The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE

The location of the Azores Archipelago in the North Atlantic makes this group of islands an excellent setting to study the long-term behavior of large oceanic and atmospheric climate dynamic patterns, such as the Atlantic Multidecadal Oscillation (AMO) and the North Atlantic Oscillation (NAO). Here,...

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Autores: Hernández Hernández, Armand, Sáez, Alberto, Bao Casal, Roberto, Raposeiro, Pedro Miguel, Trigo, Ricardo M., Doolittle, Sara, Masqué, Pere, Rull del Castillo, Valentí, Gonçalves, Vítor, Vázquez-Loureiro, David, Rubio de Inglés, María Jesús, Sánchez López, Guiomar, Giralt Romeu, Santiago
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/112202
Acceso en línea:https://hdl.handle.net/2445/112202
Access Level:acceso abierto
Palabra clave:Paleoclimatologia
Paleolimnologia
Açores
Paleoclimatology
Paleolimnology
Azores
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spelling The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CEHernández Hernández, ArmandSáez, AlbertoBao Casal, RobertoRaposeiro, Pedro MiguelTrigo, Ricardo M.Doolittle, SaraMasqué, PereRull del Castillo, ValentíGonçalves, VítorVázquez-Loureiro, DavidRubio de Inglés, María JesúsSánchez López, GuiomarGiralt Romeu, SantiagoPaleoclimatologiaPaleolimnologiaAçoresPaleoclimatologyPaleolimnologyAzoresThe location of the Azores Archipelago in the North Atlantic makes this group of islands an excellent setting to study the long-term behavior of large oceanic and atmospheric climate dynamic patterns, such as the Atlantic Multidecadal Oscillation (AMO) and the North Atlantic Oscillation (NAO). Here, we present the impacts of these patterns on Lake Empadadas (Azores Archipelago) from the Medieval Climate Anomaly (MCA) - Little Ice Age (LIA) transition to the present based on sedimentological, geochemical and biological characterizations of the sedimentary record. Multivariate analyses of a number of proxies including X-ray fluorescence (XRF), X-ray diffraction (XRD), total organic and inorganic carbon (TOC and TIC) and diatom life forms abundance reveal that the sedimentary infill evolution has been controlled by (i) fluctuations in the lake level and (ii) variations in organic matter accumulation. Both processes are governed by climate variability and modulated by anthropogenic activities associated with changes on the lake catchment. Changes in these two sedimentary processes have been used to infer five stages: (i) the MCA-LIA transition (ca. 1350-1450 AD) was characterized by a predominantly positive AMO phase, which led to intermediate lake levels and high organic matter concentration; (ii) the first half of the LIA (ca. 1450 - 1600 AD) was characterized by predominant lowstand conditions and intermediate organic matter deposition mainly related to negative AMO phases; (iii) the second half of the LIA (ca. 1600 - 1850 AD) was characterized by negative AMO and NAO phases, implying intermediate lake levels and high organic matter deposition; (iv) the Industrial era (ca. 1850 - 1980 AD) was characterized by the lowest lake level and organic matter accumulation associated with negative AMO phases; and (v) the period spanning between 1980 AD and the present reveals the highest lake levels and low organic matter deposition, being associated with very positive AMO conditions. At decadal-to-centennial scales, the influence of the AMO on Azorean climate plays a larger role than previously thought. In fact, the AMO appears to exert a stronger influence compared to the NAO, which is the main mode of climate variability at shorter time scales.Elsevier B.V.2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/112202Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.gloplacha.2017.05.007Global and Planetary Change, 2017, vol. 154, p. 61-74https://doi.org/10.1016/j.gloplacha.2017.05.007cc-by-nc-nd (c) Elsevier B.V., 2017http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1122022026-05-27T06:46:51Z
dc.title.none.fl_str_mv The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
title The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
spellingShingle The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
Hernández Hernández, Armand
Paleoclimatologia
Paleolimnologia
Açores
Paleoclimatology
Paleolimnology
Azores
title_short The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
title_full The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
title_fullStr The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
title_full_unstemmed The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
title_sort The influences of the AMO and NAO on the sedimentary infill in an Azores Archipelago lake since ca. 1350 CE
dc.creator.none.fl_str_mv Hernández Hernández, Armand
Sáez, Alberto
Bao Casal, Roberto
Raposeiro, Pedro Miguel
Trigo, Ricardo M.
Doolittle, Sara
Masqué, Pere
Rull del Castillo, Valentí
Gonçalves, Vítor
Vázquez-Loureiro, David
Rubio de Inglés, María Jesús
Sánchez López, Guiomar
Giralt Romeu, Santiago
author Hernández Hernández, Armand
author_facet Hernández Hernández, Armand
Sáez, Alberto
Bao Casal, Roberto
Raposeiro, Pedro Miguel
Trigo, Ricardo M.
Doolittle, Sara
Masqué, Pere
Rull del Castillo, Valentí
Gonçalves, Vítor
Vázquez-Loureiro, David
Rubio de Inglés, María Jesús
Sánchez López, Guiomar
Giralt Romeu, Santiago
author_role author
author2 Sáez, Alberto
Bao Casal, Roberto
Raposeiro, Pedro Miguel
Trigo, Ricardo M.
Doolittle, Sara
Masqué, Pere
Rull del Castillo, Valentí
Gonçalves, Vítor
Vázquez-Loureiro, David
Rubio de Inglés, María Jesús
Sánchez López, Guiomar
Giralt Romeu, Santiago
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Paleoclimatologia
Paleolimnologia
Açores
Paleoclimatology
Paleolimnology
Azores
topic Paleoclimatologia
Paleolimnologia
Açores
Paleoclimatology
Paleolimnology
Azores
description The location of the Azores Archipelago in the North Atlantic makes this group of islands an excellent setting to study the long-term behavior of large oceanic and atmospheric climate dynamic patterns, such as the Atlantic Multidecadal Oscillation (AMO) and the North Atlantic Oscillation (NAO). Here, we present the impacts of these patterns on Lake Empadadas (Azores Archipelago) from the Medieval Climate Anomaly (MCA) - Little Ice Age (LIA) transition to the present based on sedimentological, geochemical and biological characterizations of the sedimentary record. Multivariate analyses of a number of proxies including X-ray fluorescence (XRF), X-ray diffraction (XRD), total organic and inorganic carbon (TOC and TIC) and diatom life forms abundance reveal that the sedimentary infill evolution has been controlled by (i) fluctuations in the lake level and (ii) variations in organic matter accumulation. Both processes are governed by climate variability and modulated by anthropogenic activities associated with changes on the lake catchment. Changes in these two sedimentary processes have been used to infer five stages: (i) the MCA-LIA transition (ca. 1350-1450 AD) was characterized by a predominantly positive AMO phase, which led to intermediate lake levels and high organic matter concentration; (ii) the first half of the LIA (ca. 1450 - 1600 AD) was characterized by predominant lowstand conditions and intermediate organic matter deposition mainly related to negative AMO phases; (iii) the second half of the LIA (ca. 1600 - 1850 AD) was characterized by negative AMO and NAO phases, implying intermediate lake levels and high organic matter deposition; (iv) the Industrial era (ca. 1850 - 1980 AD) was characterized by the lowest lake level and organic matter accumulation associated with negative AMO phases; and (v) the period spanning between 1980 AD and the present reveals the highest lake levels and low organic matter deposition, being associated with very positive AMO conditions. At decadal-to-centennial scales, the influence of the AMO on Azorean climate plays a larger role than previously thought. In fact, the AMO appears to exert a stronger influence compared to the NAO, which is the main mode of climate variability at shorter time scales.
publishDate 2017
dc.date.none.fl_str_mv 2017
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/2445/112202
url https://hdl.handle.net/2445/112202
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.gloplacha.2017.05.007
Global and Planetary Change, 2017, vol. 154, p. 61-74
https://doi.org/10.1016/j.gloplacha.2017.05.007
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier B.V., 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier B.V., 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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