Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges
International audience In the Arctic, the snowpack forms the major interface between atmospheric and terrestrial cycling of mercury (Hg), a global pollutant. We investigated Hg dynamics in an interior Arctic tundra snowpack in northern Alaska during two winter seasons. Using a snow tower system to m...
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Online Access: | https://doi.org/10.5194/tc-12-1939-2018 https://hal.sorbonne-universite.fr/hal-01829954/file/tc-12-1939-2018.pdf https://hal.sorbonne-universite.fr/hal-01829954 |
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fttriple:oai:gotriple.eu:10670/1.ilkn7d 2023-05-15T14:34:29+02:00 Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges Agnan, Yannick Douglas, Thomas, Helmig, Detlev Hueber, Jacques Obrist, Daniel Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS) Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC) 2018-06-06 https://doi.org/10.5194/tc-12-1939-2018 https://hal.sorbonne-universite.fr/hal-01829954/file/tc-12-1939-2018.pdf https://hal.sorbonne-universite.fr/hal-01829954 en eng HAL CCSD Copernicus hal-01829954 doi:10.5194/tc-12-1939-2018 10670/1.ilkn7d https://hal.sorbonne-universite.fr/hal-01829954/file/tc-12-1939-2018.pdf https://hal.sorbonne-universite.fr/hal-01829954 lic_creative-commons other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere The Cryosphere, Copernicus 2018, 12 (6), pp.1939 - 1956. ⟨10.5194/tc-12-1939-2018⟩ envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/tc-12-1939-2018 2023-01-22T16:48:27Z International audience In the Arctic, the snowpack forms the major interface between atmospheric and terrestrial cycling of mercury (Hg), a global pollutant. We investigated Hg dynamics in an interior Arctic tundra snowpack in northern Alaska during two winter seasons. Using a snow tower system to monitor Hg trace gas exchange, we observed consistent concentration declines of gaseous elemental Hg (Hg 0 gas) from the atmosphere to the snowpack to soils. The snowpack itself was unlikely a direct sink for atmospheric Hg 0 gas. In addition , there was no evidence of photochemical reduction of Hg II to Hg 0 gas in the tundra snowpack, with the exception of short periods during late winter in the uppermost snow layer. The patterns in this interior Arctic snowpack thus differ substantially from observations in Arctic coastal and temperate snowpacks. We consistently measured low concentrations of both total and dissolved Hg in snowpack throughout the two seasons. Chemical tracers showed that Hg was mainly associated with local mineral dust and regional marine sea spray inputs. Mass balance calculations show that the snowpack represents a small reservoir of Hg, resulting in low inputs during snowmelt. Taken together, the results from this study suggest that interior Arctic snowpacks are negligible sources of Hg to the Arctic. Article in Journal/Newspaper Arctic The Cryosphere Tundra Alaska Unknown Arctic The Cryosphere 12 6 1939 1956 |
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envir geo Agnan, Yannick Douglas, Thomas, Helmig, Detlev Hueber, Jacques Obrist, Daniel Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
topic_facet |
envir geo |
description |
International audience In the Arctic, the snowpack forms the major interface between atmospheric and terrestrial cycling of mercury (Hg), a global pollutant. We investigated Hg dynamics in an interior Arctic tundra snowpack in northern Alaska during two winter seasons. Using a snow tower system to monitor Hg trace gas exchange, we observed consistent concentration declines of gaseous elemental Hg (Hg 0 gas) from the atmosphere to the snowpack to soils. The snowpack itself was unlikely a direct sink for atmospheric Hg 0 gas. In addition , there was no evidence of photochemical reduction of Hg II to Hg 0 gas in the tundra snowpack, with the exception of short periods during late winter in the uppermost snow layer. The patterns in this interior Arctic snowpack thus differ substantially from observations in Arctic coastal and temperate snowpacks. We consistently measured low concentrations of both total and dissolved Hg in snowpack throughout the two seasons. Chemical tracers showed that Hg was mainly associated with local mineral dust and regional marine sea spray inputs. Mass balance calculations show that the snowpack represents a small reservoir of Hg, resulting in low inputs during snowmelt. Taken together, the results from this study suggest that interior Arctic snowpacks are negligible sources of Hg to the Arctic. |
author2 |
Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS) Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC) |
format |
Article in Journal/Newspaper |
author |
Agnan, Yannick Douglas, Thomas, Helmig, Detlev Hueber, Jacques Obrist, Daniel |
author_facet |
Agnan, Yannick Douglas, Thomas, Helmig, Detlev Hueber, Jacques Obrist, Daniel |
author_sort |
Agnan, Yannick |
title |
Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
title_short |
Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
title_full |
Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
title_fullStr |
Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
title_full_unstemmed |
Mercury in the Arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
title_sort |
mercury in the arctic tundra snowpack: temporal and spatial concentration patterns and trace gas exchanges |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-1939-2018 https://hal.sorbonne-universite.fr/hal-01829954/file/tc-12-1939-2018.pdf https://hal.sorbonne-universite.fr/hal-01829954 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic The Cryosphere Tundra Alaska |
genre_facet |
Arctic The Cryosphere Tundra Alaska |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere The Cryosphere, Copernicus 2018, 12 (6), pp.1939 - 1956. ⟨10.5194/tc-12-1939-2018⟩ |
op_relation |
hal-01829954 doi:10.5194/tc-12-1939-2018 10670/1.ilkn7d https://hal.sorbonne-universite.fr/hal-01829954/file/tc-12-1939-2018.pdf https://hal.sorbonne-universite.fr/hal-01829954 |
op_rights |
lic_creative-commons other |
op_doi |
https://doi.org/10.5194/tc-12-1939-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
6 |
container_start_page |
1939 |
op_container_end_page |
1956 |
_version_ |
1766307501502889984 |