Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling
Abstract Despite extensive paleoenvironmental research on the postglacial history of the Kenai Peninsula, Alaska, uncertainties remain regarding the region's deglaciation, vegetation development, and past hydroclimate. To elucidate this complex environmental history, we present new proxy datase...
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Cambridge University Press (CUP)
2022
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Online Access: | http://dx.doi.org/10.1017/qua.2021.75 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589421000752 |
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crcambridgeupr:10.1017/qua.2021.75 2024-10-20T14:08:50+00:00 Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling Broadman, Ellie Kaufman, Darrell S. Anderson, R. Scott Bogle, Sonya Ford, Matthew Fortin, David Henderson, Andrew C. G. Lacey, Jack H. Leng, Melanie J. McKay, Nicholas P. Muñoz, Samuel E. 2022 http://dx.doi.org/10.1017/qua.2021.75 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589421000752 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 107, page 1-26 ISSN 0033-5894 1096-0287 journal-article 2022 crcambridgeupr https://doi.org/10.1017/qua.2021.75 2024-09-25T04:02:14Z Abstract Despite extensive paleoenvironmental research on the postglacial history of the Kenai Peninsula, Alaska, uncertainties remain regarding the region's deglaciation, vegetation development, and past hydroclimate. To elucidate this complex environmental history, we present new proxy datasets from Hidden and Kelly lakes, located in the eastern Kenai lowlands at the foot of the Kenai Mountains, including sedimentological properties (magnetic susceptibility, organic matter, grain size, and biogenic silica), pollen and macrofossils, diatom assemblages, and diatom oxygen isotopes. We use a simple hydrologic and isotope mass balance model to constrain interpretations of the diatom oxygen isotope data. Results reveal that glacier ice retreated from Hidden Lake's headwaters by ca. 13.1 cal ka BP, and that groundwater was an important component of Kelly Lake's hydrologic budget in the Early Holocene. As the forest developed and the climate became wetter in the Middle to Late Holocene, Kelly Lake reached or exceeded its modern level. In the last ca. 75 years, rising temperature caused rapid changes in biogenic silica content and diatom oxygen isotope values. Our findings demonstrate the utility of mass balance modeling to constrain interpretations of paleolimnologic oxygen isotope data, and that groundwater can exert a strong influence on lake water isotopes, potentially confounding interpretations of regional climate. Article in Journal/Newspaper glacier Alaska Cambridge University Press Quaternary Research 1 26 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Despite extensive paleoenvironmental research on the postglacial history of the Kenai Peninsula, Alaska, uncertainties remain regarding the region's deglaciation, vegetation development, and past hydroclimate. To elucidate this complex environmental history, we present new proxy datasets from Hidden and Kelly lakes, located in the eastern Kenai lowlands at the foot of the Kenai Mountains, including sedimentological properties (magnetic susceptibility, organic matter, grain size, and biogenic silica), pollen and macrofossils, diatom assemblages, and diatom oxygen isotopes. We use a simple hydrologic and isotope mass balance model to constrain interpretations of the diatom oxygen isotope data. Results reveal that glacier ice retreated from Hidden Lake's headwaters by ca. 13.1 cal ka BP, and that groundwater was an important component of Kelly Lake's hydrologic budget in the Early Holocene. As the forest developed and the climate became wetter in the Middle to Late Holocene, Kelly Lake reached or exceeded its modern level. In the last ca. 75 years, rising temperature caused rapid changes in biogenic silica content and diatom oxygen isotope values. Our findings demonstrate the utility of mass balance modeling to constrain interpretations of paleolimnologic oxygen isotope data, and that groundwater can exert a strong influence on lake water isotopes, potentially confounding interpretations of regional climate. |
format |
Article in Journal/Newspaper |
author |
Broadman, Ellie Kaufman, Darrell S. Anderson, R. Scott Bogle, Sonya Ford, Matthew Fortin, David Henderson, Andrew C. G. Lacey, Jack H. Leng, Melanie J. McKay, Nicholas P. Muñoz, Samuel E. |
spellingShingle |
Broadman, Ellie Kaufman, Darrell S. Anderson, R. Scott Bogle, Sonya Ford, Matthew Fortin, David Henderson, Andrew C. G. Lacey, Jack H. Leng, Melanie J. McKay, Nicholas P. Muñoz, Samuel E. Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling |
author_facet |
Broadman, Ellie Kaufman, Darrell S. Anderson, R. Scott Bogle, Sonya Ford, Matthew Fortin, David Henderson, Andrew C. G. Lacey, Jack H. Leng, Melanie J. McKay, Nicholas P. Muñoz, Samuel E. |
author_sort |
Broadman, Ellie |
title |
Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling |
title_short |
Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling |
title_full |
Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling |
title_fullStr |
Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling |
title_full_unstemmed |
Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling |
title_sort |
reconstructing postglacial hydrologic and environmental change in the eastern kenai peninsula lowlands using proxy data and mass balance modeling |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/qua.2021.75 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589421000752 |
genre |
glacier Alaska |
genre_facet |
glacier Alaska |
op_source |
Quaternary Research volume 107, page 1-26 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/qua.2021.75 |
container_title |
Quaternary Research |
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1 |
op_container_end_page |
26 |
_version_ |
1813448042739662848 |