Duprey N. auteur aut IRD Lazareth Claire E. auteur aut IRD Corrège T. auteur aut IRD Le Cornec Florence auteur aut IRD Maes Christophe auteur aut IRD Pujol N. auteur aut IRD Mandeng Yogo Magloire auteur aut IRD Caquineau Sandrine auteur aut IRD Derome C. S. auteur aut IRD Cabioch Guy auteur aut IRD text journalArticle eng text/pdf reformatted digital access We present early mid-Holocene records of Sr/Ca, delta O-18 and delta(18)Osw from marine archives collected in Vanuatu: two Porites sp. corals (6.7- 6.5 ka BP) and a Tridacna maxima giant clam (6.2-6.0 ka BP). Sr/Ca, delta O-18, and delta O-18(sw) were used as proxies for sea surface temperature (SST) and sea surface salinity (SSS). The fossil geochemical records were compared to modern Porites sp. and T. maxima records. Reconstructed mean SSTs from the two fossil Porites sp. and from the modern coral are similar, implying that the Western Pacific Warm Pool (WPWP)' southern edge had reached its modern location by 6.7- 6.5 ka BP. The post-glacial SST rise in the Southwest Pacific was thus completed by the early mid-Holocene. The two early mid-Holocene corals and the giant clam recorded saltier conditions than modern related to 1) a decoupling between the precipitation regime and the SPCZ due to a northerly position of this climatic feature and 2) an increase of the moisture transport to the extra-tropics, driven by a strengthened or extended Hadley cell. The longest delta O-18 coral profile displays an El Nino Southern Oscillation (ENSO) signal reduced by 20-30% compared to the period 1928-1992, in concordance with the reduced ENSO variability observed in the Pacific area during the first half of the Holocene. However, the decoupling between the SPCZ and the precipitation regime may have also contributed to the weak ENSO signal recorded in the early mid-Holocene coral delta O-18 profile. specialized 032 064 27 PA4207 2012 0883-8305 https://www.documentation.ird.fr/hor/fdi:010058162 10.1029/2012pa002350 0883-8305 [F B010058162] https://www.documentation.ird.fr/hor/fdi:010058162 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers15-09/010058162.pdf IRD - Base Horizon / Pleins textes 2013-01-09 2018-02-01 fdi:010058162 fre