%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Dassié, E. P.
%A Linsley, B. K.
%A Correge, T.
%A Wu, H. C.
%A Lemley, G. M.
%A Howe, S.
%A Cabioch, Guy
%T A Fiji multi-coral delta O-18 composite approach to obtaining a more accurate reconstruction of the last two-centuries of the ocean-climate variability in the South Pacific Convergence Zone region
%D 2014
%L fdi:010063715
%G ENG
%J Paleoceanography
%@ 0883-8305
%K coral oxygen isotope ; South Pacific Convergence Zone ; coral composite ; interannual decadal and interdecadal variability
%K PACIFIQUE SUD ; FIJI ARCHIPEL
%M ISI:000348536600006
%N 12
%P 1196-1213
%R 10.1002/2013pa002591
%U https://www.documentation.ird.fr/hor/fdi:010063715
%> https://www.documentation.ird.fr/intranet/publi/2015/02/010063715.pdf
%V 29
%W Horizon (IRD)
%X The limited availability of oceanographic data in the tropical Pacific Ocean prior to the satellite era makes coral-based climate reconstructions a key tool for extending the instrumental record back in time, thereby providing a much needed test for climate models and projections. We have generated a unique regional network consisting of five Porites coral O-18 time series from different locations in the Fijian archipelago. Our results indicate that using a minimum of three Porites coral O-18 records from Fiji is statistically sufficient to obtain a reliable signal for climate reconstruction, and that application of an approach used in tree ring studies is a suitable tool to determine this number. The coral O-18 composite indicates that while sea surface temperature (SST) variability is the primary driver of seasonal O-18 variability in these Fiji corals, annual average coral O-18 is more closely correlated to sea surface salinity (SSS) as previously reported. Our results highlight the importance of water mass advection in controlling Fiji coral O-18 and salinity variability at interannual and decadal time scales despite being located in the heavy rainfall region of the South Pacific Convergence Zone (SPCZ). The Fiji O-18 composite presents a secular freshening and warming trend since the 1850s coupled with changes in both interannual (IA) and decadal/interdecadal (D/I) variance. The changes in IA and D/I variance suggest a re-organization of climatic variability in the SPCZ region beginning in the late 1800s to period of a more dominant interannual variability, which could correspond to a southeast expansion of the SPCZ.
%$ 032 ; 021