Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate
A series of ice cores from sites with different snow-accumulation rates across Law Dome, East Antarctica, was investigated for methanesulphonic acid (MSA) movement. The precipitation at these sites (up to 35 km apart) is influenced by the same air masses, the principal difference being the accumulat...
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ftunivtasecite:oai:ecite.utas.edu.au:26112 2023-05-15T13:29:45+02:00 Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate Curran, MAJ Palmer, AS van Ommen, TD Morgan, VI Phillips, K McMorrow, AJ Mayewski, PA 2002 https://doi.org/10.3189/172756402781816528 http://ecite.utas.edu.au/26112 en eng International Glaciological Society http://dx.doi.org/10.3189/172756402781816528 Curran, MAJ and Palmer, AS and van Ommen, TD and Morgan, VI and Phillips, K and McMorrow, AJ and Mayewski, PA, Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate, Annals of Glaciology, 35 pp. 333-339. ISSN 0260-3055 (2002) [Refereed Article] http://ecite.utas.edu.au/26112 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2002 ftunivtasecite https://doi.org/10.3189/172756402781816528 2019-12-13T21:07:04Z A series of ice cores from sites with different snow-accumulation rates across Law Dome, East Antarctica, was investigated for methanesulphonic acid (MSA) movement. The precipitation at these sites (up to 35 km apart) is influenced by the same air masses, the principal difference being the accumulation rate. At the low-accumulation-rate W20k site (0.17 m ice equivalent), MSA was completely relocated from the summer to winter layer. Moderate movement was observed at the intermediate-accumulation-rate site (0.7 m ice equivalent), Dome Summit South (DSS), while there was no evidence of movement at the high-accumulation-rate DE08 site (1.4. m ice equivalent). The main DSS record of MSA covered the epoch AD 1727-2000 and was used to investigate temporal post-depositional changes. Co-deposition of MSA and sea-salt ions was observed in the surface layers, outside of the main summer MSA peak, which complicates interpretation of these peaks as evidence of movement in deeper layers. A seasonal study of the 273 year DSS record revealed MSA migration predominantly from summer into autumn (in the up-core direction), but this migration was suppressed during the Tambora (1815) and unknown (1809) volcanic eruption period, and enhanced during an epoch (1770-1800) with high summer nitrate levels. A complex interaction between the gradients in nss-sulphate, nitrate and sea salts (which are influenced by accumulation rate) is believed to control the rate and extent of movement of MSA. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica East Antarctica eCite UTAS (University of Tasmania) East Antarctica Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Annals of Glaciology 35 333 339 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Curran, MAJ Palmer, AS van Ommen, TD Morgan, VI Phillips, K McMorrow, AJ Mayewski, PA Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
A series of ice cores from sites with different snow-accumulation rates across Law Dome, East Antarctica, was investigated for methanesulphonic acid (MSA) movement. The precipitation at these sites (up to 35 km apart) is influenced by the same air masses, the principal difference being the accumulation rate. At the low-accumulation-rate W20k site (0.17 m ice equivalent), MSA was completely relocated from the summer to winter layer. Moderate movement was observed at the intermediate-accumulation-rate site (0.7 m ice equivalent), Dome Summit South (DSS), while there was no evidence of movement at the high-accumulation-rate DE08 site (1.4. m ice equivalent). The main DSS record of MSA covered the epoch AD 1727-2000 and was used to investigate temporal post-depositional changes. Co-deposition of MSA and sea-salt ions was observed in the surface layers, outside of the main summer MSA peak, which complicates interpretation of these peaks as evidence of movement in deeper layers. A seasonal study of the 273 year DSS record revealed MSA migration predominantly from summer into autumn (in the up-core direction), but this migration was suppressed during the Tambora (1815) and unknown (1809) volcanic eruption period, and enhanced during an epoch (1770-1800) with high summer nitrate levels. A complex interaction between the gradients in nss-sulphate, nitrate and sea salts (which are influenced by accumulation rate) is believed to control the rate and extent of movement of MSA. |
format |
Article in Journal/Newspaper |
author |
Curran, MAJ Palmer, AS van Ommen, TD Morgan, VI Phillips, K McMorrow, AJ Mayewski, PA |
author_facet |
Curran, MAJ Palmer, AS van Ommen, TD Morgan, VI Phillips, K McMorrow, AJ Mayewski, PA |
author_sort |
Curran, MAJ |
title |
Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate |
title_short |
Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate |
title_full |
Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate |
title_fullStr |
Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate |
title_full_unstemmed |
Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate |
title_sort |
post-depositional movement of methanesulphonic acid at law dome, antarctica, and the influence of accumulation rate |
publisher |
International Glaciological Society |
publishDate |
2002 |
url |
https://doi.org/10.3189/172756402781816528 http://ecite.utas.edu.au/26112 |
long_lat |
ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
East Antarctica Law Dome |
geographic_facet |
East Antarctica Law Dome |
genre |
Annals of Glaciology Antarc* Antarctica East Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctica East Antarctica |
op_relation |
http://dx.doi.org/10.3189/172756402781816528 Curran, MAJ and Palmer, AS and van Ommen, TD and Morgan, VI and Phillips, K and McMorrow, AJ and Mayewski, PA, Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate, Annals of Glaciology, 35 pp. 333-339. ISSN 0260-3055 (2002) [Refereed Article] http://ecite.utas.edu.au/26112 |
op_doi |
https://doi.org/10.3189/172756402781816528 |
container_title |
Annals of Glaciology |
container_volume |
35 |
container_start_page |
333 |
op_container_end_page |
339 |
_version_ |
1766002709158166528 |