Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving
Oceanic changes before and after the relocation of iceberg B9B and calving of the Mertz Glacier Tongue (MGT) in February 2010 are examined on the continental shelf off the Adlie Land/George V Land coast, East Antarctica. Summer hydrographic observations, including stable oxygen isotope ratio (δ 18 O...
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Online Access: | https://doi.org/10.1002/2017JC012925 http://ecite.utas.edu.au/123547 |
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ftunivtasecite:oai:ecite.utas.edu.au:123547 2023-05-15T13:49:03+02:00 Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving Aoki, S Kobayashi, R Rintoul, SR Tamura, T Kusahara, K 2017 application/pdf https://doi.org/10.1002/2017JC012925 http://ecite.utas.edu.au/123547 en eng Wiley-Blackwell Publishing Inc. http://ecite.utas.edu.au/123547/1/Aoki_JGR_2017.pdf http://dx.doi.org/10.1002/2017JC012925 Aoki, S and Kobayashi, R and Rintoul, SR and Tamura, T and Kusahara, K, Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving, Journal of Geophysical Research: Oceans, 122, (8) pp. 6277-6294. ISSN 2169-9275 (2017) [Refereed Article] http://ecite.utas.edu.au/123547 Earth Sciences Atmospheric Sciences Climate Change Processes Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1002/2017JC012925 2019-12-13T22:22:15Z Oceanic changes before and after the relocation of iceberg B9B and calving of the Mertz Glacier Tongue (MGT) in February 2010 are examined on the continental shelf off the Adlie Land/George V Land coast, East Antarctica. Summer hydrographic observations, including stable oxygen isotope ratio (δ 18 O), in 2001/2008 and 2011/2015 and results of a numerical model are used. Along the western flank of the MGT, temperature decreased between 2001 and 2015 for most of the water column in the Adlie Depression. δ 18 O generally decreased, especially at the MGT draft depths on the northern side. West of the MGT, temperature, salinity, and δ 18 O decreased in the intermediate layer. East of the MGT, in contrast, temperature increased between 2001 and 2011 at intermediate depths, salinity increased in the intermediate and deep layers, and δ 18 O slightly decreased in the deep layer but did not change much around 300 dbar. The numerical experiment exhibits a change in ocean circulation, revealing an increase in modified Circumpolar Deep Water (mCDW) inflow in the east and a decrease in the west. The contrasting changes in mCDW intrusion are consistent between the observations and numerical model, and are indicative of the effect of removal of the ice barriers. The contrast is overlain by overall decreases in salinity and δ 18 O, which suggests an increase in the continental meltwater fraction of 520% and might reveal a wide-ranging influence from West Antarctica. The oxygen isotope ratio is, hence, effective in monitoring the increase in continental melt over the Antarctic shelf. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica George V Land Iceberg* Mertz Glacier West Antarctica eCite UTAS (University of Tasmania) Antarctic The Antarctic East Antarctica West Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) George V Land ENVELOPE(148.000,148.000,-68.500,-68.500) Mertz Glacier Tongue ENVELOPE(145.500,145.500,-67.167,-67.167) Journal of Geophysical Research: Oceans 122 8 6277 6294 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Atmospheric Sciences Climate Change Processes |
spellingShingle |
Earth Sciences Atmospheric Sciences Climate Change Processes Aoki, S Kobayashi, R Rintoul, SR Tamura, T Kusahara, K Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving |
topic_facet |
Earth Sciences Atmospheric Sciences Climate Change Processes |
description |
Oceanic changes before and after the relocation of iceberg B9B and calving of the Mertz Glacier Tongue (MGT) in February 2010 are examined on the continental shelf off the Adlie Land/George V Land coast, East Antarctica. Summer hydrographic observations, including stable oxygen isotope ratio (δ 18 O), in 2001/2008 and 2011/2015 and results of a numerical model are used. Along the western flank of the MGT, temperature decreased between 2001 and 2015 for most of the water column in the Adlie Depression. δ 18 O generally decreased, especially at the MGT draft depths on the northern side. West of the MGT, temperature, salinity, and δ 18 O decreased in the intermediate layer. East of the MGT, in contrast, temperature increased between 2001 and 2011 at intermediate depths, salinity increased in the intermediate and deep layers, and δ 18 O slightly decreased in the deep layer but did not change much around 300 dbar. The numerical experiment exhibits a change in ocean circulation, revealing an increase in modified Circumpolar Deep Water (mCDW) inflow in the east and a decrease in the west. The contrasting changes in mCDW intrusion are consistent between the observations and numerical model, and are indicative of the effect of removal of the ice barriers. The contrast is overlain by overall decreases in salinity and δ 18 O, which suggests an increase in the continental meltwater fraction of 520% and might reveal a wide-ranging influence from West Antarctica. The oxygen isotope ratio is, hence, effective in monitoring the increase in continental melt over the Antarctic shelf. |
format |
Article in Journal/Newspaper |
author |
Aoki, S Kobayashi, R Rintoul, SR Tamura, T Kusahara, K |
author_facet |
Aoki, S Kobayashi, R Rintoul, SR Tamura, T Kusahara, K |
author_sort |
Aoki, S |
title |
Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving |
title_short |
Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving |
title_full |
Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving |
title_fullStr |
Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving |
title_full_unstemmed |
Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving |
title_sort |
changes in water properties and flow regime on the continental shelf off the adelie/george v land coast, east antarctica, after glacier tongue calving |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2017 |
url |
https://doi.org/10.1002/2017JC012925 http://ecite.utas.edu.au/123547 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(148.000,148.000,-68.500,-68.500) ENVELOPE(145.500,145.500,-67.167,-67.167) |
geographic |
Antarctic The Antarctic East Antarctica West Antarctica Mertz Glacier George V Land Mertz Glacier Tongue |
geographic_facet |
Antarctic The Antarctic East Antarctica West Antarctica Mertz Glacier George V Land Mertz Glacier Tongue |
genre |
Antarc* Antarctic Antarctica East Antarctica George V Land Iceberg* Mertz Glacier West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica George V Land Iceberg* Mertz Glacier West Antarctica |
op_relation |
http://ecite.utas.edu.au/123547/1/Aoki_JGR_2017.pdf http://dx.doi.org/10.1002/2017JC012925 Aoki, S and Kobayashi, R and Rintoul, SR and Tamura, T and Kusahara, K, Changes in water properties and flow regime on the continental shelf off the Adelie/George V Land coast, East Antarctica, after glacier tongue calving, Journal of Geophysical Research: Oceans, 122, (8) pp. 6277-6294. ISSN 2169-9275 (2017) [Refereed Article] http://ecite.utas.edu.au/123547 |
op_doi |
https://doi.org/10.1002/2017JC012925 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
8 |
container_start_page |
6277 |
op_container_end_page |
6294 |
_version_ |
1766250742252830720 |