English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/18381
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano)

AutorGiralt, Santiago ; Moreno Caballud, Ana ; Bao, Roberto; Sáez, Alberto; Prego, R. ; Valero-Garcés, Blas L. ; Pueyo Mur, Juan José; González-Sampériz, Penélope; Taberner, Conxita
Palabras claveChilean Altiplano
Lago Chungará
Holocene
Statistical analyses
Principal Component Analysis
Redundancy Analysis
Stratigraphically unconstrained cluster analysis
Water availability reconstruction
Fecha de publicaciónjul-2008
EditorSpringer
CitaciónJ Paleolimnol 40(1): 195–215 (2008)
ResumenA high resolution multiproxy study (magnetic susceptibility, X-ray diffraction, XRF scanner, gray-colour values, Total Organic Carbon, Total Inorganic Carbon, Total Carbon and Total Biogenic Silica) of the sedimentary infill of Lago Chungará (northern Chilean Altiplano) was undertaken to unravel the environmental forcings controlling its evolution using a number of different multivariate statistical techniques. Redundancy analyses enabled us to identify the main provenance of the studied proxies whereas stratigraphically unconstrained cluster analyses allowed us to distinguish the “outsiders” as result of anomalous XRF scanner acquisitions. Principal Component Analysis (PCA) was employed to identify and isolate the main underlying environmental gradients that characterize the sedimentary infill of Lago Chungará. The first eigenvector of the PCA could be interpreted as an indicator of changes in the input of volcaniclastic material, whereas the second one would indicate changes in water availability. The chronological model of this sedimentary sequence was constructed using 17 AMS 14C and 1 238U/230Th dates in order to characterize the volcaniclastic input and the changes in water availability in the last 12,300 cal years BP. Comparison of the reconstructed volcaniclastic input of Lago Chungará with the dust particle record from the Nevado Sajama ice core suggested that the Parinacota volcano eruptions were the main source of dust during the mid and Late Holocene rather than the dry out lakes as has previously been pointed out. The comparison of the water availability reconstruction of Lago Chungará with three of the most detailed paleoenvironmental records of the region (Paco Cocha, Lake Titicaca and Salar Uyuni) showed an heterogeneous (and sometimes contradictory) temporal and spatial pattern distribution of moisture. Although the four reconstructions showed a good correlation, each lacustrine ecosystem responded differently to the moisture oscillations that affected this region. The variations in the paleoenvironmental records could be attributed to the dating uncertainities, lake size, lake morphology, catchment size and lacustrine ecosystem responses to the abrupt arid events.
Versión del editorhttp://www.springerlink.com/content/6l72ljl21164630w/fulltext.html
URIhttp://hdl.handle.net/10261/18381
DOI10.1007/s10933-007-9151-9
ISSN0921-2728 (Print)
1573-0417 (Online)
Aparece en las colecciones: (ICTJA) Artículos
(IPE) Artículos
(IIM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Chungara 2008 JPaleol.pdf770,85 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.