Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss
George VI Ice Shelf is the largest ice shelf on the western side of the Antarctic Peninsula and its northern margin marks the southern most latitudinal limit of recent ice shelf retreat. As part of a project to reconstruct the long-term (Holocene) history of George VI Ice Shelf we studied two epishe...
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ftnerc:oai:nora.nerc.ac.uk:128 2024-06-09T07:38:08+00:00 Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss Smith, James A. Hodgson, Dominic A. Bentley, Michael J. Verleyen, Elie Leng, Melanie J. Roberts, Steven J. 2006 http://nora.nerc.ac.uk/id/eprint/128/ https://doi.org/10.1007/s10933-005-1333-8 unknown Springer Smith, James A. orcid:0000-0002-1333-2544 Hodgson, Dominic A. orcid:0000-0002-3841-3746 Bentley, Michael J.; Verleyen, Elie; Leng, Melanie J.; Roberts, Steven J. orcid:0000-0003-3407-9127 . 2006 Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss. Journal of Paleolimnology, 35 (2). 373-394. https://doi.org/10.1007/s10933-005-1333-8 <https://doi.org/10.1007/s10933-005-1333-8> Glaciology Ecology and Environment Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.1007/s10933-005-1333-8 2024-05-15T08:39:04Z George VI Ice Shelf is the largest ice shelf on the western side of the Antarctic Peninsula and its northern margin marks the southern most latitudinal limit of recent ice shelf retreat. As part of a project to reconstruct the long-term (Holocene) history of George VI Ice Shelf we studied two epishelf lakes impounded by the ice shelf at Ablation Point, on the east coast of Alexander Island. These lakes, Moutonnée and Ablation, are stratified water bodies with a lower marine layer and an upper freshwater layer. To determine if their sediment records could be used to detect past changes in the presence or absence of the ice shelf it was necessary to describe their present-day limnology and sedimentology. We measured water column chemistry and sampled the water column and sediments of the lakes along vertical and horizontal transects. We analysed these samples for diatoms, stable isotopes (δ18O, δ2H, δ13CDIC, δ13Corg), geochemistry (TOC, TN, C/N ratios) and physical sedimentology (grain-size). This was supplemented by chemical and biological reference data from the catchments. Results showed that the water columns of both lakes are nutrient limited and deficient in phytoplankton. Benthic productivity is low and decreases with depth. Comparison of water column chemistry with an earlier survey shows a net increase in the thickness of the freshwater layer in Moutonnée Lake between 1973 and 2001, which could indicate that George VI Ice Shelf has thinned during this period. However, a similar trend was not observed in Ablation Lake (5 km to the north) and an alternative explanation is that the changes are a seasonal phenomena. Data from the surface sediment transects identified a number of proxies that respond to the present day stratification of the water column including diatom species composition, stable isotopes and geochemistry, particularly in Moutonnée Lake. Collectively these data have been used to develop a conceptual model for determining past ice shelf configuration in epishelf lakes. Specifically, periods of ... Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Natural Environment Research Council: NERC Open Research Archive Ablation Lake ENVELOPE(-68.388,-68.388,-70.820,-70.820) Ablation Point ENVELOPE(-68.333,-68.333,-70.799,-70.799) Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) Moutonnée Lake ENVELOPE(-68.334,-68.334,-70.866,-70.866) The Antarctic Journal of Paleolimnology 35 2 373 394 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology Ecology and Environment |
spellingShingle |
Glaciology Ecology and Environment Smith, James A. Hodgson, Dominic A. Bentley, Michael J. Verleyen, Elie Leng, Melanie J. Roberts, Steven J. Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss |
topic_facet |
Glaciology Ecology and Environment |
description |
George VI Ice Shelf is the largest ice shelf on the western side of the Antarctic Peninsula and its northern margin marks the southern most latitudinal limit of recent ice shelf retreat. As part of a project to reconstruct the long-term (Holocene) history of George VI Ice Shelf we studied two epishelf lakes impounded by the ice shelf at Ablation Point, on the east coast of Alexander Island. These lakes, Moutonnée and Ablation, are stratified water bodies with a lower marine layer and an upper freshwater layer. To determine if their sediment records could be used to detect past changes in the presence or absence of the ice shelf it was necessary to describe their present-day limnology and sedimentology. We measured water column chemistry and sampled the water column and sediments of the lakes along vertical and horizontal transects. We analysed these samples for diatoms, stable isotopes (δ18O, δ2H, δ13CDIC, δ13Corg), geochemistry (TOC, TN, C/N ratios) and physical sedimentology (grain-size). This was supplemented by chemical and biological reference data from the catchments. Results showed that the water columns of both lakes are nutrient limited and deficient in phytoplankton. Benthic productivity is low and decreases with depth. Comparison of water column chemistry with an earlier survey shows a net increase in the thickness of the freshwater layer in Moutonnée Lake between 1973 and 2001, which could indicate that George VI Ice Shelf has thinned during this period. However, a similar trend was not observed in Ablation Lake (5 km to the north) and an alternative explanation is that the changes are a seasonal phenomena. Data from the surface sediment transects identified a number of proxies that respond to the present day stratification of the water column including diatom species composition, stable isotopes and geochemistry, particularly in Moutonnée Lake. Collectively these data have been used to develop a conceptual model for determining past ice shelf configuration in epishelf lakes. Specifically, periods of ... |
format |
Article in Journal/Newspaper |
author |
Smith, James A. Hodgson, Dominic A. Bentley, Michael J. Verleyen, Elie Leng, Melanie J. Roberts, Steven J. |
author_facet |
Smith, James A. Hodgson, Dominic A. Bentley, Michael J. Verleyen, Elie Leng, Melanie J. Roberts, Steven J. |
author_sort |
Smith, James A. |
title |
Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss |
title_short |
Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss |
title_full |
Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss |
title_fullStr |
Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss |
title_full_unstemmed |
Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss |
title_sort |
limnology of two antarctic epishelf lakes and their potential to record periods of ice shelf loss |
publisher |
Springer |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/128/ https://doi.org/10.1007/s10933-005-1333-8 |
long_lat |
ENVELOPE(-68.388,-68.388,-70.820,-70.820) ENVELOPE(-68.333,-68.333,-70.799,-70.799) ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-67.840,-67.840,-71.692,-71.692) ENVELOPE(-68.334,-68.334,-70.866,-70.866) |
geographic |
Ablation Lake Ablation Point Alexander Island Antarctic Antarctic Peninsula George VI Ice Shelf Moutonnée Lake The Antarctic |
geographic_facet |
Ablation Lake Ablation Point Alexander Island Antarctic Antarctic Peninsula George VI Ice Shelf Moutonnée Lake The Antarctic |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf |
op_relation |
Smith, James A. orcid:0000-0002-1333-2544 Hodgson, Dominic A. orcid:0000-0002-3841-3746 Bentley, Michael J.; Verleyen, Elie; Leng, Melanie J.; Roberts, Steven J. orcid:0000-0003-3407-9127 . 2006 Limnology of two Antarctic epishelf lakes and their potential to record periods of ice shelf loss. Journal of Paleolimnology, 35 (2). 373-394. https://doi.org/10.1007/s10933-005-1333-8 <https://doi.org/10.1007/s10933-005-1333-8> |
op_doi |
https://doi.org/10.1007/s10933-005-1333-8 |
container_title |
Journal of Paleolimnology |
container_volume |
35 |
container_issue |
2 |
container_start_page |
373 |
op_container_end_page |
394 |
_version_ |
1801370608551854080 |