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dc.contributor.authorSchneider, Tobias
dc.contributor.authorHampel , Henrietta
dc.contributor.authorMosquera Guaman, Pablo Andres
dc.contributor.authorTylmann, Wojciech
dc.contributor.authorGrosjean, Martin
dc.date.accessioned2018-10-22T19:11:18Z-
dc.date.available2018-10-22T19:11:18Z-
dc.date.issued2018
dc.identifier.issn0921-8181
dc.identifier.urihttp://dspace.ucuenca.edu.ec/handle/123456789/31453-
dc.identifier.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85048719722&origin=inward
dc.descriptionInformation about decadal to millennial variability of El Niño Southern Oscillation (ENSO) is fundamental for the assessment of ENSO responses to natural and anthropogenic forcings. Despite a growing number of ENSO reconstructions, the overall picture of Holocene ENSO variability is inconsistent. Here, we revisit the iconic Holocene ENSO sediment record of Lake Pallcacocha, Ecuador (Rodbell et al., 1999). We asked: (i) How coherent are the records of clastic layers (flood layers) in the sediments of Lake Pallcacocha and adjacent Lake Fondococha? (ii) What are the synoptic-scale atmospheric conditions that lead to intense precipitation and, potentially, to alluvial activity promoting the deposition of clastic layers in these lakes? (iii) Is intense precipitation in this area associated with El Niño, or not? We analyzed clastic layers in Late-Holocene sediments from multiple cores in Lakes Pallcacocha and Fondococha from Cajas National Park, southern Ecuadorian Andes. Additionally, we investigated precipitation data from 13 nearby meteorological stations to test if intense precipitation (percentiles P0.95, P0.99, P0.995) is predominantly related to El Niño conditions or not (based on 15 different ENSO indices). Our results show that the absolute flood frequencies (clastic layers per 100 years) differ substantially from lake to lake. This indicates that the frequency of clastic layers reflects different sensitivities (thresholds of precipitation) of the catchments to alluvial activity. 210Pb ages suggest that neither the 1982/83 nor the 1997/98 very strong El Niños produced clastic layers comparable to those found in the late Holocene. Daily precipitation records from meteorological stations close to Lake Pallcacocha including a high-altitude station from the western slope of the Andes did not show unusually high precipitation during the super El Niño 2015/16. We further find that intense precipitation in this area occurs at roughly equal probability under El Niño, La Niña and neutral conditions. Although the spectral properties of the late Holocene clastic layers in Lake Pallcacocha fall into the typical ENSO frequency band, we do not find evidence in the recent sediments and the meteorological data that would support a diagnostic link between alluvial activity in Lake Pallcacocha and strong El Niño events. Our data do not support the idea that the (late) Holocene flood record of Lake Pallcacocha is a conclusive paleo-El Niño record
dc.description.abstractInformation about decadal to millennial variability of El Niño Southern Oscillation (ENSO) is fundamental for the assessment of ENSO responses to natural and anthropogenic forcings. Despite a growing number of ENSO reconstructions, the overall picture of Holocene ENSO variability is inconsistent. Here, we revisit the iconic Holocene ENSO sediment record of Lake Pallcacocha, Ecuador (Rodbell et al., 1999). We asked: (i) How coherent are the records of clastic layers (flood layers) in the sediments of Lake Pallcacocha and adjacent Lake Fondococha? (ii) What are the synoptic-scale atmospheric conditions that lead to intense precipitation and, potentially, to alluvial activity promoting the deposition of clastic layers in these lakes? (iii) Is intense precipitation in this area associated with El Niño, or not? We analyzed clastic layers in Late-Holocene sediments from multiple cores in Lakes Pallcacocha and Fondococha from Cajas National Park, southern Ecuadorian Andes. Additionally, we investigated precipitation data from 13 nearby meteorological stations to test if intense precipitation (percentiles P0.95, P0.99, P0.995) is predominantly related to El Niño conditions or not (based on 15 different ENSO indices). Our results show that the absolute flood frequencies (clastic layers per 100 years) differ substantially from lake to lake. This indicates that the frequency of clastic layers reflects different sensitivities (thresholds of precipitation) of the catchments to alluvial activity. 210Pb ages suggest that neither the 1982/83 nor the 1997/98 very strong El Niños produced clastic layers comparable to those found in the late Holocene. Daily precipitation records from meteorological stations close to Lake Pallcacocha including a high-altitude station from the western slope of the Andes did not show unusually high precipitation during the super El Niño 2015/16. We further find that intense precipitation in this area occurs at roughly equal probability under El Niño, La Niña and neutral conditions. Although the spectral properties of the late Holocene clastic layers in Lake Pallcacocha fall into the typical ENSO frequency band, we do not find evidence in the recent sediments and the meteorological data that would support a diagnostic link between alluvial activity in Lake Pallcacocha and strong El Niño events. Our data do not support the idea that the (late) Holocene flood record of Lake Pallcacocha is a conclusive paleo-El Niño record
dc.language.isoes_ES
dc.sourceGlobal and Planetary Change
dc.subjectAndes
dc.subjectClimate Change
dc.subjectEnso
dc.subjectHolocene
dc.subjectLimnogeology
dc.subjectPaleolimnology
dc.titlePaleo-ENSO revisited: ecuadorian lake Pallcacocha does not reveal a conclusive El Niño signal
dc.typeARTÍCULO
dc.ucuenca.idautor0000-0002-1593-0273
dc.ucuenca.idautor0107313041
dc.ucuenca.idautor0107319550
dc.ucuenca.idautor0000-0003-1749-5882
dc.ucuenca.idautor0000-0002-3553-8842
dc.identifier.doi10.1016/j.gloplacha.2018.06.004
dc.ucuenca.embargoend2050-12-28
dc.ucuenca.versionVersión publicada
dc.ucuenca.embargointerno2050-12-28
dc.ucuenca.areaconocimientounescoamplio05 - CIENCIAS FISICAS, CIENCIAS NATURALES, MATEMATICAS Y ESTADISTICAS
dc.ucuenca.afiliacionSchneider, T., University of Bern, Berna, Suiza
dc.ucuenca.afiliacionHampel, H., Universidad de Cuenca, Facultad de Ciencias Químicas, Cuenca, Ecuador
dc.ucuenca.afiliacionMosquera, P., ETAPA, Cuenca , Ecuador
dc.ucuenca.afiliacionTylmann, W., Gdanski Uniwersytet Medyczny, Gdańsk, Polonia
dc.ucuenca.afiliacionGrosjean, M., University of Bern, Berna, Suiza
dc.ucuenca.volumenvolumen 168 número 0
dc.ucuenca.indicebibliograficoSCOPUS
dc.ucuenca.factorimpacto1.779
dc.ucuenca.cuartilQ1
dc.ucuenca.numerocitaciones0
dc.ucuenca.areaconocimientofrascatiamplio1. CIENCIAS NATURALES Y EXACTAS
dc.ucuenca.areaconocimientofrascatiespecifico1.5 CIENCIAS DE LA TIERRA Y EL AMBIENTE
dc.ucuenca.areaconocimientofrascatidetallado1.5.10 RECURSOS HIDRICOS
dc.ucuenca.areaconocimientounescoespecifico052 - MEDIO AMBIENTE
dc.ucuenca.areaconocimientounescodetallado0521 - CIENCIAS AMBIENTALES
dc.ucuenca.urifuentehttp://www.sciencedirect.com/science/journal/09218181
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