A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Emissions of atmospherically reactive gases nitrous acid and nitric oxide from Arctic permafrost peatlands (2022)

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

JYU-tekijät tai -toimittajat

Marushchak, Maija

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Bhattarai, Hem Raj; Marushchak, Maija E; Ronkainen, Jussi; Lamprecht, Richard E; Siljanen, Henri M P; Martikainen, Pertti J; Biasi, Christina; Maljanen, Marja

Lehti tai sarja: Environmental Research Letters

eISSN: 1748-9326

Julkaisuvuosi: 2022

Ilmestymispäivä: 11.02.2022

Volyymi: 17

Lehden numero: 2

Artikkelinumero: 024034

Kustantaja: IOP Publishing

Julkaisumaa: Britannia

Julkaisun kieli: englanti

DOI: https://doi.org/10.1088/1748-9326/ac4f8e

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/80405

Tiivistelmä

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.

YSO-asiasanat: maaperä; arktinen alue; ekosysteemit (ekologia); aineiden kierto; denitrifikaatio; nitrifikaatio; päästöt; typpioksidi; ilmakemia