Climate change and mass movements in the northwest Argentine Andes

dc.creatorTrauth, Martin H.
dc.creatorAlonso, Ricardo Narciso
dc.creatorHaselton, Kirk R.
dc.creatorHermanns, Reginald L.
dc.creatorStrecker, Manfred R.
dc.date2000-06-30
dc.identifierhttp://hdl.handle.net/11336/128954
dc.identifierTrauth, Martin H.; Alonso, Ricardo Narciso; Haselton, Kirk R.; Hermanns, Reginald L.; Strecker, Manfred R.; Climate change and mass movements in the northwest Argentine Andes; Elsevier Science; Earth and Planetary Science Letters; 179; 2; 30-6-2000; 243-256
dc.identifier0012-821X
dc.identifierCONICET Digital
dc.identifierCONICET
dc.descriptionThe chronology of multiple landslide deposits and related lake sediments in the eastern Argentine Cordillera suggests that major mass movements cluster in two time periods during the Quaternary: between 35 000 and 25 000 14C yr BP and after 5000 14C yr BP. The older cluster may correspond to the Minchin wet period (40 000 and 25 000 14C yr BP) identified in tropical and subtropical South America, suggesting a causal relation between enhanced landslide activity and climate change. The younger cluster predates the Titicaca wet period that began at about 3900 14C yr BP which also affected other regions in the Andes and the Amazon Basin. No landslide and associated lake sediments are documented during the Tauca wet period (between 16 000 and 8000 14C yr BP). However, the two clusters correspond to periods where it assumed that the El Niño/Southern Oscillation (ENSO) and tropical Atlantic sea surface temperature dipole (TAD) were active. The analysis of the present-day precipitation patterns in NW Argentina indicates significant spatial and temporal differences between the intra-Andean part of the study area and the Andean foreland. Whereas the TAD seems to consistently increase rainfall, the intensity of precipitation during the El Niño phase of the ENSO is reduced to only 25% of the mean annual average in the intra-Andean basins, whereas the regions east of the Andes receive more than 125%. Similar results, but with an opposite sign, characterize La Niña events. The comparison of this pattern with paleo-precipitation data as inferred from varved lake sediments suggests that increased interannual climate variability and, therefore, increased fluctuations in rainfall and river discharge in narrow valleys may reduce landsliding thresholds.
dc.descriptionFil: Trauth, Martin H.. Universitat Potsdam; Alemania
dc.descriptionFil: Alonso, Ricardo Narciso. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina
dc.descriptionFil: Haselton, Kirk R.. Universitat Potsdam; Alemania
dc.descriptionFil: Hermanns, Reginald L.. Universitat Potsdam; Alemania
dc.descriptionFil: Strecker, Manfred R.. Universitat Potsdam; Alemania
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherElsevier Science
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0012821X00001278
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(00)00127-8
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subjectARGENTINA
dc.subjectEL NINO
dc.subjectLAKE SEDIMENTS
dc.subjectLANDSLIDES
dc.subjectPALEOCLIMATE
dc.subjectQUATERNARY
dc.subjectSOUTHERN OSCILLATION
dc.subjecthttps://purl.org/becyt/ford/1.5
dc.subjecthttps://purl.org/becyt/ford/1
dc.titleClimate change and mass movements in the northwest Argentine Andes
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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