Early mid-Holocene SST variability and surface-ocean water balance in the Southwest Pacific

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doi: 10.1029/2012PA002350
Author(s): Duprey, Nicolas; Lazareth, Claire E.; Corrège, T.; Le Cornec, F.; Maes, C.; Pujol, N.; Madeng-Yogo, M.; Caquineau, S.; Soares Derome, C.; Cabioch, Guy
Author Affiliation(s): Primary:
Centre National de la Recherche Scientifique, Institut de Recherche pour le Developpement France Nord, Talence, France
Other:
Université Bordeaux, France
Volume Title: Paleoceanography
Source: Paleoceanography, 27(4). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 73 refs.; illus., incl. 1 table, sketch maps
Summary: We present early mid-Holocene records of Sr/Ca, δ18O and δ18Osw 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, δ18O, and δ18Osw 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 δ18O 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 δ18O profile.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 24 Surficial Geology, Quaternary Geology; Absolute age; Alkaline earth metals; Anthozoa; Bivalvia; C-14; Calcium; Carbon; Cenozoic; Climate change; Climate forcing; Cnidaria; Dates; El Nino Southern Oscillation; Equatorial Pacific; Espiritu Santo; Geochemistry; Heterodonta; Holocene; Insolation; Intertropical convergence zone; Invertebrata; Isotope ratios; Isotopes; Leg 130; Melanesia; Metals; Middle Holocene; Modern analogs; Mollusca; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 806; Ocean Drilling Program; Ocean circulation; Oceania; Ontong Java Plateau; Orbital forcing; Oxygen; Pacific Ocean; Paleoclimatology; Porites; Quaternary; Radioactive isotopes; Salinity; Scleractinia; Sea water; Sea-surface temperature; South Pacific; Southern Pacific Convergence Zone; Southwest Pacific; Sr/Ca; Stable isotopes; Strontium; Surface water; Tridacna; Vanuatu; Veneroida; Water balance; West Pacific; Zoantharia
Coordinates: N001906 N001907 E1592142 E1592140
S154500 S150000 E1673000 E1670000
Record ID: 2014045484
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