Increased nitrous oxide emissions from global lakes and reservoirs since the pre-industrial era

Ya Li, Hanqin Tian (), Yuanzhi Yao, Hao Shi, Zihao Bian, Yu Shi, Siyuan Wang, Taylor Maavara, Ronny Lauerwald and Shufen Pan
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Ya Li: Chinese Academy of Sciences
Hanqin Tian: Center for Earth System Science and Global Sustainability, Schiller Institute for Integrated Science and Society, Department of Earth and Environmental Sciences, Boston College
Yuanzhi Yao: East China Normal University
Hao Shi: Chinese Academy of Sciences
Zihao Bian: Auburn University
Yu Shi: Auburn University
Siyuan Wang: Chinese Academy of Sciences
Taylor Maavara: School of Geography, University of Leeds
Ronny Lauerwald: Université Paris-Saclay, INRAE, AgroParisTech, UMR ECOSYS
Shufen Pan: Auburn University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Lentic systems (lakes and reservoirs) are emission hotpots of nitrous oxide (N2O), a potent greenhouse gas; however, this has not been well quantified yet. Here we examine how multiple environmental forcings have affected N2O emissions from global lentic systems since the pre-industrial period. Our results show that global lentic systems emitted 64.6 ± 12.1 Gg N2O-N yr−1 in the 2010s, increased by 126% since the 1850s. The significance of small lentic systems on mitigating N2O emissions is highlighted due to their substantial emission rates and response to terrestrial environmental changes. Incorporated with riverine emissions, this study indicates that N2O emissions from global inland waters in the 2010s was 319.6 ± 58.2 Gg N yr−1. This suggests a global emission factor of 0.051% for inland water N2O emissions relative to agricultural nitrogen applications and provides the country-level emission factors (ranging from 0 to 0.341%) for improving the methodology for national greenhouse gas emission inventories.

Date: 2024
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DOI: 10.1038/s41467-024-45061-0

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