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《科学通报(英文版)》 2018-18
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The global oxygen budget and its future projection

Jianping Huang;Jiping Huang;Xiaoyue Liu;Changyu Li;Lei Ding;Haipeng Yu;Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, Lanzhou University;Enlightening Bioscience Research Center;  
Atmospheric oxygen (O_2 ) is the most crucial element on earth for the aerobic organisms that depend on it to release energy from carbon-based macromolecules. This is the first study to systematically analyze the global O_2 budget and its changes over the past 100 years. It is found that anthropogenic fossil fuel combustion is the largest contributor to the current O_2 deficit, which consumed 2.0 Gt/a in 1900 and has increased to 38.2 Gt/a by 2015. Under the Representative Concentration Pathways (RCPs) RCP8.5 scenario, approximately 100Gt (gigatonnes) of O_2 would be removed from the atmosphere per year until 2100,and the O_2 concentration will decrease from its current level of 20.946%to 20.825%. Human activities have caused irreversible decline of atmospheric O_2 . It is time to take actions to promote O_2 production and reduce O_2 consumption.
【Fund】: supported by the National Natural Science Foundation of China (41521004);; the China University Research Talents Recruitment Program (111 project B13045)
【CateGory Index】: P467
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