Glacier tongue calving reduced dense water formation and enhanced carbon uptake
[1] Dense shelf water formed in the Mertz Polynya supplies the lower limb of the global overturning circulation, ventilating the abyssal Indian and Pacific Oceans. Calving of the Mertz Glacier Tongue (MGT) in February 2010 altered the regional distribution of ice and reduced the size and activity of...
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ftunivtasecite:oai:ecite.utas.edu.au:83966 2023-05-15T14:02:31+02:00 Glacier tongue calving reduced dense water formation and enhanced carbon uptake Shadwick, EH Rintoul, SR Tilbrook, BD Williams, GD Young, NW Fraser, AD Marchant, H Smith, J Tamura, T 2013 application/pdf https://doi.org/10.1002/grl.50178 http://ecite.utas.edu.au/83966 en eng Amer Geophysical Union http://ecite.utas.edu.au/83966/1/Shadwick_2012_glacier_tongue_calving.pdf http://dx.doi.org/10.1002/grl.50178 Shadwick, EH and Rintoul, SR and Tilbrook, BD and Williams, GD and Young, NW and Fraser, AD and Marchant, H and Smith, J and Tamura, T, Glacier tongue calving reduced dense water formation and enhanced carbon uptake, Geophysical Research Letters, 40, (5) pp. 904-909. ISSN 0094-8276 (2013) [Refereed Article] http://ecite.utas.edu.au/83966 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2013 ftunivtasecite https://doi.org/10.1002/grl.50178 2019-12-13T21:48:32Z [1] Dense shelf water formed in the Mertz Polynya supplies the lower limb of the global overturning circulation, ventilating the abyssal Indian and Pacific Oceans. Calving of the Mertz Glacier Tongue (MGT) in February 2010 altered the regional distribution of ice and reduced the size and activity of the polynya. The salinity and density of dense shelf water declined abruptly after calving, consistent with a reduction of sea ice formation in the polynya. Breakout and melt of thick multiyear sea ice released by the movement of iceberg B9B and the MGT freshened near-surface waters. The input of meltwater likely enhanced the availability of light and iron, supporting a diatom bloom that doubled carbon uptake relative to precalving conditions. The enhanced biological carbon drawdown increased the carbonate saturation state, outweighing dilution by meltwater input. These observations highlight the sensitivity of dense water formation, biological productivity, and carbon export to changes in the Antarctic icescape. Article in Journal/Newspaper Antarc* Antarctic Iceberg* Mertz Glacier Sea ice eCite UTAS (University of Tasmania) Antarctic Indian Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Mertz Glacier Tongue ENVELOPE(145.500,145.500,-67.167,-67.167) Pacific The Antarctic Geophysical Research Letters 40 5 904 909 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Shadwick, EH Rintoul, SR Tilbrook, BD Williams, GD Young, NW Fraser, AD Marchant, H Smith, J Tamura, T Glacier tongue calving reduced dense water formation and enhanced carbon uptake |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
[1] Dense shelf water formed in the Mertz Polynya supplies the lower limb of the global overturning circulation, ventilating the abyssal Indian and Pacific Oceans. Calving of the Mertz Glacier Tongue (MGT) in February 2010 altered the regional distribution of ice and reduced the size and activity of the polynya. The salinity and density of dense shelf water declined abruptly after calving, consistent with a reduction of sea ice formation in the polynya. Breakout and melt of thick multiyear sea ice released by the movement of iceberg B9B and the MGT freshened near-surface waters. The input of meltwater likely enhanced the availability of light and iron, supporting a diatom bloom that doubled carbon uptake relative to precalving conditions. The enhanced biological carbon drawdown increased the carbonate saturation state, outweighing dilution by meltwater input. These observations highlight the sensitivity of dense water formation, biological productivity, and carbon export to changes in the Antarctic icescape. |
format |
Article in Journal/Newspaper |
author |
Shadwick, EH Rintoul, SR Tilbrook, BD Williams, GD Young, NW Fraser, AD Marchant, H Smith, J Tamura, T |
author_facet |
Shadwick, EH Rintoul, SR Tilbrook, BD Williams, GD Young, NW Fraser, AD Marchant, H Smith, J Tamura, T |
author_sort |
Shadwick, EH |
title |
Glacier tongue calving reduced dense water formation and enhanced carbon uptake |
title_short |
Glacier tongue calving reduced dense water formation and enhanced carbon uptake |
title_full |
Glacier tongue calving reduced dense water formation and enhanced carbon uptake |
title_fullStr |
Glacier tongue calving reduced dense water formation and enhanced carbon uptake |
title_full_unstemmed |
Glacier tongue calving reduced dense water formation and enhanced carbon uptake |
title_sort |
glacier tongue calving reduced dense water formation and enhanced carbon uptake |
publisher |
Amer Geophysical Union |
publishDate |
2013 |
url |
https://doi.org/10.1002/grl.50178 http://ecite.utas.edu.au/83966 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(145.500,145.500,-67.167,-67.167) |
geographic |
Antarctic Indian Mertz Glacier Mertz Glacier Tongue Pacific The Antarctic |
geographic_facet |
Antarctic Indian Mertz Glacier Mertz Glacier Tongue Pacific The Antarctic |
genre |
Antarc* Antarctic Iceberg* Mertz Glacier Sea ice |
genre_facet |
Antarc* Antarctic Iceberg* Mertz Glacier Sea ice |
op_relation |
http://ecite.utas.edu.au/83966/1/Shadwick_2012_glacier_tongue_calving.pdf http://dx.doi.org/10.1002/grl.50178 Shadwick, EH and Rintoul, SR and Tilbrook, BD and Williams, GD and Young, NW and Fraser, AD and Marchant, H and Smith, J and Tamura, T, Glacier tongue calving reduced dense water formation and enhanced carbon uptake, Geophysical Research Letters, 40, (5) pp. 904-909. ISSN 0094-8276 (2013) [Refereed Article] http://ecite.utas.edu.au/83966 |
op_doi |
https://doi.org/10.1002/grl.50178 |
container_title |
Geophysical Research Letters |
container_volume |
40 |
container_issue |
5 |
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904 |
op_container_end_page |
909 |
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1766272823148412928 |