Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine
Reconstruction of past changes in Arctic sea ice extent may be critical for understanding its future evolution. Methanesulfonate (MSA) and bromine concentrations preserved in ice cores have both been proposed as indicators of past sea ice conditions. In this study, two ice cores from central and nor...
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Copernicus Publications
2017
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fttriple:oai:gotriple.eu:oai:doaj.org/article:860d42fe40d54ab9b23c6c81b463fdec 2023-05-15T15:06:56+02:00 Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine O. J. Maselli N. J. Chellman M. Grieman L. Layman J. R. McConnell D. Pasteris R. H. Rhodes E. Saltzman M. Sigl 2017-01-01 https://doi.org/10.5194/cp-13-39-2017 http://www.clim-past.net/13/39/2017/cp-13-39-2017.pdf https://doaj.org/article/860d42fe40d54ab9b23c6c81b463fdec en eng Copernicus Publications 1814-9324 1814-9332 doi:10.5194/cp-13-39-2017 http://www.clim-past.net/13/39/2017/cp-13-39-2017.pdf https://doaj.org/article/860d42fe40d54ab9b23c6c81b463fdec undefined Climate of the Past, Vol 13, Iss 1, Pp 39-59 (2017) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/cp-13-39-2017 2023-01-22T19:29:36Z Reconstruction of past changes in Arctic sea ice extent may be critical for understanding its future evolution. Methanesulfonate (MSA) and bromine concentrations preserved in ice cores have both been proposed as indicators of past sea ice conditions. In this study, two ice cores from central and north-eastern Greenland were analysed at sub-annual resolution for MSA (CH3SO3H) and bromine, covering the time period 1750–2010. We examine correlations between ice core MSA and the HadISST1 ICE sea ice dataset and consult back trajectories to infer the likely source regions. A strong correlation between the low-frequency MSA and bromine records during pre-industrial times indicates that both chemical species are likely linked to processes occurring on or near sea ice in the same source regions. The positive correlation between ice core MSA and bromine persists until the mid-20th century, when the acidity of Greenland ice begins to increase markedly due to increased fossil fuel emissions. After that time, MSA levels decrease as a result of declining sea ice extent but bromine levels increase. We consider several possible explanations and ultimately suggest that increased acidity, specifically nitric acid, of snow on sea ice stimulates the release of reactive Br from sea ice, resulting in increased transport and deposition on the Greenland ice sheet. Article in Journal/Newspaper Arctic Greenland Greenland ice core ice core Ice Sheet Sea ice Unknown Arctic Greenland Climate of the Past 13 1 39 59 |
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envir geo O. J. Maselli N. J. Chellman M. Grieman L. Layman J. R. McConnell D. Pasteris R. H. Rhodes E. Saltzman M. Sigl Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine |
topic_facet |
envir geo |
description |
Reconstruction of past changes in Arctic sea ice extent may be critical for understanding its future evolution. Methanesulfonate (MSA) and bromine concentrations preserved in ice cores have both been proposed as indicators of past sea ice conditions. In this study, two ice cores from central and north-eastern Greenland were analysed at sub-annual resolution for MSA (CH3SO3H) and bromine, covering the time period 1750–2010. We examine correlations between ice core MSA and the HadISST1 ICE sea ice dataset and consult back trajectories to infer the likely source regions. A strong correlation between the low-frequency MSA and bromine records during pre-industrial times indicates that both chemical species are likely linked to processes occurring on or near sea ice in the same source regions. The positive correlation between ice core MSA and bromine persists until the mid-20th century, when the acidity of Greenland ice begins to increase markedly due to increased fossil fuel emissions. After that time, MSA levels decrease as a result of declining sea ice extent but bromine levels increase. We consider several possible explanations and ultimately suggest that increased acidity, specifically nitric acid, of snow on sea ice stimulates the release of reactive Br from sea ice, resulting in increased transport and deposition on the Greenland ice sheet. |
format |
Article in Journal/Newspaper |
author |
O. J. Maselli N. J. Chellman M. Grieman L. Layman J. R. McConnell D. Pasteris R. H. Rhodes E. Saltzman M. Sigl |
author_facet |
O. J. Maselli N. J. Chellman M. Grieman L. Layman J. R. McConnell D. Pasteris R. H. Rhodes E. Saltzman M. Sigl |
author_sort |
O. J. Maselli |
title |
Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine |
title_short |
Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine |
title_full |
Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine |
title_fullStr |
Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine |
title_full_unstemmed |
Sea ice and pollution-modulated changes in Greenland ice core methanesulfonate and bromine |
title_sort |
sea ice and pollution-modulated changes in greenland ice core methanesulfonate and bromine |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-39-2017 http://www.clim-past.net/13/39/2017/cp-13-39-2017.pdf https://doaj.org/article/860d42fe40d54ab9b23c6c81b463fdec |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland ice core ice core Ice Sheet Sea ice |
genre_facet |
Arctic Greenland Greenland ice core ice core Ice Sheet Sea ice |
op_source |
Climate of the Past, Vol 13, Iss 1, Pp 39-59 (2017) |
op_relation |
1814-9324 1814-9332 doi:10.5194/cp-13-39-2017 http://www.clim-past.net/13/39/2017/cp-13-39-2017.pdf https://doaj.org/article/860d42fe40d54ab9b23c6c81b463fdec |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-13-39-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
59 |
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1766338524889481216 |