Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core
In this study, we used the stable water isotope record (δ18O) from an ice core drilled in Palmer Land, southern Antarctic Peninsula (AP). Utilizing δ18O we identified two climate regimes during the satellite era. During the 1979–1998 positive interdecadal Pacific oscillation (IPO) phase, a low-press...
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ftmdpi:oai:mdpi.com:/2076-3263/12/9/344/ 2023-08-20T04:02:13+02:00 Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core B. Daniel Emanuelsson Elizabeth R. Thomas Jack D. Humby Diana O. Vladimirova agris 2022-09-16 application/pdf https://doi.org/10.3390/geosciences12090344 EN eng Multidisciplinary Digital Publishing Institute Cryosphere https://dx.doi.org/10.3390/geosciences12090344 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 12; Issue 9; Pages: 344 ice shelf melt decadal-scale variability interdecadal Pacific oscillation (IPO) water stable isotopes ice cores Antarctic Peninsula Text 2022 ftmdpi https://doi.org/10.3390/geosciences12090344 2023-08-01T06:30:04Z In this study, we used the stable water isotope record (δ18O) from an ice core drilled in Palmer Land, southern Antarctic Peninsula (AP). Utilizing δ18O we identified two climate regimes during the satellite era. During the 1979–1998 positive interdecadal Pacific oscillation (IPO) phase, a low-pressure system north of the Weddell Sea drove southeasterly winds that are associated with an increase in warm air mass intrusion onto the Larsen shelves, which melted and a decreased sea ice concentration in the Weddell Sea/increase in the Bellingshausen Sea. This climate setting is associated with anomaly low δ18O values (compared with the latter IPO period). There is significantly more melt along the northern AP ice shelf margins and on the Larsen D and southern Larsen C during the 1979–1998 IPO positive phase. The IPO positive climatic setting was coincidental with the Larsen A ice shelf collapse. In contrast, during the IPO negative phase (1999–2011), northerly winds caused a reduction in sea ice in the Bellingshausen Sea/Drake Passage region. Moreover, a Southern Ocean north of the Weddell Sea high-pressure system caused low-latitude warm humid air over the tip and east of the AP, a setting that is associated with increased northern AP snowfall, a high δ18O anomaly, and less prone to Larsen ice shelf melt. Text Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Drake Passage ice core Ice Shelf Larsen Ice Shelf Palmer Land Sea ice Southern Ocean Weddell Sea MDPI Open Access Publishing Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Drake Passage Bellingshausen Sea Pacific Weddell Larsen Ice Shelf ENVELOPE(-62.500,-62.500,-67.500,-67.500) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) Geosciences 12 9 344 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
ice shelf melt decadal-scale variability interdecadal Pacific oscillation (IPO) water stable isotopes ice cores Antarctic Peninsula |
spellingShingle |
ice shelf melt decadal-scale variability interdecadal Pacific oscillation (IPO) water stable isotopes ice cores Antarctic Peninsula B. Daniel Emanuelsson Elizabeth R. Thomas Jack D. Humby Diana O. Vladimirova Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core |
topic_facet |
ice shelf melt decadal-scale variability interdecadal Pacific oscillation (IPO) water stable isotopes ice cores Antarctic Peninsula |
description |
In this study, we used the stable water isotope record (δ18O) from an ice core drilled in Palmer Land, southern Antarctic Peninsula (AP). Utilizing δ18O we identified two climate regimes during the satellite era. During the 1979–1998 positive interdecadal Pacific oscillation (IPO) phase, a low-pressure system north of the Weddell Sea drove southeasterly winds that are associated with an increase in warm air mass intrusion onto the Larsen shelves, which melted and a decreased sea ice concentration in the Weddell Sea/increase in the Bellingshausen Sea. This climate setting is associated with anomaly low δ18O values (compared with the latter IPO period). There is significantly more melt along the northern AP ice shelf margins and on the Larsen D and southern Larsen C during the 1979–1998 IPO positive phase. The IPO positive climatic setting was coincidental with the Larsen A ice shelf collapse. In contrast, during the IPO negative phase (1999–2011), northerly winds caused a reduction in sea ice in the Bellingshausen Sea/Drake Passage region. Moreover, a Southern Ocean north of the Weddell Sea high-pressure system caused low-latitude warm humid air over the tip and east of the AP, a setting that is associated with increased northern AP snowfall, a high δ18O anomaly, and less prone to Larsen ice shelf melt. |
format |
Text |
author |
B. Daniel Emanuelsson Elizabeth R. Thomas Jack D. Humby Diana O. Vladimirova |
author_facet |
B. Daniel Emanuelsson Elizabeth R. Thomas Jack D. Humby Diana O. Vladimirova |
author_sort |
B. Daniel Emanuelsson |
title |
Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core |
title_short |
Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core |
title_full |
Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core |
title_fullStr |
Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core |
title_full_unstemmed |
Decadal Scale Variability of Larsen Ice Shelf Melt Captured by Antarctic Peninsula Ice Core |
title_sort |
decadal scale variability of larsen ice shelf melt captured by antarctic peninsula ice core |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/geosciences12090344 |
op_coverage |
agris |
long_lat |
ENVELOPE(-62.500,-62.500,-67.500,-67.500) ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Drake Passage Bellingshausen Sea Pacific Weddell Larsen Ice Shelf Palmer Land |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Drake Passage Bellingshausen Sea Pacific Weddell Larsen Ice Shelf Palmer Land |
genre |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Drake Passage ice core Ice Shelf Larsen Ice Shelf Palmer Land Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Drake Passage ice core Ice Shelf Larsen Ice Shelf Palmer Land Sea ice Southern Ocean Weddell Sea |
op_source |
Geosciences; Volume 12; Issue 9; Pages: 344 |
op_relation |
Cryosphere https://dx.doi.org/10.3390/geosciences12090344 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences12090344 |
container_title |
Geosciences |
container_volume |
12 |
container_issue |
9 |
container_start_page |
344 |
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1774712605114368000 |