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CORALS AND SCLEROSPONGES

St. Gilles Reef - Oxygen Isotope Data
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Pfeiffer, M., O. Timm, W.-C. Dullo, and S. Podlech. 2004. Oceanic forcing of interannual and multidecadal climate variability in the southwestern Indian Ocean: Evidence from a 160 year coral isotopic record (La Réunion, 55E, 21S). Paleoceanography 19:PA4006.
Data Coverage North: -21.03 * South: -21.03
West: 55.25 * East: 55.25
Altitude: -12 m

Start Year: 1832 AD   End Year: 1995 AD

Data:     Please Cite Data Contributors!
  indian_ocean/reunion2004.txt

Summary:

We have developed a new 163-year bimonthly coral d18O record from La Réunion (55°E, 21°S). Interannual variations in coral d18O are coherent with the Southern Oscillation Index but not with regional sea surface temperature (SST). Correlations with the global SST field suggest more negative seawater d18O (d18Osw) during La Niña years. We propose that the signal results from changes in the strength of the South Equatorial Current and the Indonesian throughflow, which carry low salinity water. Multidecadal variations in coral d18O are coherent with regional SST, but the sign is of opposite sense as expected from the coral d18O-temperature relationship. This requires multidecadal changes in salinity large enough to overprint the SST contribution in the coral d18O record. Our results suggest that multidecadal salinity variations result from modulations in the transport of the South Equatorial Current, which varies in response to the surface wind field and/or the Indonesian throughflow.
More Info on Corals and Sclerosponges

Parameters:

del18O

Complete XML Record:

noaa-coral-1890  (Last Revised: 2008-06-19 )


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