ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).

The Late Glacial-Holocene transition from the Lago Chungará sedimentary record in northern Chilean Altiplano (18ºS) is made up of laminated sediments composed of light and dark pluriannual couplets of diatomaceous ooze. Light sediment laminae accumulated during shortterm extraordinary diatom blooms...

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Autores: Hernández Hernández, Armand, Giralt Romeu, Santiago, Bao Casal, Roberto, Sáez, Alberto, Leng, Melanie J., Barker, Philip A.
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2010
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/101824
Acesso em linha:https://hdl.handle.net/2445/101824
Access Level:acceso abierto
Palavra-chave:Sedimentologia
Paleoclimatologia
Llacs
Andes
Holocè
Sedimentology
Paleoclimatology
Lakes
Holocene
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spelling ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).Hernández Hernández, ArmandGiralt Romeu, SantiagoBao Casal, RobertoSáez, AlbertoLeng, Melanie J.Barker, Philip A.SedimentologiaPaleoclimatologiaLlacsAndesHolocèSedimentologyPaleoclimatologyLakesAndesHoloceneThe Late Glacial-Holocene transition from the Lago Chungará sedimentary record in northern Chilean Altiplano (18ºS) is made up of laminated sediments composed of light and dark pluriannual couplets of diatomaceous ooze. Light sediment laminae accumulated during shortterm extraordinary diatom blooms whereas dark sediment laminae represent the baseline limnological conditions during several years of deposition. Diatom oxygen isotope data (δ18Odiatom) analyzed in 40 succesive (lamina by lamina) dark laminae, from 11,990 to 11,450 cal years BP, suggest that there occurred a series of decadal-to-centennial dry-wet oscillations. Dry periods are marked by relatively high isotope values whereas wet episodes are indicated by lower values. This interpretation agrees with the reconstructions on allochthonous inputs and regional effective moisture availability carried out in the lake. The δ18Odiatom record documents repeated effective moisture changes at a centennial-scale. Three major cycles have been established (11,990 to 11,800, 11,800 to 11,550 and 11,550 to 11,450 cal years BP). Each cycle is defined by an increasing isotope trend followed by a sudden depletion of the isotope values. In addition, several wet and dry events at a decadal scale are superimposed onto these major cycles. The spectral analyses of the δ18Odiatom values suggest that cycles and events could be triggered by both the El Niño-Southern Oscillation (ENSO) and the solar activity. Significant ENSO frequencies of 7-9 years and 15-17 years, and periodicities of the solar activity cycles such as 11 yr (Schwabe), 23 yr (Hale) and 35 yr (Brückner) have been recognized in the oxygen isotope time series. Time-frequency analysis shows that the activity of these two forces,, although was also present in the onset of the Holocene, it was more intense during the Late Glacial period. The early Holocene could be mainly governed by La Niña-like conditions that correspond to wet conditions over the Andean Altiplano.Springer Verlag2016201620102016info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion33 p.application/pdfhttps://hdl.handle.net/2445/101824Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: http://dx.doi.org/10.1007/s10933-010-9412-xJournal of Paleolimnology, 2010, vol. 44, p. 413-429http://dx.doi.org/10.1007/s10933-010-9412-x(c) Springer Verlag, 2010info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1018242026-05-29T05:05:01Z
dc.title.none.fl_str_mv ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
title ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
spellingShingle ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
Hernández Hernández, Armand
Sedimentologia
Paleoclimatologia
Llacs
Andes
Holocè
Sedimentology
Paleoclimatology
Lakes
Andes
Holocene
title_short ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
title_full ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
title_fullStr ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
title_full_unstemmed ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
title_sort ENSO and solar activity signals from oxygen isotopes in diatom silica during Lateglacial-Holocene transition in Central Andes (18ºS).
dc.creator.none.fl_str_mv Hernández Hernández, Armand
Giralt Romeu, Santiago
Bao Casal, Roberto
Sáez, Alberto
Leng, Melanie J.
Barker, Philip A.
author Hernández Hernández, Armand
author_facet Hernández Hernández, Armand
Giralt Romeu, Santiago
Bao Casal, Roberto
Sáez, Alberto
Leng, Melanie J.
Barker, Philip A.
author_role author
author2 Giralt Romeu, Santiago
Bao Casal, Roberto
Sáez, Alberto
Leng, Melanie J.
Barker, Philip A.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Sedimentologia
Paleoclimatologia
Llacs
Andes
Holocè
Sedimentology
Paleoclimatology
Lakes
Andes
Holocene
topic Sedimentologia
Paleoclimatologia
Llacs
Andes
Holocè
Sedimentology
Paleoclimatology
Lakes
Andes
Holocene
description The Late Glacial-Holocene transition from the Lago Chungará sedimentary record in northern Chilean Altiplano (18ºS) is made up of laminated sediments composed of light and dark pluriannual couplets of diatomaceous ooze. Light sediment laminae accumulated during shortterm extraordinary diatom blooms whereas dark sediment laminae represent the baseline limnological conditions during several years of deposition. Diatom oxygen isotope data (δ18Odiatom) analyzed in 40 succesive (lamina by lamina) dark laminae, from 11,990 to 11,450 cal years BP, suggest that there occurred a series of decadal-to-centennial dry-wet oscillations. Dry periods are marked by relatively high isotope values whereas wet episodes are indicated by lower values. This interpretation agrees with the reconstructions on allochthonous inputs and regional effective moisture availability carried out in the lake. The δ18Odiatom record documents repeated effective moisture changes at a centennial-scale. Three major cycles have been established (11,990 to 11,800, 11,800 to 11,550 and 11,550 to 11,450 cal years BP). Each cycle is defined by an increasing isotope trend followed by a sudden depletion of the isotope values. In addition, several wet and dry events at a decadal scale are superimposed onto these major cycles. The spectral analyses of the δ18Odiatom values suggest that cycles and events could be triggered by both the El Niño-Southern Oscillation (ENSO) and the solar activity. Significant ENSO frequencies of 7-9 years and 15-17 years, and periodicities of the solar activity cycles such as 11 yr (Schwabe), 23 yr (Hale) and 35 yr (Brückner) have been recognized in the oxygen isotope time series. Time-frequency analysis shows that the activity of these two forces,, although was also present in the onset of the Holocene, it was more intense during the Late Glacial period. The early Holocene could be mainly governed by La Niña-like conditions that correspond to wet conditions over the Andean Altiplano.
publishDate 2010
dc.date.none.fl_str_mv 2010
2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/101824
url https://hdl.handle.net/2445/101824
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: http://dx.doi.org/10.1007/s10933-010-9412-x
Journal of Paleolimnology, 2010, vol. 44, p. 413-429
http://dx.doi.org/10.1007/s10933-010-9412-x
dc.rights.none.fl_str_mv (c) Springer Verlag, 2010
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Springer Verlag, 2010
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 33 p.
application/pdf
dc.publisher.none.fl_str_mv Springer Verlag
publisher.none.fl_str_mv Springer Verlag
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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