Insights from mercury stable isotopes on terrestrial–atmosphere exchange of Hg(0) in the Arctic tundra
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 an...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2019
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-16-4051-2019 https://doaj.org/article/db781ee24bb34f09b4ae8c73f72879e4 |
id |
ftdoajarticles:oai:doaj.org/article:db781ee24bb34f09b4ae8c73f72879e4 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:db781ee24bb34f09b4ae8c73f72879e4 2023-05-15T14:50:10+02:00 Insights from mercury stable isotopes on terrestrial–atmosphere exchange of Hg(0) in the Arctic tundra M. Jiskra J. E. Sonke Y. Agnan D. Helmig D. Obrist 2019-10-01T00:00:00Z https://doi.org/10.5194/bg-16-4051-2019 https://doaj.org/article/db781ee24bb34f09b4ae8c73f72879e4 EN eng Copernicus Publications https://www.biogeosciences.net/16/4051/2019/bg-16-4051-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-4051-2019 1726-4170 1726-4189 https://doaj.org/article/db781ee24bb34f09b4ae8c73f72879e4 Biogeosciences, Vol 16, Pp 4051-4064 (2019) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/bg-16-4051-2019 2022-12-31T07:07:00Z 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, ε 202 Hg <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><msub><mi/><mrow><mi mathvariant="normal">vegetation</mi><mspace width="0.25em" linebreak="nobreak"/><mi mathvariant="normal">uptake</mi></mrow></msub><mo>=</mo><mo>-</mo><mn mathvariant="normal">4.2</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="101pt" height="14pt" class="svg-formula" dspmath="mathimg" ... Article in Journal/Newspaper Arctic Arctic Ocean Tundra Alaska Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Biogeosciences 16 20 4051 4064 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. Jiskra J. E. Sonke Y. Agnan D. Helmig D. Obrist Insights from mercury stable isotopes on terrestrial–atmosphere exchange of Hg(0) in the Arctic tundra |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
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, ε 202 Hg <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><msub><mi/><mrow><mi mathvariant="normal">vegetation</mi><mspace width="0.25em" linebreak="nobreak"/><mi mathvariant="normal">uptake</mi></mrow></msub><mo>=</mo><mo>-</mo><mn mathvariant="normal">4.2</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="101pt" height="14pt" class="svg-formula" dspmath="mathimg" ... |
format |
Article in Journal/Newspaper |
author |
M. Jiskra J. E. Sonke Y. Agnan D. Helmig D. Obrist |
author_facet |
M. Jiskra J. E. Sonke Y. Agnan D. Helmig D. Obrist |
author_sort |
M. Jiskra |
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 |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-4051-2019 https://doaj.org/article/db781ee24bb34f09b4ae8c73f72879e4 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Tundra Alaska |
genre_facet |
Arctic Arctic Ocean Tundra Alaska |
op_source |
Biogeosciences, Vol 16, Pp 4051-4064 (2019) |
op_relation |
https://www.biogeosciences.net/16/4051/2019/bg-16-4051-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-4051-2019 1726-4170 1726-4189 https://doaj.org/article/db781ee24bb34f09b4ae8c73f72879e4 |
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_ |
1766321215426789376 |