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<p>Current climate prediction scenarios suggest dramatic changes of the different climatic parameters in the Polar Regions. In terms of soil aerobic/anaerobic conditions, the most important one is the mean annual precipitation that mostly determines the water saturation of soils and, therefore, methane (CH<sub>4</sub>) fluxes in cryogenic soils. Here, we determined the ambient rates of CH<sub>4</sub> emission/consumption by two types of cryogenic soils of the Fildes Peninsula (King George (Waterloo) Island, Southern Shetland Archipelago, Antarctica). In situ soil CH<sub>4</sub> concentrations measurements normalized by the atmospheric CH<sub>4</sub> concentration were mapped in the areas where systems of continuous meteorological monitoring were installed. The CH<sub>4</sub> fluxes measured using portable Cavity Ring-Down Spectrometer Picarro G4301 during austral summers of 2022-2023 showed systematically higher CH<sub>4</sub> uptake by non-waterlogged Cryosols compared to Arenosols. Antarctic soils demonstrated CH<sub>4</sub>-absorbing/emitting capacity throughout the season, which varied from − 215.0 to + 7.5&#xa0;µg CH<sub>4</sub> m<sup>−2</sup> h<sup>−1</sup>. The most pronounced soil methanotrophy was found in early January, while the highest CH<sub>4</sub> emission was registered in April. With a one month lag-phase, 0.8℃ in air temperature increase reduced the ability of soils to consume CH<sub>4</sub> by 1.5 times. The calculated Humidity Index showed that studied maritime Antarctic soils demonstrate a high potential to change from methanotrophy to methanogenesis if the precipitation increases in the future.</p>

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Maritime Cryogenic Antarctic Soils as a Non-obvious Methane Source

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • S. Yu. Evgrafova,
  • V. K. Kadutskiy,
  • B. I. Bakalenko,
  • A. G. Tikhonov,
  • A. V. Lupachev,
  • E. V. Abakumov,
  • B. R. Mavlyudov,
  • M. A. Korets,
  • I. V. Florinsky,
  • A. A. Timshin,
  • O. V. Masyagina

摘要

Current climate prediction scenarios suggest dramatic changes of the different climatic parameters in the Polar Regions. In terms of soil aerobic/anaerobic conditions, the most important one is the mean annual precipitation that mostly determines the water saturation of soils and, therefore, methane (CH4) fluxes in cryogenic soils. Here, we determined the ambient rates of CH4 emission/consumption by two types of cryogenic soils of the Fildes Peninsula (King George (Waterloo) Island, Southern Shetland Archipelago, Antarctica). In situ soil CH4 concentrations measurements normalized by the atmospheric CH4 concentration were mapped in the areas where systems of continuous meteorological monitoring were installed. The CH4 fluxes measured using portable Cavity Ring-Down Spectrometer Picarro G4301 during austral summers of 2022-2023 showed systematically higher CH4 uptake by non-waterlogged Cryosols compared to Arenosols. Antarctic soils demonstrated CH4-absorbing/emitting capacity throughout the season, which varied from − 215.0 to + 7.5 µg CH4 m−2 h−1. The most pronounced soil methanotrophy was found in early January, while the highest CH4 emission was registered in April. With a one month lag-phase, 0.8℃ in air temperature increase reduced the ability of soils to consume CH4 by 1.5 times. The calculated Humidity Index showed that studied maritime Antarctic soils demonstrate a high potential to change from methanotrophy to methanogenesis if the precipitation increases in the future.