Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments
Lake sediments have the potential to preserve proxy records of past climate change. Organic material suitable for radiocarbon dating often provides age control of such proxy records. Six shallow freshwater lakes on the sub-Antarctic island of South Georgia were investigated for carbon reservoir effe...
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2004
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Online Access: | http://dx.doi.org/10.1017/s0033822200035669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200035669 |
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crcambridgeupr:10.1017/s0033822200035669 2024-03-24T08:57:11+00:00 Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments Moreton, Steven G Rosqvist, Gunhild C Davies, Sarah J Bentley, Michael J 2004 http://dx.doi.org/10.1017/s0033822200035669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200035669 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Radiocarbon volume 46, issue 2, page 621-626 ISSN 0033-8222 1945-5755 General Earth and Planetary Sciences Archeology journal-article 2004 crcambridgeupr https://doi.org/10.1017/s0033822200035669 2024-02-26T15:35:18Z Lake sediments have the potential to preserve proxy records of past climate change. Organic material suitable for radiocarbon dating often provides age control of such proxy records. Six shallow freshwater lakes on the sub-Antarctic island of South Georgia were investigated for carbon reservoir effects that may influence age-depth profiles from lake sediment records in this important region. Paired samples of particulate organic matter (POM) from the water column and surface sediment (bulk organic carbon) were analyzed by accelerator mass spectrometry 14 C. POM in 4 lakes was found to be in equilibrium with the atmosphere (~107% modern), whereas 2 lakes showed significant depletion of 14 C. In each lake, the surface sediment ages were older than the paired POM age. Surface sediment ages showed a much greater range of ages compared to the equivalent POM ages, even for lakes located in close proximity. We conclude that sediment disturbance during coring, bioturbation, and periodic resuspension of sediments are likely factors causing the difference in the apparent age of surface sediments. Article in Journal/Newspaper Antarc* Antarctic Cambridge University Press Antarctic Radiocarbon 46 2 621 626 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Archeology |
spellingShingle |
General Earth and Planetary Sciences Archeology Moreton, Steven G Rosqvist, Gunhild C Davies, Sarah J Bentley, Michael J Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments |
topic_facet |
General Earth and Planetary Sciences Archeology |
description |
Lake sediments have the potential to preserve proxy records of past climate change. Organic material suitable for radiocarbon dating often provides age control of such proxy records. Six shallow freshwater lakes on the sub-Antarctic island of South Georgia were investigated for carbon reservoir effects that may influence age-depth profiles from lake sediment records in this important region. Paired samples of particulate organic matter (POM) from the water column and surface sediment (bulk organic carbon) were analyzed by accelerator mass spectrometry 14 C. POM in 4 lakes was found to be in equilibrium with the atmosphere (~107% modern), whereas 2 lakes showed significant depletion of 14 C. In each lake, the surface sediment ages were older than the paired POM age. Surface sediment ages showed a much greater range of ages compared to the equivalent POM ages, even for lakes located in close proximity. We conclude that sediment disturbance during coring, bioturbation, and periodic resuspension of sediments are likely factors causing the difference in the apparent age of surface sediments. |
format |
Article in Journal/Newspaper |
author |
Moreton, Steven G Rosqvist, Gunhild C Davies, Sarah J Bentley, Michael J |
author_facet |
Moreton, Steven G Rosqvist, Gunhild C Davies, Sarah J Bentley, Michael J |
author_sort |
Moreton, Steven G |
title |
Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments |
title_short |
Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments |
title_full |
Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments |
title_fullStr |
Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments |
title_full_unstemmed |
Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments |
title_sort |
radiocarbon reservoir ages from freshwater lakes, south georgia, sub-antarctic: modern analogues from particulate organic matter and surface sediments |
publisher |
Cambridge University Press (CUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1017/s0033822200035669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200035669 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Radiocarbon volume 46, issue 2, page 621-626 ISSN 0033-8222 1945-5755 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0033822200035669 |
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Radiocarbon |
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46 |
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2 |
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621 |
op_container_end_page |
626 |
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1794406794416619520 |