Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica
The paper aims to reconstruct the fluctuations of Dobrowolski Glacier, a tidewater glacier located in the inner position of the Admiralty Bay (King George Island, Antarctica), from the Little Ice Age (1400-1700) until the present. Measurements of the glacier’s area and length were based on multitemp...
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União da Geomorfologia Brasileira
2023
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Online Access: | https://doi.org/10.20502/rbg.v24i3.2425 https://doaj.org/article/8c562bef1bc348a3bc77efa3be328ca7 |
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ftdoajarticles:oai:doaj.org/article:8c562bef1bc348a3bc77efa3be328ca7 2024-09-15T17:46:02+00:00 Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica Cleiva Perondi Kátia Kellem da Rosa Fabio José Guedes Magrani Carina Petsch Rosemary Vieira Arthur Ayres Neto Jefferson Cardia Simões 2023-09-01T00:00:00Z https://doi.org/10.20502/rbg.v24i3.2425 https://doaj.org/article/8c562bef1bc348a3bc77efa3be328ca7 EN ES PT eng spa por União da Geomorfologia Brasileira https://rbgeomorfologia.org.br/rbg/article/view/2425 https://doaj.org/toc/1519-1540 https://doaj.org/toc/2236-5664 doi:10.20502/rbg.v24i3.2425 1519-1540 2236-5664 https://doaj.org/article/8c562bef1bc348a3bc77efa3be328ca7 Revista Brasileira de Geomorfologia, Vol 24, Iss 3 (2023) Climate change glacial extent glacial reconstruction ice-margin Little ice age morainal banks Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.20502/rbg.v24i3.2425 2024-08-05T17:49:29Z The paper aims to reconstruct the fluctuations of Dobrowolski Glacier, a tidewater glacier located in the inner position of the Admiralty Bay (King George Island, Antarctica), from the Little Ice Age (1400-1700) until the present. Measurements of the glacier’s area and length were based on multitemporal satellite imagery and submarine glacial landforms. The glacier surface area variations between the Little Ice Age and 2014 A.D were estimated. Morainic banks and paleoglacial reconstructions provided evidence of fluctuations in the surface area of the glacier between PIG and 2014 AD. Therefore, four stages of analysis were established: Stage I (Part I) (1400 to 1700), Stage I (Part II) (1700 until the mid-20th century), Stage II (mid-20th century until the 1980s), Stage III (1980 to 2000), and Stage IV (2000 to 2020). The climate during the Little Ice Age triggered the last major glacial advance, and their grounding line position was recorded by an external and prominent morainic bank. After the major glacial advance position of the grounding line, the ice-margin has undergone higher retreat rates (stage I) as response to the warming trend and the loss of anchoring point. The stage II (Unit B) is recorded by distal and discontinuous morainal ridges and glacial lineations formed in the context of an active ice flow at a deeper point in the fjord. During stage III (Unit C) glacial lineations and steep slopes occur, while landforms are less preserved, revealing a fast shrinkage phase. Stage IV is characterized by discontinuous morainic ridges (Unit D), when the glacier presents the highest annual glacial area loss. Currently, the accelerated shrinkage may be linked to the loss of anchorage on seamounts (serving as pinning points) and increased warming. The U-shaped valley geometry has also influenced the glacier shrinkage processes and the redirection of glacial paleoflow during the last 300 years. The retreat rate to mid-20th century-2020 period is higher than Little Ice Age- mid-20th century period. Article in Journal/Newspaper Antarc* Antarctica King George Island Tidewater Directory of Open Access Journals: DOAJ Articles Revista Brasileira de Geomorfologia 24 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Spanish Portuguese |
topic |
Climate change glacial extent glacial reconstruction ice-margin Little ice age morainal banks Geology QE1-996.5 |
spellingShingle |
Climate change glacial extent glacial reconstruction ice-margin Little ice age morainal banks Geology QE1-996.5 Cleiva Perondi Kátia Kellem da Rosa Fabio José Guedes Magrani Carina Petsch Rosemary Vieira Arthur Ayres Neto Jefferson Cardia Simões Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica |
topic_facet |
Climate change glacial extent glacial reconstruction ice-margin Little ice age morainal banks Geology QE1-996.5 |
description |
The paper aims to reconstruct the fluctuations of Dobrowolski Glacier, a tidewater glacier located in the inner position of the Admiralty Bay (King George Island, Antarctica), from the Little Ice Age (1400-1700) until the present. Measurements of the glacier’s area and length were based on multitemporal satellite imagery and submarine glacial landforms. The glacier surface area variations between the Little Ice Age and 2014 A.D were estimated. Morainic banks and paleoglacial reconstructions provided evidence of fluctuations in the surface area of the glacier between PIG and 2014 AD. Therefore, four stages of analysis were established: Stage I (Part I) (1400 to 1700), Stage I (Part II) (1700 until the mid-20th century), Stage II (mid-20th century until the 1980s), Stage III (1980 to 2000), and Stage IV (2000 to 2020). The climate during the Little Ice Age triggered the last major glacial advance, and their grounding line position was recorded by an external and prominent morainic bank. After the major glacial advance position of the grounding line, the ice-margin has undergone higher retreat rates (stage I) as response to the warming trend and the loss of anchoring point. The stage II (Unit B) is recorded by distal and discontinuous morainal ridges and glacial lineations formed in the context of an active ice flow at a deeper point in the fjord. During stage III (Unit C) glacial lineations and steep slopes occur, while landforms are less preserved, revealing a fast shrinkage phase. Stage IV is characterized by discontinuous morainic ridges (Unit D), when the glacier presents the highest annual glacial area loss. Currently, the accelerated shrinkage may be linked to the loss of anchorage on seamounts (serving as pinning points) and increased warming. The U-shaped valley geometry has also influenced the glacier shrinkage processes and the redirection of glacial paleoflow during the last 300 years. The retreat rate to mid-20th century-2020 period is higher than Little Ice Age- mid-20th century period. |
format |
Article in Journal/Newspaper |
author |
Cleiva Perondi Kátia Kellem da Rosa Fabio José Guedes Magrani Carina Petsch Rosemary Vieira Arthur Ayres Neto Jefferson Cardia Simões |
author_facet |
Cleiva Perondi Kátia Kellem da Rosa Fabio José Guedes Magrani Carina Petsch Rosemary Vieira Arthur Ayres Neto Jefferson Cardia Simões |
author_sort |
Cleiva Perondi |
title |
Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica |
title_short |
Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica |
title_full |
Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica |
title_fullStr |
Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica |
title_full_unstemmed |
Paleoglaciological reconstruction and geomorphological mapping of Dobrowolski Glacier, King George Island, Antarctica |
title_sort |
paleoglaciological reconstruction and geomorphological mapping of dobrowolski glacier, king george island, antarctica |
publisher |
União da Geomorfologia Brasileira |
publishDate |
2023 |
url |
https://doi.org/10.20502/rbg.v24i3.2425 https://doaj.org/article/8c562bef1bc348a3bc77efa3be328ca7 |
genre |
Antarc* Antarctica King George Island Tidewater |
genre_facet |
Antarc* Antarctica King George Island Tidewater |
op_source |
Revista Brasileira de Geomorfologia, Vol 24, Iss 3 (2023) |
op_relation |
https://rbgeomorfologia.org.br/rbg/article/view/2425 https://doaj.org/toc/1519-1540 https://doaj.org/toc/2236-5664 doi:10.20502/rbg.v24i3.2425 1519-1540 2236-5664 https://doaj.org/article/8c562bef1bc348a3bc77efa3be328ca7 |
op_doi |
https://doi.org/10.20502/rbg.v24i3.2425 |
container_title |
Revista Brasileira de Geomorfologia |
container_volume |
24 |
container_issue |
3 |
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1810493992863793152 |