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01 October 2009
Article (Scientific journals)
Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance
Bertrand, S.; Boes, X.; Castiaux, J. et al.
2005 • In Quaternary Research, 64 (2), p. 163-175
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Keywords :
Southern Chile; last millennium; palcolimnology; Little Ice Age; sediments
Abstract :
[en] Short-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40 degrees S). This core contains a 600-yr-long undisturbed record of paleo-precipitation changes. Two measurement methods for sediment density, organic matter and biogenic silica contents are compared and the most appropriate techniques are selected. Together with aluminium and titanium concentrations, grain size and geochemical properties of the organic matter, these proxies are used to demonstrate paleo-precipitation changes around 40 degrees S. Increase of terrigenous particle supply between A.D. 1490 and A.D. 1700 suggests a humid period. Contemporaneously, delta C-13 data show increasing lake productivity, in response to the high nutrient supply. The A.D. 1700-1900 interval is characterized by a decreasing terrigenous supply and increasing delta C-13 values, interpreted as a drying period. The magnetic susceptibility signal, reflecting the terrigenous/biogenic ratio, demonstrates that similar variations occur in all the undisturbed sedimentary environments of Lago Puyehue. The A.D. 1490-1700 wet period is associated with the onset of the European Little Ice Age (LIA) and interpreted as its local signature. This work supports the fact that the LIA was a global event, not only restricted to the Northern Hemisphere. (c) 2005 University of Washington. All rights reserved.
Disciplines :
Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Bertrand, S.
Boes, X.
Castiaux, J.
Charlet, F.
Urrutia, R.
Espinoza, C.
Lepoint, Gilles  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Charlier, Bernard  ;  Université de Liège - ULiège > Département de géologie > Pétrologie et géochimie endogènes
Fagel, Nathalie ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Language :
English
Title :
Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance
Publication date :
2005
Journal title :
Quaternary Research
ISSN :
0033-5894
eISSN :
1096-0287
Publisher :
Academic Press, San Diego, United States - California
Volume :
64
Issue :
2
Pages :
163-175
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
ENSO-Chile
Funders :
SSTC - Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles

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