Sea-salt aerosol in coastal Antarctic regions
Continuous year round records of atmospheric sea-salt concentrations have been recovered at three coastal Antarctic stations (Halley, Dumont D'Urville, and Neumayer) at temporal resolutions typically between 1 day and 2 weeks. The records were evaluated in terms of their spatial and seasonal va...
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American Geophysical Union
1998
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ftnerc:oai:nora.nerc.ac.uk:505018 2023-05-15T13:48:08+02:00 Sea-salt aerosol in coastal Antarctic regions Wagenbach, D. Ducroz, F. Mulvaney, R. Keck, L. Minikin, A. Legrand, M. Hall, J. S. Wolff, E. W. 1998 text http://nora.nerc.ac.uk/id/eprint/505018/ https://nora.nerc.ac.uk/id/eprint/505018/1/jgrd5477.pdf https://doi.org/10.1029/97JD01804 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/505018/1/jgrd5477.pdf Wagenbach, D.; Ducroz, F.; Mulvaney, R. orcid:0000-0002-5372-8148 Keck, L.; Minikin, A.; Legrand, M.; Hall, J. S.; Wolff, E. W. 1998 Sea-salt aerosol in coastal Antarctic regions. Journal of Geophysical Research, 103 (D9). 10961-10974. https://doi.org/10.1029/97JD01804 <https://doi.org/10.1029/97JD01804> Publication - Article PeerReviewed 1998 ftnerc https://doi.org/10.1029/97JD01804 2023-02-04T19:38:42Z Continuous year round records of atmospheric sea-salt concentrations have been recovered at three coastal Antarctic stations (Halley, Dumont D'Urville, and Neumayer) at temporal resolutions typically between 1 day and 2 weeks. The records were evaluated in terms of their spatial and seasonal variability as well as with respect to changes in the relative ion composition of airborn sea-salt particles. Annual mean sea-salt concentrations vary between 1400 ng m−3 at Dumont D'Urville, 850 ng m−3 at Neumayer, and 200 ng m−3 at Halley, respectively. They are thus considerably lower than the mean levels previously observed at the north tip of the Antarctic Peninsula but are, at their lower end, comparable to the level previously reported from Mawson. The representativeness of the atmospheric sea-salt data appears to be weak due to their high temporal variability, strong impacts of site specific aspects (such as site topography) but also due to the nonuniform sampling techniques applied so far. In accordance with the ice core evidence, the seasonal change in the atmospheric sea-salt load is found to be clearly out of phase with the seasonal cycle of the open water fraction offshore from the station as (with the exception of Dumont D'Urville) the lowest concentrations are generally observed during the local summer months. Major ion analyses of bulk aerosol and concurrently sampled fresh snow show a strong, systematic depletion of the SO42− to Na+ (Cl−) ratios with respect to bulk sea water, which appeared to be confined to the local winter half year. During that time, sea-salt SO42− was found to be depleted typically by 60–80% along with a concurrent Na+ deficit, which is in accordance with the precipitation of mirabilite. No significant fractionation of Mg2+, K+, and Ca2+ between seawater and sea-salt particles is observed. Laboratory experiments failed to simulate the SO42− fractionation in airborne seawater droplets or in the skin of seawater bubbles at low air temperatures. They gave, however, SO42− depletion factors, ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula ice core Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Neumayer Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) Journal of Geophysical Research: Atmospheres 103 D9 10961 10974 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Continuous year round records of atmospheric sea-salt concentrations have been recovered at three coastal Antarctic stations (Halley, Dumont D'Urville, and Neumayer) at temporal resolutions typically between 1 day and 2 weeks. The records were evaluated in terms of their spatial and seasonal variability as well as with respect to changes in the relative ion composition of airborn sea-salt particles. Annual mean sea-salt concentrations vary between 1400 ng m−3 at Dumont D'Urville, 850 ng m−3 at Neumayer, and 200 ng m−3 at Halley, respectively. They are thus considerably lower than the mean levels previously observed at the north tip of the Antarctic Peninsula but are, at their lower end, comparable to the level previously reported from Mawson. The representativeness of the atmospheric sea-salt data appears to be weak due to their high temporal variability, strong impacts of site specific aspects (such as site topography) but also due to the nonuniform sampling techniques applied so far. In accordance with the ice core evidence, the seasonal change in the atmospheric sea-salt load is found to be clearly out of phase with the seasonal cycle of the open water fraction offshore from the station as (with the exception of Dumont D'Urville) the lowest concentrations are generally observed during the local summer months. Major ion analyses of bulk aerosol and concurrently sampled fresh snow show a strong, systematic depletion of the SO42− to Na+ (Cl−) ratios with respect to bulk sea water, which appeared to be confined to the local winter half year. During that time, sea-salt SO42− was found to be depleted typically by 60–80% along with a concurrent Na+ deficit, which is in accordance with the precipitation of mirabilite. No significant fractionation of Mg2+, K+, and Ca2+ between seawater and sea-salt particles is observed. Laboratory experiments failed to simulate the SO42− fractionation in airborne seawater droplets or in the skin of seawater bubbles at low air temperatures. They gave, however, SO42− depletion factors, ... |
format |
Article in Journal/Newspaper |
author |
Wagenbach, D. Ducroz, F. Mulvaney, R. Keck, L. Minikin, A. Legrand, M. Hall, J. S. Wolff, E. W. |
spellingShingle |
Wagenbach, D. Ducroz, F. Mulvaney, R. Keck, L. Minikin, A. Legrand, M. Hall, J. S. Wolff, E. W. Sea-salt aerosol in coastal Antarctic regions |
author_facet |
Wagenbach, D. Ducroz, F. Mulvaney, R. Keck, L. Minikin, A. Legrand, M. Hall, J. S. Wolff, E. W. |
author_sort |
Wagenbach, D. |
title |
Sea-salt aerosol in coastal Antarctic regions |
title_short |
Sea-salt aerosol in coastal Antarctic regions |
title_full |
Sea-salt aerosol in coastal Antarctic regions |
title_fullStr |
Sea-salt aerosol in coastal Antarctic regions |
title_full_unstemmed |
Sea-salt aerosol in coastal Antarctic regions |
title_sort |
sea-salt aerosol in coastal antarctic regions |
publisher |
American Geophysical Union |
publishDate |
1998 |
url |
http://nora.nerc.ac.uk/id/eprint/505018/ https://nora.nerc.ac.uk/id/eprint/505018/1/jgrd5477.pdf https://doi.org/10.1029/97JD01804 |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Neumayer Dumont d'Urville Dumont-d'Urville |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Neumayer Dumont d'Urville Dumont-d'Urville |
genre |
Antarc* Antarctic Antarctic Peninsula ice core |
genre_facet |
Antarc* Antarctic Antarctic Peninsula ice core |
op_relation |
https://nora.nerc.ac.uk/id/eprint/505018/1/jgrd5477.pdf Wagenbach, D.; Ducroz, F.; Mulvaney, R. orcid:0000-0002-5372-8148 Keck, L.; Minikin, A.; Legrand, M.; Hall, J. S.; Wolff, E. W. 1998 Sea-salt aerosol in coastal Antarctic regions. Journal of Geophysical Research, 103 (D9). 10961-10974. https://doi.org/10.1029/97JD01804 <https://doi.org/10.1029/97JD01804> |
op_doi |
https://doi.org/10.1029/97JD01804 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
103 |
container_issue |
D9 |
container_start_page |
10961 |
op_container_end_page |
10974 |
_version_ |
1766248743912341504 |