Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia
Despite relatively good knowledge of the biogeochemistry of Siberian thermokarst lakes during summer base flow, their seasonal dynamics remains almost unexplored. This work describes the chemical composition of ~130 thermokarst lakes ranging in size from a few m 2 to several km 2 , located in the di...
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ftdoajarticles:oai:doaj.org/article:1f367ac5b0dc4295bc9b5267a4e6855c 2023-05-15T16:37:22+02:00 Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia R. M. Manasypov S. N. Vorobyev S. V. Loiko I. V. Kritzkov L. S. Shirokova V. P. Shevchenko S. N. Kirpotin S. P. Kulizhsky L. G. Kolesnichenko V. A. Zemtzov V. V. Sinkinov O. S. Pokrovsky 2015-05-01T00:00:00Z https://doi.org/10.5194/bg-12-3009-2015 https://doaj.org/article/1f367ac5b0dc4295bc9b5267a4e6855c EN eng Copernicus Publications http://www.biogeosciences.net/12/3009/2015/bg-12-3009-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-3009-2015 https://doaj.org/article/1f367ac5b0dc4295bc9b5267a4e6855c Biogeosciences, Vol 12, Iss 10, Pp 3009-3028 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-3009-2015 2022-12-30T22:46:13Z Despite relatively good knowledge of the biogeochemistry of Siberian thermokarst lakes during summer base flow, their seasonal dynamics remains almost unexplored. This work describes the chemical composition of ~130 thermokarst lakes ranging in size from a few m 2 to several km 2 , located in the discontinuous permafrost zone. Lakes were sampled during spring flood, just after the ice break (early June), the end of summer (August), the beginning of ice formation (October) and during the full freezing season in winter (February). The lakes larger than 1000 m 2 did not exhibit any statistically significant control of the lake size on dissolved organic carbon (DOC), the major and trace element concentrations over three major open water seasons. On the annual scale, the majority of dissolved elements including organic carbon increased their concentration from 30 to 500%, with a statistically significant ( p < 0.05) trend from spring to winter. The concentrations of most trace elements (TEs) increased in the order spring > summer > autumn > winter. The ice formation in October included several stages: first, surface layer freezing followed by crack (fissure) formation with unfrozen water from the deeper layers spreading over the ice surface. This water was subsequently frozen and formed layered ice rich in organic matter. As a result, the DOC and metal (Mn, Fe, Ni, Cu, Zn, As, Ba and Pb) concentrations were highest near the surface of the ice column (0 to 20 cm) and decreased by a factor of 2 towards the bottom. The main implications of discovered freeze-driven solute concentrations in thermokarst lake waters are enhanced colloidal coagulation and removal of dissolved organic matter and associated insoluble metals from the water column to the sediments. The measured distribution coefficients of a TE between amorphous organo-ferric coagulates and lake water (<0.45 μm) were similar to those reported earlier for Fe-rich colloids and low molecular weight (<1 kDa, or <1–2 nm) fractions of thermokarst ... Article in Journal/Newspaper Ice permafrost Thermokarst Siberia Directory of Open Access Journals: DOAJ Articles Biogeosciences 12 10 3009 3028 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 R. M. Manasypov S. N. Vorobyev S. V. Loiko I. V. Kritzkov L. S. Shirokova V. P. Shevchenko S. N. Kirpotin S. P. Kulizhsky L. G. Kolesnichenko V. A. Zemtzov V. V. Sinkinov O. S. Pokrovsky Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Despite relatively good knowledge of the biogeochemistry of Siberian thermokarst lakes during summer base flow, their seasonal dynamics remains almost unexplored. This work describes the chemical composition of ~130 thermokarst lakes ranging in size from a few m 2 to several km 2 , located in the discontinuous permafrost zone. Lakes were sampled during spring flood, just after the ice break (early June), the end of summer (August), the beginning of ice formation (October) and during the full freezing season in winter (February). The lakes larger than 1000 m 2 did not exhibit any statistically significant control of the lake size on dissolved organic carbon (DOC), the major and trace element concentrations over three major open water seasons. On the annual scale, the majority of dissolved elements including organic carbon increased their concentration from 30 to 500%, with a statistically significant ( p < 0.05) trend from spring to winter. The concentrations of most trace elements (TEs) increased in the order spring > summer > autumn > winter. The ice formation in October included several stages: first, surface layer freezing followed by crack (fissure) formation with unfrozen water from the deeper layers spreading over the ice surface. This water was subsequently frozen and formed layered ice rich in organic matter. As a result, the DOC and metal (Mn, Fe, Ni, Cu, Zn, As, Ba and Pb) concentrations were highest near the surface of the ice column (0 to 20 cm) and decreased by a factor of 2 towards the bottom. The main implications of discovered freeze-driven solute concentrations in thermokarst lake waters are enhanced colloidal coagulation and removal of dissolved organic matter and associated insoluble metals from the water column to the sediments. The measured distribution coefficients of a TE between amorphous organo-ferric coagulates and lake water (<0.45 μm) were similar to those reported earlier for Fe-rich colloids and low molecular weight (<1 kDa, or <1–2 nm) fractions of thermokarst ... |
format |
Article in Journal/Newspaper |
author |
R. M. Manasypov S. N. Vorobyev S. V. Loiko I. V. Kritzkov L. S. Shirokova V. P. Shevchenko S. N. Kirpotin S. P. Kulizhsky L. G. Kolesnichenko V. A. Zemtzov V. V. Sinkinov O. S. Pokrovsky |
author_facet |
R. M. Manasypov S. N. Vorobyev S. V. Loiko I. V. Kritzkov L. S. Shirokova V. P. Shevchenko S. N. Kirpotin S. P. Kulizhsky L. G. Kolesnichenko V. A. Zemtzov V. V. Sinkinov O. S. Pokrovsky |
author_sort |
R. M. Manasypov |
title |
Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia |
title_short |
Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia |
title_full |
Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia |
title_fullStr |
Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia |
title_full_unstemmed |
Seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western Siberia |
title_sort |
seasonal dynamics of organic carbon and metals in thermokarst lakes from the discontinuous permafrost zone of western siberia |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-3009-2015 https://doaj.org/article/1f367ac5b0dc4295bc9b5267a4e6855c |
genre |
Ice permafrost Thermokarst Siberia |
genre_facet |
Ice permafrost Thermokarst Siberia |
op_source |
Biogeosciences, Vol 12, Iss 10, Pp 3009-3028 (2015) |
op_relation |
http://www.biogeosciences.net/12/3009/2015/bg-12-3009-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-3009-2015 https://doaj.org/article/1f367ac5b0dc4295bc9b5267a4e6855c |
op_doi |
https://doi.org/10.5194/bg-12-3009-2015 |
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Biogeosciences |
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12 |
container_issue |
10 |
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3009 |
op_container_end_page |
3028 |
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1766027667870580736 |