%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Lavergne, A.
%A Daux, V.
%A Villalba, R.
%A Pierre, M.
%A Stievenard, M.
%A Vimeux, Françoise
%A Srur, A. M.
%T Are the oxygen isotopic compositions of Fitzroya cupressoides and Nothofagus pumilio cellulose promising proxies for climate reconstructions in northern Patagonia ?
%D 2016
%L fdi:010066809
%G ENG
%J Journal of Geophysical Research : Biogeosciences
%@ 2169-8953
%K north Patagonia ; cellulose ; O-18 ; Fitzroya cupressoides ; Nothofagus pumilio ; climate change
%K ARGENTINE ; CHILI ; ANDES ; PATAGONIE
%M ISI:000374345000010
%N 3
%P 767-776
%R 10.1002/2015jg003260
%U https://www.documentation.ird.fr/hor/fdi:010066809
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-10/010066809.pdf
%V 121
%W Horizon (IRD)
%X Tree ring O-18 chronologies from two native species (Fitzroya cupressoides and Nothofagus pumilio) in northern Patagonia were developed to assess their potential for paleoclimate reconstructions. The five annually resolved cellulose O-18 chronologies (two for F. cupressoides and three for N. pumilio) are located on the Andes along the steep west-to-east precipitation gradient. Over the common 60years long interval, the five site-O-18(cell) chronologies exhibit a strong common signal as indicated by the significant mean intercorrelation (r=0.61, p<0.05) and the high percentage (65%) of total variance explained by the first empirical orthogonal function. Although correlation analyses reveal that the two mean species-O-18(cell) chronologies are mainly modulated by December-May temperature, the N. pumilio chronology shows a greater sensitivity to record temperature variations (r=0.57, p<0.05). The O-18(cell) of N. pumilio contains a regional temperature signal representative of a large area in southern South America under the influence of the Southern Annular Mode. This study indicates that O-18(cell) in N. pumilio is a promising proxy to reconstruct past variations in temperature in South America south of 38 degrees S.
%$ 021 ; 082 ; 020 ; 076