Methane in West Siberia Terrestrial Seeps: Origin, Transport, and Metabolic Pathways of Production | Sciact - CRIS-system of Boreskov Institute of Catalysis

Methane in West Siberia Terrestrial Seeps: Origin, Transport, and Metabolic Pathways of Production Full article

Journal

Global Change Biology
ISSN: 1365-2486

Output data

Year: 2023, Volume: 29, Number: 18, Pages: 5334-5351 Pages count : 18 DOI: 10.1111/gcb.16863

Tags

groundwater methane; metabolic pathways; methane biogeochemistry; northern peatlands; stable isotopes

Authors

Sabrekov Aleksandr F. ^1,2 , Terentieva Irina E. ³ , McDermid Gregory J. ³ , Litti Yuriy V. ⁴ , Prokushkin Anatoly S. ⁵ , Glagolev Mikhail V. ^1,6 , Petrozhitskiy Alexey V. ^7,8 , Kalinkin Peter N. ⁹ , Kuleshov Dmitry V. ^8,10 , Parkhomchuk Ekaterina V. ^8,10

Affiliations

1	UNESCO Department “Environmental Dynamics and Global Climate Changes”, Ugra State University, Khanty-Mansiysk, Russia
2	V.N. Sukachev Laboratory of Biogeocenology, A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia
3	Department of Geography, University of Calgary, Calgary, Canada
4	Laboratory of Microbiology of Anthropogenic Habitats, Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, Moscow, Russia
5	Laboratory of Biogeochemical Cycles in Forest Ecosystems, VN Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia
6	Department of Physics and Reclamation, Faculty of Soil Science, Lomonosov Moscow State University, Moscow, Russia
7	Laboratory 5-2, Budker Institute of Nuclear Physics SB RAS, Novosibirsk, Russia
8	AMS Golden Valley, Novosibirsk State University, Novosibirsk, Russia
9	The Group of Template Synthesis, Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
10	Laboratory AIsotope, Institute of Archaeology and Ethnography SB RAS, Novosibirsk, Russia

Funding (2)

1	Правительство Тюменской области
2	Russian Science Foundation	19-77-10074 (122032300076-2)

The expansive plains of West Siberia contain globally significant carbon stocks, with Earth's most extensive peatland complex overlying the world's largest-known hydrocarbon basin. Numerous terrestrial methane seeps have recently been discovered on this landscape, located along the floodplains of the Ob and Irtysh Rivers in hotspots covering more than 2500 km2. We articulated three hypotheses to explain the origin and migration pathways of methane within these seeps: (H1) uplift of Cretaceous-aged methane from deep petroleum reservoirs along faults and fractures, (H2) release of Oligocene-aged methane capped or trapped by degrading permafrost, and (H3) horizontal migration of Holocene-aged methane from surrounding peatlands. We tested these hypotheses using a range of geochemical tools on gas and water samples extracted from seeps, peatlands, and aquifers across the 120,000 km2 study area. Seep-gas composition, radiocarbon age, and stable isotope fingerprints favor the peatland hypothesis of seep-methane origin (H3). Organic matter in raised bogs is the primary source of seep methane, but observed variability in stable isotope composition and concentration suggest production in two divergent biogeochemical settings that support distinct metabolic pathways of methanogenesis. Comparison of these parameters in raised bogs and seeps indicates that the first is bogs, via CO2 reduction methanogenesis. The second setting is likely groundwater, where dissolved organic carbon from bogs is degraded via chemolithotrophic acetogenesis followed by acetate fermentation methanogenesis. Our findings highlight the importance of methane lateral migration in West Siberia's bog-dominated landscapes via intimate groundwater connections. The same phenomenon could occur in similar landscapes across the boreal-taiga biome, thereby making groundwater-fed rivers and springs potent methane sources.

Sabrekov A.F. , Terentieva I.E. , McDermid G.J. , Litti Y.V. , Prokushkin A.S. , Glagolev M.V. , Petrozhitskiy A.V. , Kalinkin P.N. , Kuleshov D.V. , Parkhomchuk E.V.
Methane in West Siberia Terrestrial Seeps: Origin, Transport, and Metabolic Pathways of Production
Global Change Biology. 2023. V.29. N18. P.5334-5351. DOI: 10.1111/gcb.16863 WOS Scopus РИНЦ AN PMID OpenAlex

Submitted:	Mar 23, 2023
Accepted:	Jun 20, 2023
Published online:	Jul 6, 2023
Published print:	Sep 1, 2023

Web of science:	WOS:001024130700001
Scopus:	2-s2.0-85164509191
Elibrary:	54288712
Chemical Abstracts:	2023:1433466
PMID:	37409557
OpenAlex:	W4383301895

DB	Citing
Scopus	4
Web of science	3
OpenAlex	3
Elibrary	4