Atmospheric Oxygen (O₂) is one of the dominating features that allow the earth to be a habitable planet with advanced civilization and diverse biology. However, since the late 1980s, observational data have indicated a steady decline in O₂ content on the scale of parts-per-million level. The current scientific consensus is that the decline is caused by the fossil-fuel combustion; however, few works have been done to quantitatively evaluate the response of O₂ cycle under the anthropogenic impact, at both the global and regional scales. This paper manages to quantify the land O₂ flux and makes the initial step to quantificationally describe the anthropogenic impacts on the global O₂ budget. Our estimation reveals that the global O₂ consumption has experienced an increase from 33.69 ± 1.11 to 47.63 ± 0.80 Gt (gigaton, 10⁹ t) O₂ yr⁻¹ between 2000 and 2018, while the land production of O₂ (totaling 11.34 ± 13.48 Gt O₂ yr⁻¹ averaged over the same period) increased only slightly. In 2018, the combustion of fossil-fuel and industrial activities (38.45 ± 0.61 Gt O₂ yr⁻¹) contributed the most to consumption, followed by wildfires (4.97 ± 0.48 Gt O₂ yr⁻¹) as well as livestock and human respiration processes (2.48 ± 0.16 and 1.73 ± 0.13 Gt O₂ yr⁻¹, respectively). Burning of fossil-fuel that causes large O₂ fluxes occurs in East Asia, India, North America, and Europe, while wildfires that cause large fluxes in comparable magnitude are mainly distributed in central Africa.

中文翻译：

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1975年至2018年大气网格耗氧量的估算

大气氧气（O ₂）是主要特征之一，使地球成为具有先进文明和多样化生物的宜居星球。然而，自1980年代后期以来，观测数据表明O ₂含量以百万分之几的水平呈稳定下降趋势。当前的科学共识是下降是由化石燃料燃烧引起的。然而，在全球和区域范围内，几乎没有人为量化评估人为影响下O ₂循环的响应。本文设法量化土地O _2的通量，并采取第一步定量地描述人为对全球O _2的影响。预算。我们的估计显示，2000年至2018年之间，全球O ₂消耗量从33.69±1.11增加到47.63±0.80 Gt（千兆吨，10 ⁹ t）O ₂ yr ^-1，而O ₂的土地生产（总计11.34±同期平均为13.48 Gt O ₂ yr ^-1）仅略有增加。2018年，化石燃料和工业活动的燃烧（38.45±0.61 Gt O ₂ yr ^-1）贡献最大，其次是野火（4.97±0.48 Gt O ₂ yr ^-1）以及牲畜和人类呼吸过程（2.48±0.16和1.73±0.13 Gt O分别为₂ yr ^-1）。在东亚，印度，北美和欧洲，燃烧引起大O ₂通量的化石燃料燃烧，而引起大通量的野火主要分布在非洲中部。