the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Impact of anthropogenic activities on global land oxygen flux
Abstract. Atmospheric oxygen (O2) is one of the predominant features that enable Earth as a habitable planet for active and diverse biology. However, observations since the late 1980s indicate that O2 content in the atmosphere is falling steadily at part-per-million level. Although a scientific consensus has emerged that the current decline is generally attributed to the combustion of fossil fuel, a quantitative assessment of the anthropogenic impact on the O2 cycle on both global and regional scale is currently lacking. This paper quantifies the anthropogenic and biological O2 flux over land and provides a quantitative and dynamic description of land O2 budget under impacts of human activities on grid scale. It is found that total anthropogenic O2 flux over land has risen from 35.6 Gt/yr in 2000 to 46.0 Gt/yr in 2013, while the compensation from land (11.5 Gt/yr averaged from 2000 to 2013) displays a faint increase during the same period. High anthropogenic fluxes mainly occur in Eastern Asia, India, North America and Europe caused by fossil fuel combustion and in Central Africa caused by wildfire. Due to strong heterotrophic soil respiration under higher temperature conditions, the positive O2 flux in the tropics is not significant. Instead, boreal forest and Tibetan plateau become the most important sources of atmospheric O2 in the Anthropocene. The anthropogenic oxygen consumption data are publicly available online at https://doi.org/10.1594/PANGAEA.899167.
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- RC1: 'Review ESSD-2019-36', Anonymous Referee #1, 03 Jun 2019
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RC2: 'subject', Anonymous Referee #2, 06 Jun 2019
- AC1: 'Response to anonymous referee #2', Jianping Huang, 12 Jun 2019
- AC2: 'Response to anonymous referee #2 - corrected version', Jianping Huang, 12 Jun 2019
- EC1: 'Probably not suitable for ESSD', David Carlson, 18 Jun 2019
- RC1: 'Review ESSD-2019-36', Anonymous Referee #1, 03 Jun 2019
-
RC2: 'subject', Anonymous Referee #2, 06 Jun 2019
- AC1: 'Response to anonymous referee #2', Jianping Huang, 12 Jun 2019
- AC2: 'Response to anonymous referee #2 - corrected version', Jianping Huang, 12 Jun 2019
- EC1: 'Probably not suitable for ESSD', David Carlson, 18 Jun 2019
Data sets
Anthropogenic oxygen flux from 1975 to 2013 X. Liu, J. Huang, J. Huang, C. Li, and L. Ding https://doi.org/10.1594/PANGAEA.899167
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Cited
2 citations as recorded by crossref.
- Identifying the spatiotemporal changes of annual harvesting areas for three staple crops in China by integrating multi-data sources Y. Luo et al. 10.1088/1748-9326/ab80f0
- Factors contributing to spatial–temporal variations of observed oxygen concentration over the Qinghai-Tibetan Plateau P. Shi et al. 10.1038/s41598-021-96741-6