 December 2020: 17:54
Virtual
Qixiang Cai, Insititute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China, Ning Zeng, University of Maryland, Department of Atmospheric and Oceanic Science, College Park, United States, Pengfei Han, Corresponding Author, Beijing, China; Institute of Atmospheric Physics, Chinese Academy of Sciences, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Beijing, China, Di Liu, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China, Xiaohui Lin, Institute of Atmospheric Physics, Chinese Academy of Sciences, State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Beijing, China, Jingwen Chen, Hohai University, Nanjing, China and Fang Zhao, University of Maryland, College Park, MD, United States
Abstract:
Excepted of carbon emissions from fossil fuel within a city, the carbon released from human and livestock through digestion and decomposition is also a part of the carbon cycle of urban system, which was often neglected due to its small magnitude compared with fossil fuel. At present, the human and livestock respiration is mostly included in some analysis of local urban system, and considered to be necessary for CO2 monitoring and CO2 flux inversion in areas with high population density. However, high-resolution datasets of carbon release from human and livestock respiration was rarely been seen in a global scale or even in global cities. This study estimated the carbon released from human and livestock respiration in global and within large cities, and then, we compare it with carbon emissions from fossil fuel within 14 reported world cities. The results showed that, the carbon from human and livestock respiration increased from 1990-2014 mainly dominated by population growth. Almost 90% of the respiratory carbon comes from urban area in most of the cities, while up to one thirds of them comes from suburban area in Beijing. In addition, the total ratio of human and livestock respiration leads to up to 40% of fossil fuel within all the studied cities. The results suggested that, considering the food and feedstuff demands in some regions, the heterotrophic respiration have huge impacts on the carbon cycle in city areas.
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