Holocene glacial history of College Fjord, south-central Alaska
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/88966 https://doi.org/10.1080/1088937X.2010.543551 |
Resumo: | Holocene glacier fluctuations in College Fjord in south-central Alaska provide an integrated proxy record of climatic and related environmental changes through this critical geologic epoch. During the early Holocene around 10,000 yr BP, ice was receding from lower Port Wells but was still present in College Fjord. With the beginning of the Holocene Climatic Optimum, recession increased and the ice front reached the Golden Moraine site 1 by 7680 cal yr BP, starting its long early to middle Holocene retreat to the head of tidewater. An ice-free fjord existed between 7680 cal yr BP and about 5190 yr BP. A middle Holocene advance started between approximately 5190 and 4470 yr BP with ice arriving at the mouth of the fjord before 2470 cal yr BP. The late Holocene was characterized by various standstills and minor readvance positions as the glacier fell back and by significant Little Ice Age expansions and retreats of individual glaciers present in the fjord. During the late Holocene, the glacier built four large and distinctive moraines all representative of at least four standstill positions of College Fjord Glacier before 2470, 2060, 1330, and approximately 1120 cal yr BP. |
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Holocene glacial history of College Fjord, south-central AlaskaHolocene glacier fluctuations in College Fjord in south-central Alaska provide an integrated proxy record of climatic and related environmental changes through this critical geologic epoch. During the early Holocene around 10,000 yr BP, ice was receding from lower Port Wells but was still present in College Fjord. With the beginning of the Holocene Climatic Optimum, recession increased and the ice front reached the Golden Moraine site 1 by 7680 cal yr BP, starting its long early to middle Holocene retreat to the head of tidewater. An ice-free fjord existed between 7680 cal yr BP and about 5190 yr BP. A middle Holocene advance started between approximately 5190 and 4470 yr BP with ice arriving at the mouth of the fjord before 2470 cal yr BP. The late Holocene was characterized by various standstills and minor readvance positions as the glacier fell back and by significant Little Ice Age expansions and retreats of individual glaciers present in the fjord. During the late Holocene, the glacier built four large and distinctive moraines all representative of at least four standstill positions of College Fjord Glacier before 2470, 2060, 1330, and approximately 1120 cal yr BP.Taylor & Francis2010-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/88966http://hdl.handle.net/10316/88966https://doi.org/10.1080/1088937X.2010.543551eng1088-937X1939-0513https://www.tandfonline.com/doi/full/10.1080/1088937X.2010.543551metadata only accessinfo:eu-repo/semantics/openAccessSantos, João António Bessa dosCunha, Lúcio José Sobral daCordova, C.E.Wiles, G.C.reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-05-25T03:34:38Zoai:estudogeral.uc.pt:10316/88966Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:09:25.570614Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Holocene glacial history of College Fjord, south-central Alaska |
title |
Holocene glacial history of College Fjord, south-central Alaska |
spellingShingle |
Holocene glacial history of College Fjord, south-central Alaska Santos, João António Bessa dos |
title_short |
Holocene glacial history of College Fjord, south-central Alaska |
title_full |
Holocene glacial history of College Fjord, south-central Alaska |
title_fullStr |
Holocene glacial history of College Fjord, south-central Alaska |
title_full_unstemmed |
Holocene glacial history of College Fjord, south-central Alaska |
title_sort |
Holocene glacial history of College Fjord, south-central Alaska |
author |
Santos, João António Bessa dos |
author_facet |
Santos, João António Bessa dos Cunha, Lúcio José Sobral da Cordova, C.E. Wiles, G.C. |
author_role |
author |
author2 |
Cunha, Lúcio José Sobral da Cordova, C.E. Wiles, G.C. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Santos, João António Bessa dos Cunha, Lúcio José Sobral da Cordova, C.E. Wiles, G.C. |
description |
Holocene glacier fluctuations in College Fjord in south-central Alaska provide an integrated proxy record of climatic and related environmental changes through this critical geologic epoch. During the early Holocene around 10,000 yr BP, ice was receding from lower Port Wells but was still present in College Fjord. With the beginning of the Holocene Climatic Optimum, recession increased and the ice front reached the Golden Moraine site 1 by 7680 cal yr BP, starting its long early to middle Holocene retreat to the head of tidewater. An ice-free fjord existed between 7680 cal yr BP and about 5190 yr BP. A middle Holocene advance started between approximately 5190 and 4470 yr BP with ice arriving at the mouth of the fjord before 2470 cal yr BP. The late Holocene was characterized by various standstills and minor readvance positions as the glacier fell back and by significant Little Ice Age expansions and retreats of individual glaciers present in the fjord. During the late Holocene, the glacier built four large and distinctive moraines all representative of at least four standstill positions of College Fjord Glacier before 2470, 2060, 1330, and approximately 1120 cal yr BP. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-12 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/88966 http://hdl.handle.net/10316/88966 https://doi.org/10.1080/1088937X.2010.543551 |
url |
http://hdl.handle.net/10316/88966 https://doi.org/10.1080/1088937X.2010.543551 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1088-937X 1939-0513 https://www.tandfonline.com/doi/full/10.1080/1088937X.2010.543551 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Taylor & Francis |
publisher.none.fl_str_mv |
Taylor & Francis |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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