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Unveiling the impact of soil methane sink on atmospheric methane concentrations in 2020
Global Change Biology ( IF 10.8 ) Pub Date : 2024-06-26 , DOI: 10.1111/gcb.17381
Xiaoqi Zhou 1 , Wensheng Xiao 1 , Li Cheng 1 , Simeon J Smaill 2 , Shushi Peng 3
Affiliation  

In 2020, anthropogenic methane (CH4) emissions decreased due to COVID‐19 containment policies, but there was a substantial increase in the concentration of atmospheric CH4. Previous research suggested that this abnormal increase was linked to higher wetland CH4 emissions and a decrease in the atmospheric CH4 sink. However, the impact of changes in the soil CH4 sink remained unknown. To address this, we utilized a process‐based model to quantify alterations in the soil CH4 sink of terrestrial ecosystems between 2019 and 2020. By implementing the model with various datasets, we consistently observed an increase in the global soil CH4 sink, reaching up to 0.35 ± 0.06 Tg in 2020 compared to 2019. This increase was primarily attributed to warmer soil temperatures in northern high latitudes. Our results emphasize the importance of considering the CH4 sink in terrestrial ecosystems, as neglecting this component can lead to an underestimation of both emission increases and reductions in atmospheric CH4 sink capacity. Furthermore, these findings highlight the potential role of increased soil warmth in terrestrial ecosystems in slowing the growth of CH4 concentrations in the atmosphere.

中文翻译:


揭示2020年土壤甲烷汇对大气甲烷浓度的影响



2020 年,人为甲烷(CH 4 )由于 COVID-19 遏制政策,排放量有所减少,但大气中 CH 浓度大幅增加4 。先前的研究表明,这种异常增加与湿地 CH 较高有关4排放和大气中 CH 的减少4下沉。然而,土壤CH变化的影响4水槽仍然未知。为了解决这个问题,我们利用基于过程的模型来量化土壤 CH 的变化4 2019 年至 2020 年间陆地生态系统的汇。通过使用各种数据集实施该模型,我们持续观察到全球土壤 CH 的增加4与 2019 年相比,到 2020 年将达到 0.35 ± 0.06 Tg。这种增加主要归因于北部高纬度地区土壤温度升高。我们的结果强调了考虑 CH 的重要性4陆地生态系统中的汇,因为忽略这一组成部分可能导致低估大气中 CH 的排放增加和减少4水槽容量。此外,这些发现强调了陆地生态系统中土壤温度升高在减缓 CH 生长方面的潜在作用。 4大气中的浓度。
更新日期:2024-06-26
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