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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Main Authors: Giordano, Michael R., Kalnajs, Lars E., Goetz, J. Douglas, Avery, Anita, Katz, Erin, May, Nathaniel W., Leemon, Anna, Mattson, Claire, Pratt, Kerri, DeCarlo, Peter F.
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Language:unknown
Published: CU Scholar 2018
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Online Access:https://scholar.colorado.edu/lasp_facpapers/12
https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1013&context=lasp_facpapers
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spelling ftunicolboulder:oai:scholar.colorado.edu:lasp_facpapers-1013 2023-05-15T13:49:37+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 Katz, Erin May, Nathaniel W. Leemon, Anna Mattson, Claire Pratt, Kerri DeCarlo, Peter F. 2018-11-01T07:00:00Z application/pdf https://scholar.colorado.edu/lasp_facpapers/12 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1013&context=lasp_facpapers unknown CU Scholar https://scholar.colorado.edu/lasp_facpapers/12 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1013&context=lasp_facpapers http://creativecommons.org/licenses/by/4.0/ CC-BY Laboratory for Atmospheric & Space Physics Faculty Contributions text 2018 ftunicolboulder 2019-06-07T23:29:23Z 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 University of Colorado, Boulder: CU Scholar Antarctic Austral Ross Sea McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850)
institution Open Polar
collection University of Colorado, Boulder: CU Scholar
op_collection_id ftunicolboulder
language unknown
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
Katz, Erin
May, Nathaniel W.
Leemon, Anna
Mattson, Claire
Pratt, Kerri
DeCarlo, Peter F.
spellingShingle Giordano, Michael R.
Kalnajs, Lars E.
Goetz, J. Douglas
Avery, Anita
Katz, Erin
May, Nathaniel W.
Leemon, Anna
Mattson, Claire
Pratt, Kerri
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
Katz, Erin
May, Nathaniel W.
Leemon, Anna
Mattson, Claire
Pratt, Kerri
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
publisher CU Scholar
publishDate 2018
url https://scholar.colorado.edu/lasp_facpapers/12
https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1013&context=lasp_facpapers
long_lat ENVELOPE(166.667,166.667,-77.850,-77.850)
geographic Antarctic
Austral
Ross Sea
McMurdo Station
geographic_facet Antarctic
Austral
Ross Sea
McMurdo Station
genre Antarc*
Antarctic
Antarctica
Ross Sea
Sea ice
genre_facet Antarc*
Antarctic
Antarctica
Ross Sea
Sea ice
op_source Laboratory for Atmospheric & Space Physics Faculty Contributions
op_relation https://scholar.colorado.edu/lasp_facpapers/12
https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1013&context=lasp_facpapers
op_rights http://creativecommons.org/licenses/by/4.0/
op_rightsnorm CC-BY
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