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Dassié E. P., Linsley B. K., Correge T., Wu H. C., Lemley G. M., Howe S., Cabioch Guy. (2014). 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. Paleoceanography, 29 (12), 1196-1213. ISSN 0883-8305

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Lien direct chez l'éditeur doi:10.1002/2013pa002591

Titre
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
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000348536600006
AuteursDassié E. P., Linsley B. K., Correge T., Wu H. C., Lemley G. M., Howe S., Cabioch Guy.
SourcePaleoceanography, 2014, 29 (12), p. 1196-1213. ISSN 0883-8305
RésuméThe 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.
Plan de classementLimnologie physique / Océanographie physique [032] ; Sciences du milieu [021]
Descr. géo.PACIFIQUE SUD ; FIJI ARCHIPEL
LocalisationFonds IRD [F B010063715]
Identifiant IRDfdi:010063715
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010063715

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