Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene

Diatom-based carbon and oxygen isotope analyses (δ13Cdiatom and δ18Odiatom) were performed on diatomrich laminated sediments of Lake Chungará (Andean Altiplano, northern Chile) deposited during the Lateglacial and Early Holocene (12,400e8300 cal years BP) to reconstruct climate change and environmen...

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Autores: Hernández, Armand, Bao, Roberto, Giralt, Santiago, Sáez, Alberto, Leng, Melanie J., Barker, Philip A., Kendrick, C.P., Sloane, Hilary J.
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::b971d6be44d91361c7166623831b40c9
Acceso en línea:http://hdl.handle.net/10261/85688
Access Level:acceso abierto
Palabra clave:Carbon isotopes
Oxygen isotopes
Diatoms
Lake productivity
Andean Altiplano
Palaeoclimate
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spelling Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early HoloceneHernández, ArmandBao, RobertoGiralt, SantiagoSáez, AlbertoLeng, Melanie J.Barker, Philip A.Kendrick, C.P.Sloane, Hilary J.Carbon isotopesOxygen isotopesDiatomsLake productivityAndean AltiplanoPalaeoclimateDiatom-based carbon and oxygen isotope analyses (δ13Cdiatom and δ18Odiatom) were performed on diatomrich laminated sediments of Lake Chungará (Andean Altiplano, northern Chile) deposited during the Lateglacial and Early Holocene (12,400e8300 cal years BP) to reconstruct climate change and environmental response across this major climate transition. The δ13Cdiatom data show both centennial-tomillennial scale changes related to fluctuations in lake productivity and CO2 concentration in the lake water, and variations in carbon sources to the lake through time. The δ18Odiatom data reflect changes in lake hydrology and climate. The combination of δ13Cdiatom and δ18Odiatom data reveals interactions between the internal lake processes and its catchment runoff. During wet periods (low δ18Odiatom values) δ13Cdiatom indicates an enhanced contribution of allochthonous carbon, whereas during dry periods (high δ18Odiatom) δ13Cdiatom values suggest more autochthonous carbon production and recycling. These decadal-to-centennial oscillations are not recognized after 10,000 cal years BP, possibly as a result of ENSO-like phenomenon weakening. Humid conditions during the LateglacialeEarly Holocene transition (12,400e10,100 cal years BP) were possibly due to the establishment of La Niña-like conditions in the tropical South Pacific. Whereas, dry conditions in the Early Holocene (10,100e9100 cal years BP) may be caused by the northward migration of the ITCZ due to both ENSO-like weakening and an insolation minimum. Finally, a return to humid conditions at the end of the Early Holocene (9100e8300 cal years BP) is coincident with an increase in summer insolation. © 2012 Elsevier Ltd.The Spanish Ministry of Science and Innovation funded the research at Lake Chungará through the projects ANDESTER (BTE2001-3225), Complementary Action (BTE2001-5257-E), LAVOLTER (CGL2004-00683/BTE), GEOBILA (CGL2007-60932/BTE), PALEONAO (CGL2010-15767) and CONSOLIDER-Ingenio 2010 GRACCIE (CSD2007-00067). Armand Hernández is supported by a BPD fellowship (SFRH/BPD/79923/2011) from Portuguese Foundation for Science and Technology (FCT).Peer ReviewedPergamon Press2013201320132013info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/85688reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.quascirev.2012.10.013info:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::b971d6be44d91361c7166623831b40c92026-05-22T06:33:51Z
dc.title.none.fl_str_mv Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
title Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
spellingShingle Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
Hernández, Armand
Carbon isotopes
Oxygen isotopes
Diatoms
Lake productivity
Andean Altiplano
Palaeoclimate
title_short Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
title_full Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
title_fullStr Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
title_full_unstemmed Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
title_sort Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
dc.creator.none.fl_str_mv Hernández, Armand
Bao, Roberto
Giralt, Santiago
Sáez, Alberto
Leng, Melanie J.
Barker, Philip A.
Kendrick, C.P.
Sloane, Hilary J.
author Hernández, Armand
author_facet Hernández, Armand
Bao, Roberto
Giralt, Santiago
Sáez, Alberto
Leng, Melanie J.
Barker, Philip A.
Kendrick, C.P.
Sloane, Hilary J.
author_role author
author2 Bao, Roberto
Giralt, Santiago
Sáez, Alberto
Leng, Melanie J.
Barker, Philip A.
Kendrick, C.P.
Sloane, Hilary J.
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Carbon isotopes
Oxygen isotopes
Diatoms
Lake productivity
Andean Altiplano
Palaeoclimate
topic Carbon isotopes
Oxygen isotopes
Diatoms
Lake productivity
Andean Altiplano
Palaeoclimate
description Diatom-based carbon and oxygen isotope analyses (δ13Cdiatom and δ18Odiatom) were performed on diatomrich laminated sediments of Lake Chungará (Andean Altiplano, northern Chile) deposited during the Lateglacial and Early Holocene (12,400e8300 cal years BP) to reconstruct climate change and environmental response across this major climate transition. The δ13Cdiatom data show both centennial-tomillennial scale changes related to fluctuations in lake productivity and CO2 concentration in the lake water, and variations in carbon sources to the lake through time. The δ18Odiatom data reflect changes in lake hydrology and climate. The combination of δ13Cdiatom and δ18Odiatom data reveals interactions between the internal lake processes and its catchment runoff. During wet periods (low δ18Odiatom values) δ13Cdiatom indicates an enhanced contribution of allochthonous carbon, whereas during dry periods (high δ18Odiatom) δ13Cdiatom values suggest more autochthonous carbon production and recycling. These decadal-to-centennial oscillations are not recognized after 10,000 cal years BP, possibly as a result of ENSO-like phenomenon weakening. Humid conditions during the LateglacialeEarly Holocene transition (12,400e10,100 cal years BP) were possibly due to the establishment of La Niña-like conditions in the tropical South Pacific. Whereas, dry conditions in the Early Holocene (10,100e9100 cal years BP) may be caused by the northward migration of the ITCZ due to both ENSO-like weakening and an insolation minimum. Finally, a return to humid conditions at the end of the Early Holocene (9100e8300 cal years BP) is coincident with an increase in summer insolation. © 2012 Elsevier Ltd.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/85688
url http://hdl.handle.net/10261/85688
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.quascirev.2012.10.013
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Pergamon Press
publisher.none.fl_str_mv Pergamon Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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