Global agricultural N 2 O emission reduction strategies deliver climate benefits with minimal impact on stratospheric O 3 recovery

Weber, James and Keeble, James and Abraham, Nathan Luke and Beerling, David J. and Martin, Maria Val (2024) Global agricultural N 2 O emission reduction strategies deliver climate benefits with minimal impact on stratospheric O 3 recovery. npj Climate and Atmospheric Science, 7 (1): 121. ISSN 2397-3722

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Abstract

Agricultural nitrous oxide (N2O) emission reduction strategies are required given the potency of N2O as a greenhouse gas. However, the growing influence of N2O on stratospheric ozone (O3) with declining stratospheric chlorine means the wider atmospheric impact of N2O reductions requires investigation. We calculate a N2O emission reduction of 1.35 TgN2O yr-1 (~5% of 2020 emissions) using spatially separate deployment of nitrification inhibitors ($70–113 tCO2e−1) and crushed basalt (no-cost co-benefit) which also sequesters CO2. In Earth System model simulations for 2025–2075 under high (SSP3-7.0) and low (SSP1-2.6) surface warming scenarios, this N2O mitigation reduces NOx-driven O3 destruction, driving regional stratospheric O3 increases but with minimal impact on total O3 column recovery. By 2075, the radiative forcing of the combined N2O and CO2 reductions equates to a beneficial 9–11 ppm CO2 removal. Our results support targeted agricultural N2O emission reductions for helping nations reach net-zero without hindering O3 recovery.

Item Type:
Journal Article
Journal or Publication Title:
npj Climate and Atmospheric Science
ID Code:
221224
Deposited By:
Deposited On:
10 Jun 2024 10:00
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Jun 2024 00:37