Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions
Gaseous elemental mercury (GEM) measurements at Alert, Canada, from 1995 to 2007 were analyzed for statistical time trends and for correlations with meteorological and climate data. A significant decreasing trend in annual GEM concentration is reported at Alert, with an estimated slope of −0.0086 ng...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00047215 2023-05-15T13:21:38+02:00 Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions Cole, A. S. Steffen, A. 2010-05 electronic https://doi.org/10.5194/acp-10-4661-2010 https://noa.gwlb.de/receive/cop_mods_00047215 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046835/acp-10-4661-2010.pdf https://acp.copernicus.org/articles/10/4661/2010/acp-10-4661-2010.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-10-4661-2010 https://noa.gwlb.de/receive/cop_mods_00047215 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046835/acp-10-4661-2010.pdf https://acp.copernicus.org/articles/10/4661/2010/acp-10-4661-2010.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2010 ftnonlinearchiv https://doi.org/10.5194/acp-10-4661-2010 2022-02-08T22:38:33Z Gaseous elemental mercury (GEM) measurements at Alert, Canada, from 1995 to 2007 were analyzed for statistical time trends and for correlations with meteorological and climate data. A significant decreasing trend in annual GEM concentration is reported at Alert, with an estimated slope of −0.0086 ng m−3 yr−1 (−0.6% yr−1) over this 13-year period. It is shown that there has been a shift in the month of minimum mean GEM concentration from May to April due to a change in the timing of springtime atmospheric mercury depletion events (AMDEs). These AMDEs are found to decrease with increasing local temperature within each month, both at Alert and at Amderma, Russia. These results support the temperature dependence suggested by previous experimental results and theoretical kinetic calculations on both bromine generation and mercury oxidation and highlight the potential for changes in Arctic mercury chemistry with climate. A correlation between total monthly AMDEs at Alert and the Polar/Eurasian Teleconnection Index was observed only in March, perhaps due to higher GEM inputs in early spring in those years with a weak polar vortex. A correlation of AMDEs at Alert with wind direction supports the origin of mercury depletion events over the Arctic Ocean, in agreement with a previous trajectory study of ozone depletion events. Interannual variability in total monthly depletion event frequency at Alert does not appear to correlate significantly with total or first-year northern hemispheric sea ice area or with other major teleconnection patterns. Nor do AMDEs at either Alert or Amderma correlate with local wind speed, as might be expected if depletion events are sustained by stable, low-turbulence atmospheric conditions. The data presented here – both the change in timing of depletion events and their relationship with temperature – can be used as additional constraints to improve the ability of models to predict the cycling and deposition of mercury in the Arctic. Article in Journal/Newspaper Amderma Arctic Arctic Ocean Sea ice Niedersächsisches Online-Archiv NOA Amderma ENVELOPE(61.666,61.666,69.758,69.758) Arctic Arctic Ocean Canada Atmospheric Chemistry and Physics 10 10 4661 4672 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Cole, A. S. Steffen, A. Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions |
topic_facet |
article Verlagsveröffentlichung |
description |
Gaseous elemental mercury (GEM) measurements at Alert, Canada, from 1995 to 2007 were analyzed for statistical time trends and for correlations with meteorological and climate data. A significant decreasing trend in annual GEM concentration is reported at Alert, with an estimated slope of −0.0086 ng m−3 yr−1 (−0.6% yr−1) over this 13-year period. It is shown that there has been a shift in the month of minimum mean GEM concentration from May to April due to a change in the timing of springtime atmospheric mercury depletion events (AMDEs). These AMDEs are found to decrease with increasing local temperature within each month, both at Alert and at Amderma, Russia. These results support the temperature dependence suggested by previous experimental results and theoretical kinetic calculations on both bromine generation and mercury oxidation and highlight the potential for changes in Arctic mercury chemistry with climate. A correlation between total monthly AMDEs at Alert and the Polar/Eurasian Teleconnection Index was observed only in March, perhaps due to higher GEM inputs in early spring in those years with a weak polar vortex. A correlation of AMDEs at Alert with wind direction supports the origin of mercury depletion events over the Arctic Ocean, in agreement with a previous trajectory study of ozone depletion events. Interannual variability in total monthly depletion event frequency at Alert does not appear to correlate significantly with total or first-year northern hemispheric sea ice area or with other major teleconnection patterns. Nor do AMDEs at either Alert or Amderma correlate with local wind speed, as might be expected if depletion events are sustained by stable, low-turbulence atmospheric conditions. The data presented here – both the change in timing of depletion events and their relationship with temperature – can be used as additional constraints to improve the ability of models to predict the cycling and deposition of mercury in the Arctic. |
format |
Article in Journal/Newspaper |
author |
Cole, A. S. Steffen, A. |
author_facet |
Cole, A. S. Steffen, A. |
author_sort |
Cole, A. S. |
title |
Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions |
title_short |
Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions |
title_full |
Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions |
title_fullStr |
Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions |
title_full_unstemmed |
Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions |
title_sort |
trends in long-term gaseous mercury observations in the arctic and effects of temperature and other atmospheric conditions |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/acp-10-4661-2010 https://noa.gwlb.de/receive/cop_mods_00047215 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046835/acp-10-4661-2010.pdf https://acp.copernicus.org/articles/10/4661/2010/acp-10-4661-2010.pdf |
long_lat |
ENVELOPE(61.666,61.666,69.758,69.758) |
geographic |
Amderma Arctic Arctic Ocean Canada |
geographic_facet |
Amderma Arctic Arctic Ocean Canada |
genre |
Amderma Arctic Arctic Ocean Sea ice |
genre_facet |
Amderma Arctic Arctic Ocean Sea ice |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-10-4661-2010 https://noa.gwlb.de/receive/cop_mods_00047215 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046835/acp-10-4661-2010.pdf https://acp.copernicus.org/articles/10/4661/2010/acp-10-4661-2010.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-10-4661-2010 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
10 |
container_issue |
10 |
container_start_page |
4661 |
op_container_end_page |
4672 |
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1766360696420827136 |