The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed
A fundamental understanding of the processes that control Antarctic aerosols is necessary in determining the aerosol impacts on climate-relevant processes from Antarctic ice cores to clouds. The first in situ observational online composition measurements by an aerosol mass spectrometer (AMS) of Anta...
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ftcopernicus:oai:publications.copernicus.org:acp69552 2023-05-15T13:35:06+02:00 The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed Giordano, Michael R. Kalnajs, Lars E. Goetz, J. Douglas Avery, Anita M. Katz, Erin May, Nathaniel W. Leemon, Anna Mattson, Claire Pratt, Kerri A. DeCarlo, Peter F. 2018-11-30 application/pdf https://doi.org/10.5194/acp-18-16689-2018 https://www.atmos-chem-phys.net/18/16689/2018/ eng eng doi:10.5194/acp-18-16689-2018 https://www.atmos-chem-phys.net/18/16689/2018/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-18-16689-2018 2019-12-24T09:49:39Z A fundamental understanding of the processes that control Antarctic aerosols is necessary in determining the aerosol impacts on climate-relevant processes from Antarctic ice cores to clouds. The first in situ observational online composition measurements by an aerosol mass spectrometer (AMS) of Antarctic aerosols were only recently performed during the Two-Season Ozone Depletion and Interaction with Aerosols Campaign (2ODIAC). 2ODIAC was deployed to sea ice on the Ross Sea near McMurdo Station over two field seasons: austral spring–summer 2014 and winter–spring 2015. The results presented here focus on the overall trends in aerosol composition primarily as functions of air masses and local meteorological conditions. The results suggest that the impact of long-range air mass back trajectories on either the absolute or relative concentrations of the aerosol constituents measured by (and inferred from) an AMS at a coastal location is small relative to the impact of local meteorology. However, when the data are parsed by wind speed, two observations become clear. First, a critical wind speed is required to loft snow from the surface, which, in turn, increases particle counts in all measured size bins. Second, elevated wind speeds showed increased aerosol chloride and sodium. Further inspection of the AMS data shows that the increased chloride concentrations have more of a “fast-vaporizing” nature than chloride measured at low wind speed. Also presented are the Cl:Na ratios of snow samples and aerosol filter samples, as measured by ion chromatography, as well as non-chloride aerosol constituents measured by the AMS. Additionally, submicron aerosol iodine and bromine concentrations as functions of wind speed are also presented. The results presented here suggest that aerosol composition in coastal Antarctica is a strong function of wind speed and that the mechanisms determining aerosol composition are likely linked to blowing snow. Text Antarc* Antarctic Antarctica Ross Sea Sea ice Copernicus Publications: E-Journals Antarctic Austral McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) Ross Sea Atmospheric Chemistry and Physics 18 22 16689 16711 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
A fundamental understanding of the processes that control Antarctic aerosols is necessary in determining the aerosol impacts on climate-relevant processes from Antarctic ice cores to clouds. The first in situ observational online composition measurements by an aerosol mass spectrometer (AMS) of Antarctic aerosols were only recently performed during the Two-Season Ozone Depletion and Interaction with Aerosols Campaign (2ODIAC). 2ODIAC was deployed to sea ice on the Ross Sea near McMurdo Station over two field seasons: austral spring–summer 2014 and winter–spring 2015. The results presented here focus on the overall trends in aerosol composition primarily as functions of air masses and local meteorological conditions. The results suggest that the impact of long-range air mass back trajectories on either the absolute or relative concentrations of the aerosol constituents measured by (and inferred from) an AMS at a coastal location is small relative to the impact of local meteorology. However, when the data are parsed by wind speed, two observations become clear. First, a critical wind speed is required to loft snow from the surface, which, in turn, increases particle counts in all measured size bins. Second, elevated wind speeds showed increased aerosol chloride and sodium. Further inspection of the AMS data shows that the increased chloride concentrations have more of a “fast-vaporizing” nature than chloride measured at low wind speed. Also presented are the Cl:Na ratios of snow samples and aerosol filter samples, as measured by ion chromatography, as well as non-chloride aerosol constituents measured by the AMS. Additionally, submicron aerosol iodine and bromine concentrations as functions of wind speed are also presented. The results presented here suggest that aerosol composition in coastal Antarctica is a strong function of wind speed and that the mechanisms determining aerosol composition are likely linked to blowing snow. |
format |
Text |
author |
Giordano, Michael R. Kalnajs, Lars E. Goetz, J. Douglas Avery, Anita M. Katz, Erin May, Nathaniel W. Leemon, Anna Mattson, Claire Pratt, Kerri A. DeCarlo, Peter F. |
spellingShingle |
Giordano, Michael R. Kalnajs, Lars E. Goetz, J. Douglas Avery, Anita M. Katz, Erin May, Nathaniel W. Leemon, Anna Mattson, Claire Pratt, Kerri A. DeCarlo, Peter F. The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed |
author_facet |
Giordano, Michael R. Kalnajs, Lars E. Goetz, J. Douglas Avery, Anita M. Katz, Erin May, Nathaniel W. Leemon, Anna Mattson, Claire Pratt, Kerri A. DeCarlo, Peter F. |
author_sort |
Giordano, Michael R. |
title |
The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed |
title_short |
The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed |
title_full |
The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed |
title_fullStr |
The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed |
title_full_unstemmed |
The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed |
title_sort |
importance of blowing snow to halogen-containing aerosol in coastal antarctica: influence of source region versus wind speed |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-16689-2018 https://www.atmos-chem-phys.net/18/16689/2018/ |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) |
geographic |
Antarctic Austral McMurdo Station Ross Sea |
geographic_facet |
Antarctic Austral McMurdo Station Ross Sea |
genre |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Sea ice |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-18-16689-2018 https://www.atmos-chem-phys.net/18/16689/2018/ |
op_doi |
https://doi.org/10.5194/acp-18-16689-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
22 |
container_start_page |
16689 |
op_container_end_page |
16711 |
_version_ |
1766060919071178752 |