Articles | Volume 21, issue 24
https://doi.org/10.5194/bg-21-5725-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-5725-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Dec 2024
Research article |
| 20 Dec 2024
| 20 Dec 2024
Seasonal and spatial pattern of dissolved organic matter biodegradation and photodegradation in boreal humic waters
Artem V. Chupakov
Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
Natalia V. Neverova
Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
Anna A. Chupakova
Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
Svetlana A. Zabelina
Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
Liudmila S. Shirokova
Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
Geoscience and Environment Toulouse, UMR 5563 CNRS, University of Toulouse, 14 Avenue Edouard Belin, Toulouse 31400, France
Taissia Ya. Vorobyeva
Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab Severnoi Dviny 23, Arkhangelsk 163000, Russia
Oleg S. Pokrovsky
CORRESPONDING AUTHOR
Geoscience and Environment Toulouse, UMR 5563 CNRS, University of Toulouse, 14 Avenue Edouard Belin, Toulouse 31400, France
BIO-GEO-CLIM Laboratory, Tomsk State University, 35 Lenina Pr., Tomsk 634050, Russia
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Biogeosciences, 23, 6613–6637, https://doi.org/10.5194/bg-23-6613-2026, https://doi.org/10.5194/bg-23-6613-2026, 2026
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We studied 800 kilometers of the lower Lena River in Siberia to understand how this large Arctic river releases climate-warming gases and carries natural elements from frozen landscapes to the ocean. Using boat-based measurements and water samples, we found that CO2 release changes strongly over short distances, while CH4 variations are very small. Most dissolved carbon stayed stable, and many metals were carried by tiny natural particles. Warming and thawing ground may shift these balances.
Christine L. Olson, Kevin Schaefer, Alyssa Azaroff, Hélène Angot, Sasiri Bandara, Thomas A. Douglas, Bo Elberling, Maria Florencia Fahnestock, Xinbin Feng, Charlotte Haugk, Gustaf Hugelius, Erfan Jahangir, Sofi Jonsson, Shichang Kang, Adam Kirkwood, Jennifer Korosi, Igor Lehnherr, Artem Lim, Rinat Manasypov, Dmitriy Moskovchenko, Mina Nasr, Daniel Obrist, David Olefeldt, Connor Olson, Oleg Pokrovsky, Laura Sereni, Sarah Shakil, M. Isabel Smith, Jens Søndergaard, Jeroen Sonke, Kasia Staniszewska, Jens Strauss, Kyra St. Pierre, Lauren Thompson, Andrey Yurtaev, Yanxu Zhang, and Scott Zolkos
Earth Syst. Sci. Data, 18, 4509–4522, https://doi.org/10.5194/essd-18-4509-2026, https://doi.org/10.5194/essd-18-4509-2026, 2026
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Permafrost regions store large amounts of mercury, a toxic pollutant that can be released as the ground warms. We combined thousands of measurements from soils, plants, water, and lake sediments into one open database to better understand where mercury is stored and how it moves. The results show clear differences among environments and reveal major data gaps, helping improve future research, monitoring, and decision-making.
Lucia Pérez-Serrano, Sergey V. Loiko, Artem Lim, Laure Gandois, Christine Hatté, Jean-Luc Rols, and Oleg S. Pokrovsky
EGUsphere, https://doi.org/10.5194/egusphere-2026-3058, https://doi.org/10.5194/egusphere-2026-3058, 2026
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Permafrost peatlands under climate change are likely to release elements trapped in frozen layers. We sampled a highly ice-enriched thaw gradient in the arctic tundra. Frozen layers are characterized by a labile, microbial signature opposed to active layer porewaters homogenized through the freeze-thaw seasonal cycles. Permafrost degradation may result into the mobilization of carbon and nutrients through phosphorous consumption before hydrological export.
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The Cryosphere, 18, 5865–5885, https://doi.org/10.5194/tc-18-5865-2024, https://doi.org/10.5194/tc-18-5865-2024, 2024
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Permafrost (permanently frozen soil at depth) is thawing as a result of climate change. However, estimating its future degradation is particularly challenging due to the complex multi-physical processes involved. In this work, we designed and ran numerical simulations for months on a supercomputer to quantify the impact of climate change in a forested valley of central Siberia. There, climate change could increase the thickness of the seasonally thawed soil layer in summer by up to 65 % by 2100.
Simon Cazaurang, Manuel Marcoux, Oleg S. Pokrovsky, Sergey V. Loiko, Artem G. Lim, Stéphane Audry, Liudmila S. Shirokova, and Laurent Orgogozo
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Moss, lichen and peat samples are reconstructed using X-ray tomography. Most samples can be cut down to a representative volume based on porosity. However, only homogeneous samples could be reduced to a representative volume based on hydraulic conductivity. For heterogeneous samples, a devoted pore network model is computed. The studied samples are mostly highly porous and water-conductive. These results must be put into perspective with compressibility phenomena occurring in field tests.
Artem G. Lim, Ivan V. Krickov, Sergey N. Vorobyev, Mikhail A. Korets, Sergey Kopysov, Liudmila S. Shirokova, Jan Karlsson, and Oleg S. Pokrovsky
Biogeosciences, 19, 5859–5877, https://doi.org/10.5194/bg-19-5859-2022, https://doi.org/10.5194/bg-19-5859-2022, 2022
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In order to quantify C transport and emission and main environmental factors controlling the C cycle in Siberian rivers, we investigated the largest tributary of the Ob River, the Ket River basin, by measuring spatial and seasonal variations in carbon CO2 and CH4 concentrations and emissions together with hydrochemical analyses. The obtained results are useful for large-scale modeling of C emission and export fluxes from permafrost-free boreal rivers of an underrepresented region of the world.
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Short summary
In the boreal humic waters of a forest lake and bog, the rate of dissolved organic matter photodegradation is 4 times higher than that of biodegradation. However, given the shallow, light-penetrating layer, the biodegradation provides the largest contribution to CO2 emissions from water surfaces. Trace metals were partially removed (1–10 %) during photodegradation and biodegradation via precipitation of Fe(III) hydroxides after destabilization of organoferric colloids and organic complexes.
In the boreal humic waters of a forest lake and bog, the rate of dissolved organic matter...
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