A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano)
A 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...
Published in: | Journal of Paleolimnology |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2008
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/18381 https://doi.org/10.1007/s10933-007-9151-9 |
id |
ftcsic:oai:digital.csic.es:10261/18381 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/18381 2024-02-11T10:04:48+01:00 A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) Giralt, Santiago Moreno Caballud, Ana Bao, Roberto Sáez, Alberto Prego, R. Valero-Garcés, Blas L. Pueyo Mur, Juan José González-Sampériz, Penélope Taberner, Conxita 2008-07 717685 bytes application/pdf http://hdl.handle.net/10261/18381 https://doi.org/10.1007/s10933-007-9151-9 en eng Springer http://www.springerlink.com/content/6l72ljl21164630w/fulltext.html J Paleolimnol 40(1): 195–215 (2008) 0921-2728 http://hdl.handle.net/10261/18381 doi:10.1007/s10933-007-9151-9 1573-0417 open Chilean Altiplano Lago Chungará Holocene Statistical analyses Principal Component Analysis Redundancy Analysis Stratigraphically unconstrained cluster analysis Water availability reconstruction artículo http://purl.org/coar/resource_type/c_6501 2008 ftcsic https://doi.org/10.1007/s10933-007-9151-9 2024-01-16T09:24:20Z A 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 ... Article in Journal/Newspaper ice core Digital.CSIC (Spanish National Research Council) Journal of Paleolimnology 40 1 195 215 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Chilean Altiplano Lago Chungará Holocene Statistical analyses Principal Component Analysis Redundancy Analysis Stratigraphically unconstrained cluster analysis Water availability reconstruction |
spellingShingle |
Chilean Altiplano Lago Chungará Holocene Statistical analyses Principal Component Analysis Redundancy Analysis Stratigraphically unconstrained cluster analysis Water availability reconstruction Giralt, Santiago Moreno Caballud, Ana Bao, Roberto Sáez, Alberto Prego, R. Valero-Garcés, Blas L. Pueyo Mur, Juan José González-Sampériz, Penélope Taberner, Conxita A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) |
topic_facet |
Chilean Altiplano Lago Chungará Holocene Statistical analyses Principal Component Analysis Redundancy Analysis Stratigraphically unconstrained cluster analysis Water availability reconstruction |
description |
A 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 ... |
format |
Article in Journal/Newspaper |
author |
Giralt, Santiago Moreno Caballud, Ana Bao, Roberto Sáez, Alberto Prego, R. Valero-Garcés, Blas L. Pueyo Mur, Juan José González-Sampériz, Penélope Taberner, Conxita |
author_facet |
Giralt, Santiago Moreno Caballud, Ana Bao, Roberto Sáez, Alberto Prego, R. Valero-Garcés, Blas L. Pueyo Mur, Juan José González-Sampériz, Penélope Taberner, Conxita |
author_sort |
Giralt, Santiago |
title |
A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) |
title_short |
A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) |
title_full |
A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) |
title_fullStr |
A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) |
title_full_unstemmed |
A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano) |
title_sort |
statistical approach to disentangle environmental forcings in a lacustrine record: the lago chungará case (chilean altiplano) |
publisher |
Springer |
publishDate |
2008 |
url |
http://hdl.handle.net/10261/18381 https://doi.org/10.1007/s10933-007-9151-9 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
http://www.springerlink.com/content/6l72ljl21164630w/fulltext.html J Paleolimnol 40(1): 195–215 (2008) 0921-2728 http://hdl.handle.net/10261/18381 doi:10.1007/s10933-007-9151-9 1573-0417 |
op_rights |
open |
op_doi |
https://doi.org/10.1007/s10933-007-9151-9 |
container_title |
Journal of Paleolimnology |
container_volume |
40 |
container_issue |
1 |
container_start_page |
195 |
op_container_end_page |
215 |
_version_ |
1790601547456970752 |