Nitrous oxide dynamics in the Arctic Siberian shelves of the North Kara Sea 
during summer 2021

Muller, Sofia; Fripiat, François; Martinez-Garcia, Alfredo; Jaccard, Samuel L.; Hölemann, Jens A.; Delille, Bruno

doi:10.5194/egusphere-egu24-13280

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Nitrous oxide dynamics in the Arctic Siberian shelves of the North Kara Sea during summer 2021

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Martinez-Garcia, Alfredo
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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https://meetingorganizer.copernicus.org/EGU24/EGU24-13280.html
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Citation

Muller, S., Fripiat, F., Martinez-Garcia, A., Jaccard, S. L., Hölemann, J. A., & Delille, B. (2024). Nitrous oxide dynamics in the Arctic Siberian shelves of the North Kara Sea during summer 2021. In EGU General Assembly 2024, Vienna, Austria & Online. doi:10.5194/egusphere-egu24-13280.

Cite as: https://hdl.handle.net/21.11116/0000-000F-D155-5

Abstract

In EGU General Assembly 2024, Vienna, Austria & Online

Nitrous oxide (N2O) distribution in the North Kara Sea during summer 2021 shows elevated N2O concentrations in shelf water masses, highlighting the significance of coupled benthic-pelagic and nitrification-denitrification processes. In surface waters, temperature emerges as the primary driver of N2O concentrations, with a clear negative correlation between both parameters. Most surface waters are near saturation for N2O, and the saturation deficit exhibits an inverse relationship with temperature. Under-ice water influx originating from the open ocean exhibits strong under-saturation (80%), attributed to the limited air-sea exchange in sea ice covered waters. Contrary to expectations, river supply does not exert a discernable influence on N2O concentrations in the studied area. This study reveals the potential of the Arctic Siberian shelves for the uptake of atmospheric N2O during summer.