A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations
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...
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COPERNICUS GESELLSCHAFT MBH
2020
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Online Access: | https://edoc.unibas.ch/79583/ https://doi.org/10.5194/bg-17-3083-2020 |
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ftunivbasel:oai:edoc.unibas.ch:79583 2023-05-15T14:26:11+02:00 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 Kosykh, Natalia Pokrovsky, Oleg S. 2020 https://edoc.unibas.ch/79583/ https://doi.org/10.5194/bg-17-3083-2020 unknown COPERNICUS GESELLSCHAFT MBH Lim, Artem G. and Jiskra, Martin and Sonke, Jeroen E. and Loiko, Sergey and Kosykh, Natalia and Pokrovsky, Oleg S. (2020) A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations. BIOGEOSCIENCES, 17 (12). pp. 3083-3097. doi:10.5194/bg-17-3083-2020 info:isi/000542923400002 urn:ISSN:1726-4170 info:eu-repo/semantics/closedAccess Article PeerReviewed 2020 ftunivbasel https://doi.org/10.5194/bg-17-3083-2020 2023-03-05T07:26:39Z 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 degrees 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 GgPg(-1) in the active layer to 0.23 GgPg(-1) in continuously frozen peat of the WSL. We estimate the Hg pool (01 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 RHgC to be 0.19 and 0.63 GgPg(-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 Arctic permafrost Siberia University of Basel: edoc Arctic Biogeosciences 17 12 3083 3097 |
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Open Polar |
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University of Basel: edoc |
op_collection_id |
ftunivbasel |
language |
unknown |
description |
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 degrees 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 GgPg(-1) in the active layer to 0.23 GgPg(-1) in continuously frozen peat of the WSL. We estimate the Hg pool (01 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 RHgC to be 0.19 and 0.63 GgPg(-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. |
format |
Article in Journal/Newspaper |
author |
Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey Kosykh, Natalia Pokrovsky, Oleg S. |
spellingShingle |
Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey Kosykh, Natalia Pokrovsky, Oleg S. A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations |
author_facet |
Lim, Artem G. Jiskra, Martin Sonke, Jeroen E. Loiko, Sergey 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 |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2020 |
url |
https://edoc.unibas.ch/79583/ https://doi.org/10.5194/bg-17-3083-2020 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic permafrost Siberia |
genre_facet |
Arctic Arctic permafrost Siberia |
op_relation |
Lim, Artem G. and Jiskra, Martin and Sonke, Jeroen E. and Loiko, Sergey and Kosykh, Natalia and Pokrovsky, Oleg S. (2020) A revised pan-Arctic permafrost soil Hg pool based on Western Siberian peat Hg and carbon observations. BIOGEOSCIENCES, 17 (12). pp. 3083-3097. doi:10.5194/bg-17-3083-2020 info:isi/000542923400002 urn:ISSN:1726-4170 |
op_rights |
info:eu-repo/semantics/closedAccess |
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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1766298661472436224 |