Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 17
Articles | Volume 22, issue 17
https://doi.org/10.5194/bg-22-4387-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-4387-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 17
Research article
 | 
04 Sep 2025
Research article |  | 04 Sep 2025

A national-scale redox clustering for quantifying CO2 emissions from groundwater denitrification

Hyojin Kim, Julian Koch, Birgitte Hansen, and Rasmus Jakobsen

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Latest update: 03 Oct 2026
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Short summary

Nitrate pollution from farming is a global problem. A natural process called denitrification helps remove nitrate but also releases CO2, which contributes to climate change. Our study shows that CO2 from this process in Danish groundwater may be a major overlooked source – similar to other known agricultural CO2 emissions. This highlights the need to update greenhouse gas reporting to better reflect farming’s full climate impact.

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