Western Siberia wetlands as indicator and regulator of climate change on the global scale

Kirpotin, Sergey N.; Berezin, A.E.; Bazanov, V. A.; Polishchuk, Yu. M.; Vorobiov, S.N.; Mironycheva-Tokoreva, N; Kosykh, Natalia P.; Volkova, Irina I.; Dupré, Bernard; Pokrovsky, Oleg S.; Kouraev, Alexei V.; Zakharova, Elena; Shirokova, Liudmila S.; Mognard, N. M.; Biancamaria, Sylvain; Viers, Jérôme; Kolmakova, Maria

doi:10.1080/00207230902753056

Cited by 65 publications

(52 citation statements)

References 10 publications

(12 reference statements)

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“…This is a zone of continuous/discontinuous permafrost abundance with the average maximal depth of the active layer being close to 0.5-1.0 m. The lakes here are forming and draining through permafrost thawing and peat abrasion from the coast following the sequence 'frozen peat mound -thermokarst subsidence -thermokarst lake -drained lake -young khasyrey -mature khasyrey' [12,13]. Figure 1A.…”

Section: Methodsmentioning

confidence: 96%

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO₂flux to the atmosphere

Shirokova

Pokrovsky

Kirpotin

et al. 2009

International Journal of Environmental Studies

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This work reports on results of bacterio-plankton characterisation in thaw lakes of the northern part of Western Siberia via measurement the number of various groups of heterotrophic bacteria and the intensity of primary production/respiration in the water column. The eutrophic systems at the beginning of lake formation (permafrost thawing) are being replaced by essentially oligotrophic systems at the final, mature stage of the lake development (khasyrey). The CO 2 flux from the lake surface to the atmosphere associated with microbial degradation of organic matter (107 ± 50 t C/km 2 /y) is at least one order of magnitude higher than the riverine organic carbon flux. The future climate evolution in this region, consisting in rising ground temperature and precipitation increase will bring about further acceleration of dissolved organic matter degradation in the water column and amplification of CO 2 release to the atmosphere.

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Section: Methodsmentioning

confidence: 96%

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO₂flux to the atmosphere

Shirokova

Pokrovsky

Kirpotin

et al. 2009

International Journal of Environmental Studies

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“…At present, the thermokarst is the leading cryogenic process in the subarctic area of Western Siberia and there is a linear character to the cyclic succession of development of palsa [3]. Landslide permafrost melting [3] in the West Siberian cryolithozone which, according to our observations, started at the beginning of the twentyfirst century, has notably changed the landscape pattern: the number of bog hollows and embryonic lakes has increased as well as the number of drained thaw lake basins (occupied by cotton-grass-sedge-sphagnum swamps) in the southern part of the permafrost zone and the number of expanding lakes in its northern part has increased [54]. When we were studying these processes in the Noviy-Urengoy-Pangody area near the Polar Circle in August of 2004, we discovered that the degree of thermokarst activity was unusually increased compared to the early 1990s.…”

Section: Present Day Climate Driven Changes Of Palsa Peatlands In Wesmentioning

confidence: 98%

“…We have used radar altimeter data from ENVISAT satellite, operated since November 2002. The repeat period for ENVISAT is 35 days and its ground tracks provide a homogeneous coverage of the watershed of these four rivers (for more details see [54]). While the theoretical footprint of the altimeter data is about 12 km, the main part of the backscatter signal comes from a small area with a diameter of 1-2 km, which occurs in the case of the quasi-specular signal over ice or calm water (mires, small lakes).…”

Section: Seasonal Changes Of Hydrological Conditions In the Palsa Regmentioning

confidence: 99%

West Siberian palsa peatlands: distribution, typology, cyclic development, present day climate-driven changes, seasonal hydrology and impact on CO₂cycle

Kirpotin

Polishchuk

Bryksina

et al. 2011

International Journal of Environmental Studies

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Palsa peatlands occupy extensive areas in Western Siberia which is one of the most paludified flat lowlands of the world. Climatic changes in Western Siberia are more dramatic compared with other northern regions, and changes in palsa landscapes are more notable due to the severe continental climate here. The distribution, peculiarities and climate-indication capacities of West Siberian palsas are poorly known outside Russia. Thus, Western Siberia is one of the most interesting vast natural polygons for studying climate-driven changes in the landscapes. This paper aims to fill the gap in knowledge on West Siberian palsas and their capacity as a climate regulator. We present issues in distribution, typology and cyclic development of palsa peatlands and their actual climate-driven changes. We also analyse the role of palsas in the atmospheric cycle of CO 2 , and the hydrology of the palsa regions.

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“…5.1). Then, these estimates were extrapolated over the Northern part of the Western Siberia peatlands area assuming again a surface area represented by lakes of 30-60 % of the total area Kirpotin et al, 2009). The resulting stocks of trace elements are reported in Table 5.…”

Section: Environmental Significance and Conclusionmentioning

confidence: 99%

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

et al. 2011

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Abstract. This study reports the very first results on highresolution sampling of sediments and their porewaters from three thermokarst (thaw) lakes representing different stages of ecosystem development located within the Nadym-Pur interfluve of the Western Siberia plain. Up to present time, the lake sediments of this and other permafrost-affected regions remain unexplored regarding their biogeochemical behavior. The aim of this study was to (i) document the early diagenesic processes in order to assess their impact on the organic carbon stored in the underlying permafrost, and (ii) characterize the post-depositional redistribution of trace elements and their impact on the water column. The estimated organic carbon (OC) stock in thermokarst lake sediments of 14 ± 2 kg m −2 is low compared to that reported for peat soils from the same region and denotes intense organic matter (OM) mineralization. Mineralization of OM in the thermokarst lake sediments proceeds under anoxic conditions in all the three lakes. In the course of the lake development, a shift in mineralization pathways from nitrate and sulfate to Fe-and Mn-oxyhydroxides as the main terminal electron acceptors in the early diagenetic reactions was suggested. This shift was likely promoted by the diagenetic consumption of nitrate and sulfate and their gradual depletion in the water column due to progressively decreasing frozen peat lixiviation occurring at the lake's borders. Trace elements were mobilized from host phases (OM and Fe-and Mn-oxyhydroxides) and partly sequestered in the sediment in the form of authigenic Fe-sulfides. Arsenic and Sb cycling was also closely linked to that of OM and Fe-and Mnoxyhydroxides. Shallow diagenetic enrichment of particulate Sb was observed in the less mature stages. As a result of auCorrespondence to: S. Audry (stephane.audry@get.obs-mip.fr) thigenic sulfide precipitation, the sediments of the early stage of ecosystem development were a sink for water column Cu, Zn, Cd, Pb and Sb. In contrast, at all stages of ecosystem development, the sediments were a source of dissolved Co, Ni and As to the water column. However, the concentrations of these trace elements remained low in the bottom waters, indicating that sorption processes on Fe-bounding particles and/or large-size organo-mineral colloids could mitigate the impact of post-depositional redistribution of toxic elements on the water column.

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Western Siberia wetlands as indicator and regulator of climate change on the global scale

Cited by 65 publications

References 10 publications

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO₂flux to the atmosphere

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO₂flux to the atmosphere

West Siberian palsa peatlands: distribution, typology, cyclic development, present day climate-driven changes, seasonal hydrology and impact on CO₂cycle

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

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Western Siberia wetlands as indicator and regulator of climate change on the global scale

Cited by 65 publications

References 10 publications

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO2flux to the atmosphere

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO2flux to the atmosphere

West Siberian palsa peatlands: distribution, typology, cyclic development, present day climate-driven changes, seasonal hydrology and impact on CO2cycle

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

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Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO₂flux to the atmosphere

Heterotrophic bacterio‐plankton in thawed lakes of the northern part of Western Siberia controls the CO₂flux to the atmosphere

West Siberian palsa peatlands: distribution, typology, cyclic development, present day climate-driven changes, seasonal hydrology and impact on CO₂cycle