Characterizing Dissolved Organic Matter and Other Water-Soluble Compounds in Ground Ice of the Russian Arctic: A Focus on Ground Ice Classification within the Carbon Cycle Context

Semenov, P.; Pismeniuk, A.; Kil, A.; Shatrova, E.; Belova, N.; Gromov, P.; Malyshev, S.; He, W.; Lodochnikova, A.; Tarasevich, I.; Streletskaya, I.; Leibman, M.

Авторы: Semenov Petr, Pismeniuk Anfisa, Kil Anna, Shatrova Elizaveta, Belova Natalia, Gromov Petr, Malyshev Sergei, He Wei, Lodochnikova Anastasiia, Tarasevich Ilya, Streletskaya Irina, Leibman Marina
Журнал: Applied Sciences
Том: 14
Номер: 77
Год издания: 2024
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 1
Последняя страница: 23
DOI: 10.3390/geosciences14030077
Аннотация: Climate-induced changes contribute to the thawing of ice-rich permafrost in the Arctic,which leads to the release of large amounts of organic carbon into the atmosphere in the formof greenhouse gases, mainly carbon dioxide and methane. Ground ice constitutes a considerablevolume of the cryogenically sequestered labile dissolved organic carbon (DOC) subjected to fastmineralization upon thawing. In this work, we collected a unique geochemical database of theground and glacier ice comprising the samples from various geographic locations in the RussianArctic characterized by a variety of key parameters, including ion composition, carbon-bearing gases(methane and carbon dioxide), bulk biogeochemical indicators, and fluorescent dissolved organicmatter (DOM) fractions. Our results show that interaction with solid material—such as sediments,detritus, and vegetation—is likely the overriding process in enrichment of the ground ice in all thedissolved compounds. Terrigenous humic-like dissolved organic matter was predominant in all theanalyzed ice samples except for glacier ice from Bolshevik Island (the Severnaya Zemlya archipelago)and pure (with low sediment content) tabular ground ice from western Yamal. The labile protein-likeDOM showed no correlation to humic components and was probably linked to microbial abundancein the ground ice. The sum of the fluorophores deconvoluted by PARAFAC strongly correlates toDOC, which proves the potential of using this approach for differentiation of bulk DOC into fractionswith various origins and biogeochemical behaviors. The pure tabular ground ice samples exhibitthe highest rate of fresh easily degradable DOM in the bulk DOC, which may be responsible for theamplification of permafrost organic matter decomposition upon thawing.
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Characterizing Dissolved Organic Matter and Other Water-Soluble Compounds in Ground Ice of the Russian Arctic: A Focus on Ground Ice Classification within the Carbon Cycle Contextстатья Исследовательская статья

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