Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008
Aerosol measurements at Barrow, Alaska during the past 30 years have identified the long range transport of pollution associated with Arctic Haze as well as ocean-derived aerosols of more local origin. Here, we focus on measurements of aerosol chemical composition to assess (1) trends in Arctic Haze...
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ftcopernicus:oai:publications.copernicus.org:acp1764 2023-05-15T14:51:56+02:00 Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 Quinn, P. K. Bates, T. S. Schulz, K. Shaw, G. E. 2018-01-15 application/pdf https://doi.org/10.5194/acp-9-8883-2009 https://www.atmos-chem-phys.net/9/8883/2009/ eng eng doi:10.5194/acp-9-8883-2009 https://www.atmos-chem-phys.net/9/8883/2009/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-9-8883-2009 2019-12-24T09:57:38Z Aerosol measurements at Barrow, Alaska during the past 30 years have identified the long range transport of pollution associated with Arctic Haze as well as ocean-derived aerosols of more local origin. Here, we focus on measurements of aerosol chemical composition to assess (1) trends in Arctic Haze aerosol and implications for source regions, (2) the interaction between pollution-derived and ocean-derived aerosols and the resulting impacts on the chemistry of the Arctic boundary layer, and (3) the response of aerosols to a changing climate. Aerosol chemical composition measured at Barrow, AK during the Arctic haze season is compared for the years 1976–1977 and 1997–2008. Based on these two data sets, concentrations of non-sea salt (nss) sulfate (SO 4 = ) and non-crustal (nc) vanadium (V) have decreased by about 60% over this 30 year period. Consistency in the ratios of nss SO 4 = /ncV and nc manganese (Mn)/ncV between the two data sets indicates that, although emissions have decreased in the source regions, the source regions have remained the same over this time period. The measurements from 1997–2008 indicate that, during the haze season, the nss SO 4 = aerosol at Barrow is becoming less neutralized by ammonium (NH 4 + ) yielding an increasing sea salt aerosol chloride (Cl − ) deficit. The expected consequence is an increase in the release of Cl atoms to the atmosphere and a change in the lifetime of volatile organic compounds (VOCs) including methane. In addition, summertime concentrations of biogenically-derived methanesulfonate (MSA − ) and nss SO 4 = are increasing at a rate of 12 and 8% per year, respectively. Further research is required to assess the environmental factors behind the increasing concentrations of biogenic aerosol. Text Arctic Barrow Alaska Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 9 22 8883 8888 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Aerosol measurements at Barrow, Alaska during the past 30 years have identified the long range transport of pollution associated with Arctic Haze as well as ocean-derived aerosols of more local origin. Here, we focus on measurements of aerosol chemical composition to assess (1) trends in Arctic Haze aerosol and implications for source regions, (2) the interaction between pollution-derived and ocean-derived aerosols and the resulting impacts on the chemistry of the Arctic boundary layer, and (3) the response of aerosols to a changing climate. Aerosol chemical composition measured at Barrow, AK during the Arctic haze season is compared for the years 1976–1977 and 1997–2008. Based on these two data sets, concentrations of non-sea salt (nss) sulfate (SO 4 = ) and non-crustal (nc) vanadium (V) have decreased by about 60% over this 30 year period. Consistency in the ratios of nss SO 4 = /ncV and nc manganese (Mn)/ncV between the two data sets indicates that, although emissions have decreased in the source regions, the source regions have remained the same over this time period. The measurements from 1997–2008 indicate that, during the haze season, the nss SO 4 = aerosol at Barrow is becoming less neutralized by ammonium (NH 4 + ) yielding an increasing sea salt aerosol chloride (Cl − ) deficit. The expected consequence is an increase in the release of Cl atoms to the atmosphere and a change in the lifetime of volatile organic compounds (VOCs) including methane. In addition, summertime concentrations of biogenically-derived methanesulfonate (MSA − ) and nss SO 4 = are increasing at a rate of 12 and 8% per year, respectively. Further research is required to assess the environmental factors behind the increasing concentrations of biogenic aerosol. |
format |
Text |
author |
Quinn, P. K. Bates, T. S. Schulz, K. Shaw, G. E. |
spellingShingle |
Quinn, P. K. Bates, T. S. Schulz, K. Shaw, G. E. Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 |
author_facet |
Quinn, P. K. Bates, T. S. Schulz, K. Shaw, G. E. |
author_sort |
Quinn, P. K. |
title |
Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 |
title_short |
Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 |
title_full |
Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 |
title_fullStr |
Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 |
title_full_unstemmed |
Decadal trends in aerosol chemical composition at Barrow, Alaska: 1976–2008 |
title_sort |
decadal trends in aerosol chemical composition at barrow, alaska: 1976–2008 |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-9-8883-2009 https://www.atmos-chem-phys.net/9/8883/2009/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Alaska |
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Arctic Barrow Alaska |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-9-8883-2009 https://www.atmos-chem-phys.net/9/8883/2009/ |
op_doi |
https://doi.org/10.5194/acp-9-8883-2009 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
9 |
container_issue |
22 |
container_start_page |
8883 |
op_container_end_page |
8888 |
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1766323071449300992 |