Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging
Autor(a) principal: | |
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Data de Publicação: | 2016 |
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/10451/28094 |
Resumo: | Tephrochronology uses recognizable volcanic ash layers (from airborne pyroclastic deposits, or tephras) in geological strata to set unique time references for paleoenvironmental events across wide geographic areas. This involves the detection of tephra layers which sometimes are not evident to the naked eye, including the so-called cryptotephras. Tests that are expensive, time-consuming, and/or destructive are often required. Destructive testing for tephra layers of cores from difficult regions, such as Antarctica, which are useful sources of other kinds of information beyond tephras, is always undesirable. Here we propose hyperspectral imaging of cores, Self-Organizing Map (SOM) clustering of the preprocessed spectral signatures, and spatial analysis of the classified images as a convenient, fast, non-destructive method for tephra detection. We test the method in five sediment cores from three Antarctic lakes, and show its potential for detection of tephras and cryptotephras. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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7160 |
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Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral ImagingAntarctic RegionsGeologic SedimentsLakesOptical ImagingSpectrum AnalysisVolcanic EruptionsTephrochronology uses recognizable volcanic ash layers (from airborne pyroclastic deposits, or tephras) in geological strata to set unique time references for paleoenvironmental events across wide geographic areas. This involves the detection of tephra layers which sometimes are not evident to the naked eye, including the so-called cryptotephras. Tests that are expensive, time-consuming, and/or destructive are often required. Destructive testing for tephra layers of cores from difficult regions, such as Antarctica, which are useful sources of other kinds of information beyond tephras, is always undesirable. Here we propose hyperspectral imaging of cores, Self-Organizing Map (SOM) clustering of the preprocessed spectral signatures, and spatial analysis of the classified images as a convenient, fast, non-destructive method for tephra detection. We test the method in five sediment cores from three Antarctic lakes, and show its potential for detection of tephras and cryptotephras.Repositório da Universidade de LisboaAymerich, Ismael F.Oliva, MarcGiralt, SantiagoMartín-Herrero, Julio2017-06-16T15:12:41Z20162016-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/28094engAymerich IF, Oliva M, Giralt S, Martín-Herrero J (2016) Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging. PLoS ONE 11(1): e0146578. https://doi.org/10.1371/journal.pone.014657810.1371/journal.pone.0146578info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:19:24Zoai:repositorio.ul.pt:10451/28094Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:44:20.598812Repositório 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 |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
spellingShingle |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging Aymerich, Ismael F. Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions |
title_short |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_full |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_fullStr |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_full_unstemmed |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
title_sort |
Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging |
author |
Aymerich, Ismael F. |
author_facet |
Aymerich, Ismael F. Oliva, Marc Giralt, Santiago Martín-Herrero, Julio |
author_role |
author |
author2 |
Oliva, Marc Giralt, Santiago Martín-Herrero, Julio |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Aymerich, Ismael F. Oliva, Marc Giralt, Santiago Martín-Herrero, Julio |
dc.subject.por.fl_str_mv |
Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions |
topic |
Antarctic Regions Geologic Sediments Lakes Optical Imaging Spectrum Analysis Volcanic Eruptions |
description |
Tephrochronology uses recognizable volcanic ash layers (from airborne pyroclastic deposits, or tephras) in geological strata to set unique time references for paleoenvironmental events across wide geographic areas. This involves the detection of tephra layers which sometimes are not evident to the naked eye, including the so-called cryptotephras. Tests that are expensive, time-consuming, and/or destructive are often required. Destructive testing for tephra layers of cores from difficult regions, such as Antarctica, which are useful sources of other kinds of information beyond tephras, is always undesirable. Here we propose hyperspectral imaging of cores, Self-Organizing Map (SOM) clustering of the preprocessed spectral signatures, and spatial analysis of the classified images as a convenient, fast, non-destructive method for tephra detection. We test the method in five sediment cores from three Antarctic lakes, and show its potential for detection of tephras and cryptotephras. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 2016-01-01T00:00:00Z 2017-06-16T15:12:41Z |
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/10451/28094 |
url |
http://hdl.handle.net/10451/28094 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Aymerich IF, Oliva M, Giralt S, Martín-Herrero J (2016) Detection of Tephra Layers in Antarctic Sediment Cores with Hyperspectral Imaging. PLoS ONE 11(1): e0146578. https://doi.org/10.1371/journal.pone.0146578 10.1371/journal.pone.0146578 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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 |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799134364816113664 |