Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017
Mercury is ubiquitous in the atmosphere, and atmospheric transport is an important source for this element in the Arctic. Measurements of gaseous elemental mercury (GEM) have been carried out at Villum Research Station (Villum) at Station Nord, situated in northern Greenland. The measurements cover...
Published in: | Atmospheric Chemistry and Physics |
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2020
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Online Access: | https://pure.au.dk/portal/en/publications/e973dc0f-e94f-4431-b018-c7dfa3a93826 https://doi.org/10.5194/acp-20-13253-2020 http://www.scopus.com/inward/record.url?scp=85096158602&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/e973dc0f-e94f-4431-b018-c7dfa3a93826 2024-04-14T08:08:38+00:00 Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 Skov, Henrik Hjorth, Jens Nordstrøm, Claus Jensen, Bjarne Christoffersen, Christel Poulsen, Maria Bech Liisberg, Jesper Baldtzer Beddows, David Dall'Osto, Manuel Christensen, Jesper Heile 2020 https://pure.au.dk/portal/en/publications/e973dc0f-e94f-4431-b018-c7dfa3a93826 https://doi.org/10.5194/acp-20-13253-2020 http://www.scopus.com/inward/record.url?scp=85096158602&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/e973dc0f-e94f-4431-b018-c7dfa3a93826 info:eu-repo/semantics/openAccess Skov , H , Hjorth , J , Nordstrøm , C , Jensen , B , Christoffersen , C , Poulsen , M B , Liisberg , J B , Beddows , D , Dall'Osto , M & Christensen , J H 2020 , ' Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 ' , Atmospheric Chemistry and Physics , vol. 20 , no. 21 , pp. 13253-13266 . https://doi.org/10.5194/acp-20-13253-2020 10-YEAR TRENDS AIR-POLLUTION MODEL ATMOSPHERIC MERCURY DEPENDENT RATE COEFFICIENTS DEPOSITION EMISSIONS FLUXES SPRINGTIME DEPLETION TRANSPORT WATER article 2020 ftuniaarhuspubl https://doi.org/10.5194/acp-20-13253-2020 2024-03-21T15:29:32Z Mercury is ubiquitous in the atmosphere, and atmospheric transport is an important source for this element in the Arctic. Measurements of gaseous elemental mercury (GEM) have been carried out at Villum Research Station (Villum) at Station Nord, situated in northern Greenland. The measurements cover the period 1999–2017, with a gap in the data for the period 2003–2008 (for a total of 11 years). The measurements were compared with model results from the Danish Eulerian Hemispheric Model (DEHM) that describes the contribution from direct anthropogenic transport, marine emissions and general background concentration. The percentage of time spent over different surfaces was calculated by back-trajectory analysis, and the reaction kinetics were determined by a comparison with ozone. The GEM measurements were analysed for trends, both seasonal and annual. The only significant trends found were negative ones for the winter and autumn months. Comparison of the measurements to simulations using the Danish Eulerian Hemispheric Model (DEHM) indicated that direct transport of anthropogenic emissions of mercury accounts for between 14% and 17% of the measured mercury. Analysis of the kinetics of the observed atmospheric mercury depletion events (AMDEs) confirms the results of a previous study at Villum of the competing reactions of GEM and ozone with Br, which suggests that the lifetime of GEM is about a month. However, a GEM lifetime of 12 months gave the best agreement between the model and measurements. The chemical lifetime is shorter, and thus, the apparent lifetime appears to be the result of deposition followed by reduction and reemission; for this reason, the term “relaxation time” is preferred to “lifetime” for GEM. The relaxation time for GEM causes a delay between emission reductions and the effect on actual concentrations. No significant annual trend was found for the measured concentrations of GEM over the measurement period, despite emission reductions. This is interesting, and together with low direct transport ... Article in Journal/Newspaper Arctic Greenland North Greenland Aarhus University: Research Arctic Greenland Station Nord ENVELOPE(-16.663,-16.663,81.599,81.599) Atmospheric Chemistry and Physics 20 21 13253 13265 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
10-YEAR TRENDS AIR-POLLUTION MODEL ATMOSPHERIC MERCURY DEPENDENT RATE COEFFICIENTS DEPOSITION EMISSIONS FLUXES SPRINGTIME DEPLETION TRANSPORT WATER |
spellingShingle |
10-YEAR TRENDS AIR-POLLUTION MODEL ATMOSPHERIC MERCURY DEPENDENT RATE COEFFICIENTS DEPOSITION EMISSIONS FLUXES SPRINGTIME DEPLETION TRANSPORT WATER Skov, Henrik Hjorth, Jens Nordstrøm, Claus Jensen, Bjarne Christoffersen, Christel Poulsen, Maria Bech Liisberg, Jesper Baldtzer Beddows, David Dall'Osto, Manuel Christensen, Jesper Heile Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 |
topic_facet |
10-YEAR TRENDS AIR-POLLUTION MODEL ATMOSPHERIC MERCURY DEPENDENT RATE COEFFICIENTS DEPOSITION EMISSIONS FLUXES SPRINGTIME DEPLETION TRANSPORT WATER |
description |
Mercury is ubiquitous in the atmosphere, and atmospheric transport is an important source for this element in the Arctic. Measurements of gaseous elemental mercury (GEM) have been carried out at Villum Research Station (Villum) at Station Nord, situated in northern Greenland. The measurements cover the period 1999–2017, with a gap in the data for the period 2003–2008 (for a total of 11 years). The measurements were compared with model results from the Danish Eulerian Hemispheric Model (DEHM) that describes the contribution from direct anthropogenic transport, marine emissions and general background concentration. The percentage of time spent over different surfaces was calculated by back-trajectory analysis, and the reaction kinetics were determined by a comparison with ozone. The GEM measurements were analysed for trends, both seasonal and annual. The only significant trends found were negative ones for the winter and autumn months. Comparison of the measurements to simulations using the Danish Eulerian Hemispheric Model (DEHM) indicated that direct transport of anthropogenic emissions of mercury accounts for between 14% and 17% of the measured mercury. Analysis of the kinetics of the observed atmospheric mercury depletion events (AMDEs) confirms the results of a previous study at Villum of the competing reactions of GEM and ozone with Br, which suggests that the lifetime of GEM is about a month. However, a GEM lifetime of 12 months gave the best agreement between the model and measurements. The chemical lifetime is shorter, and thus, the apparent lifetime appears to be the result of deposition followed by reduction and reemission; for this reason, the term “relaxation time” is preferred to “lifetime” for GEM. The relaxation time for GEM causes a delay between emission reductions and the effect on actual concentrations. No significant annual trend was found for the measured concentrations of GEM over the measurement period, despite emission reductions. This is interesting, and together with low direct transport ... |
format |
Article in Journal/Newspaper |
author |
Skov, Henrik Hjorth, Jens Nordstrøm, Claus Jensen, Bjarne Christoffersen, Christel Poulsen, Maria Bech Liisberg, Jesper Baldtzer Beddows, David Dall'Osto, Manuel Christensen, Jesper Heile |
author_facet |
Skov, Henrik Hjorth, Jens Nordstrøm, Claus Jensen, Bjarne Christoffersen, Christel Poulsen, Maria Bech Liisberg, Jesper Baldtzer Beddows, David Dall'Osto, Manuel Christensen, Jesper Heile |
author_sort |
Skov, Henrik |
title |
Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 |
title_short |
Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 |
title_full |
Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 |
title_fullStr |
Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 |
title_full_unstemmed |
Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 |
title_sort |
variability in gaseous elemental mercury at villum research station, station nord, in north greenland from 1999 to 2017 |
publishDate |
2020 |
url |
https://pure.au.dk/portal/en/publications/e973dc0f-e94f-4431-b018-c7dfa3a93826 https://doi.org/10.5194/acp-20-13253-2020 http://www.scopus.com/inward/record.url?scp=85096158602&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-16.663,-16.663,81.599,81.599) |
geographic |
Arctic Greenland Station Nord |
geographic_facet |
Arctic Greenland Station Nord |
genre |
Arctic Greenland North Greenland |
genre_facet |
Arctic Greenland North Greenland |
op_source |
Skov , H , Hjorth , J , Nordstrøm , C , Jensen , B , Christoffersen , C , Poulsen , M B , Liisberg , J B , Beddows , D , Dall'Osto , M & Christensen , J H 2020 , ' Variability in gaseous elemental mercury at Villum Research Station, Station Nord, in North Greenland from 1999 to 2017 ' , Atmospheric Chemistry and Physics , vol. 20 , no. 21 , pp. 13253-13266 . https://doi.org/10.5194/acp-20-13253-2020 |
op_relation |
https://pure.au.dk/portal/en/publications/e973dc0f-e94f-4431-b018-c7dfa3a93826 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-20-13253-2020 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
20 |
container_issue |
21 |
container_start_page |
13253 |
op_container_end_page |
13265 |
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1796306063432089600 |