Emissions of atmospherically reactive gases nitrous acid and nitric oxide from Arctic permafrost peatlands
Bhattarai, H. R., Marushchak, M. E., Ronkainen, J., Lamprecht, R. E., Siljanen, H. M. P., Martikainen, P. J., Biasi, C., & Maljanen, M. (2022). Emissions of atmospherically reactive gases nitrous acid and nitric oxide from Arctic permafrost peatlands. Environmental Research Letters, 17(2), Article 024034. https://doi.org/10.1088/1748-9326/ac4f8e
Published inEnvironmental Research Letters
© 2022 The Author(s). Published by IOP Publishing Ltd.
Soils are important sources of nitric oxide (NO) and nitrous acid (HONO) in the atmosphere. These nitrogen (N)-containing gases play a crucial role in atmospheric chemistry and climate at different scales because of reactions modulated by NO and hydroxyl radicals (OH), which are formed via HONO photolysis. Northern permafrost soils have so far remained unexplored for HONO and NO emissions despite their high N stocks, capacity to emit nitrous oxide (N2O), and enhancing mineral N turnover due to warming and permafrost thawing. Here, we report the first HONO and NO emissions from high-latitude soils based on measurements of permafrost-affected subarctic peatlands. We show large HONO (0.1–2.4 µg N m−2h−1) and NO (0.4–59.3 µg N m−2h−1) emissions from unvegetated peat surfaces, rich with mineral N, compared to low emissions (⩽0.2 µg N m−2h−1 for both gases) from adjacent vegetated surfaces (experiments with intact peat cores). We observed HONO production under highly variable soil moisture conditions from dry to wet. However, based on complementary slurry experiments, HONO production was strongly favored by high soil moisture and anoxic conditions. We suggest urgent examination of other Arctic landscapes for HONO and NO emissions to better constrain the role of these reactive N gases in Arctic atmospheric chemistry. ...
ISSN Search the Publication Forum1748-9326
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Related funder(s)Academy of Finland
Funding program(s)Postdoctoral Researcher, AoF
Additional information about fundingThe Academy of Finland funded this study under the project ‘The origin of nitrous acid (HONO) emissions from northern soils and linkages to nitrogen cycle processes’ (Grant No. 297735) and the doctoral program of the University of Eastern Finland (Grant to H R Bhattarai). We also thank the Academy of Finland Center of Excellence program (Project No. 307331) for supporting this study, as well as the ENSINK project (Decision No. 334422) and the NOCA project (Decision No. 314630), also funded by the Academy of Finland. The work of M E M was further supported by the PANDA project funded by the Academy of Finland (Decision No. 317054). ...
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