Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland
Lake Mývatn is an interior highland lake in northern Iceland that forms a unique ecosystem of international scientific importance and is surrounded by a landscape rich in archaeological and paleoenvironmental sites. A significant freshwater reservoir effect (FRE) has been identified in carbon from t...
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ftunivnebraskali:oai:digitalcommons.unl.edu:global-1028 2023-11-12T04:19:11+01:00 Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland Ascough, Philippa L. Cook, G. T. Church, M. J. Dunbar, E. Einarsson, Á. McGovern, Thomas H. Dugmore, A. J. Perdikaris, Sophia Hastie, H. Friðriksson, A. Gestsdóttir, H. 2010-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/global/29 https://digitalcommons.unl.edu/context/global/article/1028/viewcontent/Perdikaris_2010_RADIOCARBON_Lake_Myvatn.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/global/29 https://digitalcommons.unl.edu/context/global/article/1028/viewcontent/Perdikaris_2010_RADIOCARBON_Lake_Myvatn.pdf Global Studies Papers & Publications Anthropology Biogeochemistry Biological and Physical Anthropology Environmental Chemistry Geography International and Area Studies Radiochemistry text 2010 ftunivnebraskali 2023-10-30T12:05:43Z Lake Mývatn is an interior highland lake in northern Iceland that forms a unique ecosystem of international scientific importance and is surrounded by a landscape rich in archaeological and paleoenvironmental sites. A significant freshwater reservoir effect (FRE) has been identified in carbon from the lake at some Viking (about AD 870–1000) archaeological sites in the wider region (Mývatnssveit). Previous accelerator mass spectrometry (AMS) measurements indicated this FRE was about 1500–1900 14C yr. Here, we present the results of a study using stable isotope and 14C measurements to quantify the Mývatn FRE for both the Viking and modern periods. This work has identified a temporally variable FRE that is greatly in excess of previous assessments. New, paired samples of contemporaneous bone from terrestrial herbivores and omnivores (including humans) from Viking sites demonstrate at least some omnivore diets incorporated sufficient freshwater resources to result in a herbivore-omnivore age offset of up to 400 14C yr. Modern samples of benthic detritus, aquatic plants, zooplankton, invertebrates, and freshwater fish indicate an FRE in excess of 5000 14C yr in some species. Likely geothermal mechanisms for this large FRE are discussed, along with implications for both chronological reconstruction and integrated investigation of stable and radioactive isotopes. Text Iceland Mývatn University of Nebraska-Lincoln: DigitalCommons@UNL Mývatn ENVELOPE(-16.985,-16.985,65.600,65.600) |
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Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Anthropology Biogeochemistry Biological and Physical Anthropology Environmental Chemistry Geography International and Area Studies Radiochemistry |
spellingShingle |
Anthropology Biogeochemistry Biological and Physical Anthropology Environmental Chemistry Geography International and Area Studies Radiochemistry Ascough, Philippa L. Cook, G. T. Church, M. J. Dunbar, E. Einarsson, Á. McGovern, Thomas H. Dugmore, A. J. Perdikaris, Sophia Hastie, H. Friðriksson, A. Gestsdóttir, H. Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland |
topic_facet |
Anthropology Biogeochemistry Biological and Physical Anthropology Environmental Chemistry Geography International and Area Studies Radiochemistry |
description |
Lake Mývatn is an interior highland lake in northern Iceland that forms a unique ecosystem of international scientific importance and is surrounded by a landscape rich in archaeological and paleoenvironmental sites. A significant freshwater reservoir effect (FRE) has been identified in carbon from the lake at some Viking (about AD 870–1000) archaeological sites in the wider region (Mývatnssveit). Previous accelerator mass spectrometry (AMS) measurements indicated this FRE was about 1500–1900 14C yr. Here, we present the results of a study using stable isotope and 14C measurements to quantify the Mývatn FRE for both the Viking and modern periods. This work has identified a temporally variable FRE that is greatly in excess of previous assessments. New, paired samples of contemporaneous bone from terrestrial herbivores and omnivores (including humans) from Viking sites demonstrate at least some omnivore diets incorporated sufficient freshwater resources to result in a herbivore-omnivore age offset of up to 400 14C yr. Modern samples of benthic detritus, aquatic plants, zooplankton, invertebrates, and freshwater fish indicate an FRE in excess of 5000 14C yr in some species. Likely geothermal mechanisms for this large FRE are discussed, along with implications for both chronological reconstruction and integrated investigation of stable and radioactive isotopes. |
format |
Text |
author |
Ascough, Philippa L. Cook, G. T. Church, M. J. Dunbar, E. Einarsson, Á. McGovern, Thomas H. Dugmore, A. J. Perdikaris, Sophia Hastie, H. Friðriksson, A. Gestsdóttir, H. |
author_facet |
Ascough, Philippa L. Cook, G. T. Church, M. J. Dunbar, E. Einarsson, Á. McGovern, Thomas H. Dugmore, A. J. Perdikaris, Sophia Hastie, H. Friðriksson, A. Gestsdóttir, H. |
author_sort |
Ascough, Philippa L. |
title |
Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland |
title_short |
Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland |
title_full |
Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland |
title_fullStr |
Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland |
title_full_unstemmed |
Temporal and Spatial Variations in Freshwater 14 C Reservoir Effects: Lake Mývatn, Northern Iceland |
title_sort |
temporal and spatial variations in freshwater 14 c reservoir effects: lake mývatn, northern iceland |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2010 |
url |
https://digitalcommons.unl.edu/global/29 https://digitalcommons.unl.edu/context/global/article/1028/viewcontent/Perdikaris_2010_RADIOCARBON_Lake_Myvatn.pdf |
long_lat |
ENVELOPE(-16.985,-16.985,65.600,65.600) |
geographic |
Mývatn |
geographic_facet |
Mývatn |
genre |
Iceland Mývatn |
genre_facet |
Iceland Mývatn |
op_source |
Global Studies Papers & Publications |
op_relation |
https://digitalcommons.unl.edu/global/29 https://digitalcommons.unl.edu/context/global/article/1028/viewcontent/Perdikaris_2010_RADIOCARBON_Lake_Myvatn.pdf |
_version_ |
1782335684066934784 |