4.7 Article

Emissions of atmospherically reactive gases nitrous acid and nitric oxide from Arctic permafrost peatlands

期刊

ENVIRONMENTAL RESEARCH LETTERS
卷 17, 期 2, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1748-9326/ac4f8e

关键词

Arctic ecosystem; soil nitrogen cycle; HONO and NO; nitrification; denitrification; atmospheric chemistry

资金

  1. Academy of Finland [297735]
  2. University of Eastern Finland
  3. Academy of Finland Center of Excellence program [307331]
  4. ENSINK project [334422]
  5. NOCA project [314630]
  6. Academy of Finland.
  7. PANDA project - Academy of Finland [317054]
  8. Academy of Finland (AKA) [297735, 317054, 297735, 317054] Funding Source: Academy of Finland (AKA)

向作者/读者索取更多资源

Soils are important sources of nitric oxide (NO) and nitrous acid (HONO) in the atmosphere. This study reports the first measurements of HONO and NO emissions from high-latitude soils, specifically permafrost-affected subarctic peatlands. The results show significant emissions of HONO and NO from unvegetated peat surfaces, indicating the need for further examination of HONO and NO emissions in Arctic landscapes.
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 mu g N m(-2)h(-1)) and NO (0.4-59.3 mu g N m(-2)h(-1)) emissions from unvegetated peat surfaces, rich with mineral N, compared to low emissions (<= 0.2 mu g N m(-2)h(-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.

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