A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations
International audience Natural and anthropogenic mercury (Hg) emissions are sequestered in terrestrial soils over short, annual to long, millennial timescales before Hg mobilization and run-off impact wetland and coastal ocean ecosystems. Recent studies have used Hg-to-carbon (C) ratios (R HgC '...
Published in: | Biogeosciences |
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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://insu.hal.science/insu-03661443 https://insu.hal.science/insu-03661443/document https://insu.hal.science/insu-03661443/file/bg-17-3083-2020.pdf https://doi.org/10.5194/bg-17-3083-2020 |
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openpolar |
institution |
Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey V. Kosykh, Natalia Pokrovsky, Oleg S. A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Natural and anthropogenic mercury (Hg) emissions are sequestered in terrestrial soils over short, annual to long, millennial timescales before Hg mobilization and run-off impact wetland and coastal ocean ecosystems. Recent studies have used Hg-to-carbon (C) ratios (R HgC 's) measured in Alaskan permafrost mineral and peat soils together with a northern circumpolar permafrost soil carbon inventory to estimate that these soils contain large amounts of Hg (between 184 and 755 Gg) in the upper 1 m. However, measurements of R HgC on Siberian permafrost peatlands are largely missing, leaving the size of the estimated northern soil Hg budget and its fate under Arctic warming scenarios uncertain. Here we present Hg and carbon data for six peat cores down to mineral horizons at 1.5-4 m depth, across a 1700 km latitudinal (56 to 67 ∘ N) permafrost gradient in the Western Siberian Lowland (WSL). Mercury concentrations increase from south to north in all soil horizons, reflecting a higher stability of sequestered Hg with respect to re-emission. The R HgC in the WSL peat horizons decreases with depth, from 0.38 Gg Pg -1 in the active layer to 0.23 Gg Pg -1 in continuously frozen peat of the WSL. We estimate the Hg pool (0-1 m) in the permafrost-affected part of the WSL peatlands to be 9.3±2.7 Gg. We review and estimate pan-Arctic organic and mineral soil R HgC to be 0.19 and 0.63 Gg Pg -1 , respectively, and use a soil carbon budget to revise the pan-Arctic permafrost soil Hg pool to be 72 Gg (39-91 Gg; interquartile range, IQR) in the upper 30 cm, 240 Gg (110-336 Gg) in the upper 1 m, and 597 Gg (384-750 Gg) in the upper 3 m. Using the same R HgC approach, we revise the upper 30 cm of the global soil Hg pool to contain 1086 Gg of Hg (852-1265 Gg, IQR), of which 7 % (72 Gg) resides in northern permafrost soils. Additional soil and river studies in eastern and northern Siberia are needed to lower the uncertainty on these estimates and assess the timing of Hg release to the atmosphere and rivers. |
author2 |
Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey V. Kosykh, Natalia Pokrovsky, Oleg S. |
author_facet |
Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey V. Kosykh, Natalia Pokrovsky, Oleg S. |
author_sort |
Lim, Artem G. |
title |
A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
title_short |
A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
title_full |
A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
title_fullStr |
A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
title_full_unstemmed |
A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
title_sort |
revised pan-arctic permafrost soil hg pool based on western siberian peat hg and carbon observations |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://insu.hal.science/insu-03661443 https://insu.hal.science/insu-03661443/document https://insu.hal.science/insu-03661443/file/bg-17-3083-2020.pdf https://doi.org/10.5194/bg-17-3083-2020 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Siberia |
genre_facet |
Arctic permafrost Siberia |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://insu.hal.science/insu-03661443 Biogeosciences, 2020, 17, pp.3083-3097. ⟨10.5194/bg-17-3083-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-17-3083-2020 insu-03661443 https://insu.hal.science/insu-03661443 https://insu.hal.science/insu-03661443/document https://insu.hal.science/insu-03661443/file/bg-17-3083-2020.pdf BIBCODE: 2020BGeo.17.3083L doi:10.5194/bg-17-3083-2020 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-17-3083-2020 |
container_title |
Biogeosciences |
container_volume |
17 |
container_issue |
12 |
container_start_page |
3083 |
op_container_end_page |
3097 |
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1785575014494371840 |
spelling |
ftinsu:oai:HAL:insu-03661443v1 2023-12-17T10:25:16+01:00 A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey V. Kosykh, Natalia Pokrovsky, Oleg S. Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 2020 https://insu.hal.science/insu-03661443 https://insu.hal.science/insu-03661443/document https://insu.hal.science/insu-03661443/file/bg-17-3083-2020.pdf https://doi.org/10.5194/bg-17-3083-2020 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-17-3083-2020 insu-03661443 https://insu.hal.science/insu-03661443 https://insu.hal.science/insu-03661443/document https://insu.hal.science/insu-03661443/file/bg-17-3083-2020.pdf BIBCODE: 2020BGeo.17.3083L doi:10.5194/bg-17-3083-2020 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://insu.hal.science/insu-03661443 Biogeosciences, 2020, 17, pp.3083-3097. ⟨10.5194/bg-17-3083-2020⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.5194/bg-17-3083-2020 2023-11-22T17:31:48Z International audience Natural and anthropogenic mercury (Hg) emissions are sequestered in terrestrial soils over short, annual to long, millennial timescales before Hg mobilization and run-off impact wetland and coastal ocean ecosystems. Recent studies have used Hg-to-carbon (C) ratios (R HgC 's) measured in Alaskan permafrost mineral and peat soils together with a northern circumpolar permafrost soil carbon inventory to estimate that these soils contain large amounts of Hg (between 184 and 755 Gg) in the upper 1 m. However, measurements of R HgC on Siberian permafrost peatlands are largely missing, leaving the size of the estimated northern soil Hg budget and its fate under Arctic warming scenarios uncertain. Here we present Hg and carbon data for six peat cores down to mineral horizons at 1.5-4 m depth, across a 1700 km latitudinal (56 to 67 ∘ N) permafrost gradient in the Western Siberian Lowland (WSL). Mercury concentrations increase from south to north in all soil horizons, reflecting a higher stability of sequestered Hg with respect to re-emission. The R HgC in the WSL peat horizons decreases with depth, from 0.38 Gg Pg -1 in the active layer to 0.23 Gg Pg -1 in continuously frozen peat of the WSL. We estimate the Hg pool (0-1 m) in the permafrost-affected part of the WSL peatlands to be 9.3±2.7 Gg. We review and estimate pan-Arctic organic and mineral soil R HgC to be 0.19 and 0.63 Gg Pg -1 , respectively, and use a soil carbon budget to revise the pan-Arctic permafrost soil Hg pool to be 72 Gg (39-91 Gg; interquartile range, IQR) in the upper 30 cm, 240 Gg (110-336 Gg) in the upper 1 m, and 597 Gg (384-750 Gg) in the upper 3 m. Using the same R HgC approach, we revise the upper 30 cm of the global soil Hg pool to contain 1086 Gg of Hg (852-1265 Gg, IQR), of which 7 % (72 Gg) resides in northern permafrost soils. Additional soil and river studies in eastern and northern Siberia are needed to lower the uncertainty on these estimates and assess the timing of Hg release to the atmosphere and rivers. Article in Journal/Newspaper Arctic permafrost Siberia Institut national des sciences de l'Univers: HAL-INSU Arctic Biogeosciences 17 12 3083 3097 |