Lavergne A. auteur aut IRD Daux V. auteur aut IRD Villalba R. auteur aut IRD Pierre M. auteur aut IRD Stievenard M. auteur aut IRD Vimeux Françoise auteur aut IRD Srur A. M. auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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. specialized north Patagonia cellulose O-18 Fitzroya cupressoides Nothofagus pumilio climate change ARGENTINE CHILI ANDES 021 082 020 076 121 3 767-776 2016 2169-8953 https://www.documentation.ird.fr/hor/fdi:010066809 10.1002/2015jg003260 2169-8953 [F B010066809] https://www.documentation.ird.fr/hor/fdi:010066809 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-10/010066809.pdf IRD - Base Horizon / Pleins textes 2016-06-02 2025-01-28 fdi:010066809 fre