Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra
International audience The tundra plays a pivotal role in the Arctic mercury (Hg) cycle by storing atmospheric Hg deposition and shuttling it to the Arctic Ocean. A recent study revealed that 70 % of the atmospheric Hg deposition to the tundra occurs through gaseous elemental mercury (GEM or Hg(0))...
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
2019
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412/document https://hal-insu.archives-ouvertes.fr/insu-03661412/file/bg-16-4051-2019.pdf https://doi.org/10.5194/bg-16-4051-2019 |
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ftunivnantes:oai:HAL:insu-03661412v1 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Jiskra, Martin Sonke, Jeroen E. Agnan, Yannick Helmig, Detlev Obrist, Daniel Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The tundra plays a pivotal role in the Arctic mercury (Hg) cycle by storing atmospheric Hg deposition and shuttling it to the Arctic Ocean. A recent study revealed that 70 % of the atmospheric Hg deposition to the tundra occurs through gaseous elemental mercury (GEM or Hg(0)) uptake by vegetation and soils. Processes controlling land-atmosphere exchange of Hg(0) in the Arctic tundra are central, but remain understudied. Here, we combine Hg stable isotope analysis of Hg(0) in the atmosphere, interstitial snow air, and soil pore air, with Hg(0) flux measurements in a tundra ecosystem at Toolik Field Station in northern Alaska (USA). In the dark winter months, planetary boundary layer (PBL) conditions and Hg(0) concentrations were generally stable throughout the day and small Hg(0) net deposition occurred. In spring, halogen-induced atmospheric mercury depletion events (AMDEs) occurred, with the fast re-emission of Hg(0) after AMDEs resulting in net emission fluxes of Hg(0). During the short snow-free growing season in summer, vegetation uptake of atmospheric Hg(0) enhanced atmospheric Hg(0) net deposition to the Arctic tundra. At night, when PBL conditions were stable, ecosystem uptake of atmospheric Hg(0) led to a depletion of atmospheric Hg(0). The night-time decline of atmospheric Hg(0) was concomitant with a depletion of lighter Hg(0) isotopes in the atmospheric Hg pool. The enrichment factor, ɛ 202 Hg<mi/>vegetationuptake=-4.2 ‰ (±1.0 ‰) was consistent with the preferential uptake of light Hg(0) isotopes by vegetation. Hg(0) flux measurements indicated a partial re-emission of Hg(0) during daytime, when solar radiation was strongest. Hg(0) concentrations in soil pore air were depleted relative to atmospheric Hg(0) concentrations, concomitant with an enrichment of lighter Hg(0) isotopes in the soil pore air, ɛ 202 Hg<mi/>soilair-atmosphere=-1.00 ‰ (±0.25 ‰) and E 199 Hg<mi/>soilair-atmosphere=0.07 ‰ (±0.04 ‰). These first Hg stable isotope measurements of Hg(0) in ... |
author2 |
Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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 |
Jiskra, Martin Sonke, Jeroen E. Agnan, Yannick Helmig, Detlev Obrist, Daniel |
author_facet |
Jiskra, Martin Sonke, Jeroen E. Agnan, Yannick Helmig, Detlev Obrist, Daniel |
author_sort |
Jiskra, Martin |
title |
Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra |
title_short |
Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra |
title_full |
Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra |
title_fullStr |
Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra |
title_full_unstemmed |
Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra |
title_sort |
insights from mercury stable isotopes on terrestrial-atmosphere exchange of hg(0) in the arctic tundra |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412/document https://hal-insu.archives-ouvertes.fr/insu-03661412/file/bg-16-4051-2019.pdf https://doi.org/10.5194/bg-16-4051-2019 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Tundra Alaska |
genre_facet |
Arctic Arctic Ocean Tundra Alaska |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal-insu.archives-ouvertes.fr/insu-03661412 Biogeosciences, 2019, 16, pp.4051-4064. ⟨10.5194/bg-16-4051-2019⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-16-4051-2019 insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412/document https://hal-insu.archives-ouvertes.fr/insu-03661412/file/bg-16-4051-2019.pdf BIBCODE: 2019BGeo.16.4051J doi:10.5194/bg-16-4051-2019 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-16-4051-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
20 |
container_start_page |
4051 |
op_container_end_page |
4064 |
_version_ |
1766322322440978432 |
spelling |
ftunivnantes:oai:HAL:insu-03661412v1 2023-05-15T14:51:16+02:00 Insights from mercury stable isotopes on terrestrial-atmosphere exchange of Hg(0) in the Arctic tundra Jiskra, Martin Sonke, Jeroen E. Agnan, Yannick Helmig, Detlev Obrist, Daniel Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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) 2019 https://hal-insu.archives-ouvertes.fr/insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412/document https://hal-insu.archives-ouvertes.fr/insu-03661412/file/bg-16-4051-2019.pdf https://doi.org/10.5194/bg-16-4051-2019 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-16-4051-2019 insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412 https://hal-insu.archives-ouvertes.fr/insu-03661412/document https://hal-insu.archives-ouvertes.fr/insu-03661412/file/bg-16-4051-2019.pdf BIBCODE: 2019BGeo.16.4051J doi:10.5194/bg-16-4051-2019 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal-insu.archives-ouvertes.fr/insu-03661412 Biogeosciences, 2019, 16, pp.4051-4064. ⟨10.5194/bg-16-4051-2019⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.5194/bg-16-4051-2019 2023-02-22T02:00:02Z International audience The tundra plays a pivotal role in the Arctic mercury (Hg) cycle by storing atmospheric Hg deposition and shuttling it to the Arctic Ocean. A recent study revealed that 70 % of the atmospheric Hg deposition to the tundra occurs through gaseous elemental mercury (GEM or Hg(0)) uptake by vegetation and soils. Processes controlling land-atmosphere exchange of Hg(0) in the Arctic tundra are central, but remain understudied. Here, we combine Hg stable isotope analysis of Hg(0) in the atmosphere, interstitial snow air, and soil pore air, with Hg(0) flux measurements in a tundra ecosystem at Toolik Field Station in northern Alaska (USA). In the dark winter months, planetary boundary layer (PBL) conditions and Hg(0) concentrations were generally stable throughout the day and small Hg(0) net deposition occurred. In spring, halogen-induced atmospheric mercury depletion events (AMDEs) occurred, with the fast re-emission of Hg(0) after AMDEs resulting in net emission fluxes of Hg(0). During the short snow-free growing season in summer, vegetation uptake of atmospheric Hg(0) enhanced atmospheric Hg(0) net deposition to the Arctic tundra. At night, when PBL conditions were stable, ecosystem uptake of atmospheric Hg(0) led to a depletion of atmospheric Hg(0). The night-time decline of atmospheric Hg(0) was concomitant with a depletion of lighter Hg(0) isotopes in the atmospheric Hg pool. The enrichment factor, ɛ 202 Hg<mi/>vegetationuptake=-4.2 ‰ (±1.0 ‰) was consistent with the preferential uptake of light Hg(0) isotopes by vegetation. Hg(0) flux measurements indicated a partial re-emission of Hg(0) during daytime, when solar radiation was strongest. Hg(0) concentrations in soil pore air were depleted relative to atmospheric Hg(0) concentrations, concomitant with an enrichment of lighter Hg(0) isotopes in the soil pore air, ɛ 202 Hg<mi/>soilair-atmosphere=-1.00 ‰ (±0.25 ‰) and E 199 Hg<mi/>soilair-atmosphere=0.07 ‰ (±0.04 ‰). These first Hg stable isotope measurements of Hg(0) in ... Article in Journal/Newspaper Arctic Arctic Ocean Tundra Alaska Université de Nantes: HAL-UNIV-NANTES Arctic Arctic Ocean Biogeosciences 16 20 4051 4064 |