Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia
Mobilization of dissolved organic carbon (DOC) and related trace elements (TEs) from the frozen peat to surface waters in the permafrost zone is expected to enhance under ongoing permafrost thaw and active layer thickness (ALT) deepening in high-latitude regions. The interstitial soil solutions are...
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ftdoajarticles:oai:doaj.org/article:02384a456cfb4aa7b638eccc30f2efee 2023-05-15T13:03:20+02:00 Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia T. V. Raudina S. V. Loiko A. G. Lim I. V. Krickov L. S. Shirokova G. I. Istigechev D. M. Kuzmina S. P. Kulizhsky S. N. Vorobyev O. S. Pokrovsky 2017-07-01T00:00:00Z https://doi.org/10.5194/bg-14-3561-2017 https://doaj.org/article/02384a456cfb4aa7b638eccc30f2efee EN eng Copernicus Publications https://www.biogeosciences.net/14/3561/2017/bg-14-3561-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-14-3561-2017 1726-4170 1726-4189 https://doaj.org/article/02384a456cfb4aa7b638eccc30f2efee Biogeosciences, Vol 14, Pp 3561-3584 (2017) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/bg-14-3561-2017 2022-12-30T21:16:28Z Mobilization of dissolved organic carbon (DOC) and related trace elements (TEs) from the frozen peat to surface waters in the permafrost zone is expected to enhance under ongoing permafrost thaw and active layer thickness (ALT) deepening in high-latitude regions. The interstitial soil solutions are efficient tracers of ongoing bio-geochemical processes in the critical zone and can help to decipher the intensity of carbon and metals migration from the soil to the rivers and further to the ocean. To this end, we collected, across a 640 km latitudinal transect of the sporadic to continuous permafrost zone of western Siberia peatlands, soil porewaters from 30 cm depth using suction cups and we analyzed DOC, dissolved inorganic carbon (DIC), and 40 major elements and TEs in 0.45 µm filtered fraction of 80 soil porewaters. Despite an expected decrease in the intensity of DOC and TE mobilization from the soil and vegetation litter to the interstitial fluids with the increase in the permafrost coverage and a decrease in the annual temperature and ALT, the DOC and many major and trace elements did not exhibit any distinct decrease in concentration along the latitudinal transect from 62.2 to 67.4° N. The DOC demonstrated a maximum of concentration at 66° N, on the border of the discontinuous/continuous permafrost zone, whereas the DOC concentration in peat soil solutions from the continuous permafrost zone was equal to or higher than that in the sporadic/discontinuous permafrost zone. Moreover, a number of major (Ca, Mg) and trace (Al, Ti, Sr, Ga, rare earth elements (REEs), Zr, Hf, Th) elements exhibited an increasing, not decreasing, northward concentration trend. We hypothesize that the effects of temperature and thickness of the ALT are of secondary importance relative to the leaching capacity of peat, which is in turn controlled by the water saturation of the peat core. The water residence time in peat pores also plays a role in enriching the fluids in some elements: the DOC, V, Cu, Pb, REEs, and Th were a factor of ... Article in Journal/Newspaper Active layer thickness permafrost Siberia Directory of Open Access Journals: DOAJ Articles Biogeosciences 14 14 3561 3584 |
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Directory of Open Access Journals: DOAJ Articles |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 T. V. Raudina S. V. Loiko A. G. Lim I. V. Krickov L. S. Shirokova G. I. Istigechev D. M. Kuzmina S. P. Kulizhsky S. N. Vorobyev O. S. Pokrovsky Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Mobilization of dissolved organic carbon (DOC) and related trace elements (TEs) from the frozen peat to surface waters in the permafrost zone is expected to enhance under ongoing permafrost thaw and active layer thickness (ALT) deepening in high-latitude regions. The interstitial soil solutions are efficient tracers of ongoing bio-geochemical processes in the critical zone and can help to decipher the intensity of carbon and metals migration from the soil to the rivers and further to the ocean. To this end, we collected, across a 640 km latitudinal transect of the sporadic to continuous permafrost zone of western Siberia peatlands, soil porewaters from 30 cm depth using suction cups and we analyzed DOC, dissolved inorganic carbon (DIC), and 40 major elements and TEs in 0.45 µm filtered fraction of 80 soil porewaters. Despite an expected decrease in the intensity of DOC and TE mobilization from the soil and vegetation litter to the interstitial fluids with the increase in the permafrost coverage and a decrease in the annual temperature and ALT, the DOC and many major and trace elements did not exhibit any distinct decrease in concentration along the latitudinal transect from 62.2 to 67.4° N. The DOC demonstrated a maximum of concentration at 66° N, on the border of the discontinuous/continuous permafrost zone, whereas the DOC concentration in peat soil solutions from the continuous permafrost zone was equal to or higher than that in the sporadic/discontinuous permafrost zone. Moreover, a number of major (Ca, Mg) and trace (Al, Ti, Sr, Ga, rare earth elements (REEs), Zr, Hf, Th) elements exhibited an increasing, not decreasing, northward concentration trend. We hypothesize that the effects of temperature and thickness of the ALT are of secondary importance relative to the leaching capacity of peat, which is in turn controlled by the water saturation of the peat core. The water residence time in peat pores also plays a role in enriching the fluids in some elements: the DOC, V, Cu, Pb, REEs, and Th were a factor of ... |
format |
Article in Journal/Newspaper |
author |
T. V. Raudina S. V. Loiko A. G. Lim I. V. Krickov L. S. Shirokova G. I. Istigechev D. M. Kuzmina S. P. Kulizhsky S. N. Vorobyev O. S. Pokrovsky |
author_facet |
T. V. Raudina S. V. Loiko A. G. Lim I. V. Krickov L. S. Shirokova G. I. Istigechev D. M. Kuzmina S. P. Kulizhsky S. N. Vorobyev O. S. Pokrovsky |
author_sort |
T. V. Raudina |
title |
Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia |
title_short |
Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia |
title_full |
Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia |
title_fullStr |
Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia |
title_full_unstemmed |
Dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western Siberia |
title_sort |
dissolved organic carbon and major and trace elements in peat porewater of sporadic, discontinuous, and continuous permafrost zones of western siberia |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-3561-2017 https://doaj.org/article/02384a456cfb4aa7b638eccc30f2efee |
genre |
Active layer thickness permafrost Siberia |
genre_facet |
Active layer thickness permafrost Siberia |
op_source |
Biogeosciences, Vol 14, Pp 3561-3584 (2017) |
op_relation |
https://www.biogeosciences.net/14/3561/2017/bg-14-3561-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-14-3561-2017 1726-4170 1726-4189 https://doaj.org/article/02384a456cfb4aa7b638eccc30f2efee |
op_doi |
https://doi.org/10.5194/bg-14-3561-2017 |
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Biogeosciences |
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14 |
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3561 |
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3584 |
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