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Interdecadal climate variability in the Coral Sea since 1708 A.D.

AutorCalvo, Eva María ; Marshall, John F.; Pelejero, Carles ; McCulloch, Malcom; Gagan, Michael K.; Lough, Janice M.
Palabras claveInterdecadal variability
Coral Sea
South Pacific
Interdecadal Pacific oscillation
Coral proxies
Fecha de publicaciónmay-2007
CitaciónPalaeogeography, Palaeoclimatology, Palaeoecology 248(1-2): 190-201 (2007)
ResumenLow resolution (5-year) Sr/Ca and δ18O samples, extending back to 1708 A.D., were analysed from a Porites coral core collected from Flinders Reef, an offshore reef on the Queensland Plateau in the western Coral Sea (17.5° S, 148.3° E). Using the Sr/Ca ratio as a proxy for sea surface temperature (SST), we deconvolved a salinity record by subtracting the SST signal from the δ18O record. Decadal variability in the reconstructed salinity record is closely paralleled by changes in SST, with cooler (warmer) temperatures recorded during wetter (drier) periods. This relationship differs from the conventional view often described for tropical areas, where warm temperatures are associated with wet periods and cool temperatures with dry periods. The anti-correlation between reconstructed SST and salinity observed at Flinders Reef, however, matches the climatic effects expected from variations in the Interdecadal Pacific Oscillation (IPO), a recurrent pattern of SST variability over the Pacific Ocean which is known to modulate Australia's climate, in particular the impact of ENSO events on decadal time scales. On longer timescales, salinity seems to have remained almost constant for the last two centuries after a progressive freshening of surface waters that culminated around 1800 A.D. Conversely, SSTs show a warming trend towards the late 20th century. © 2006 Elsevier B.V. All rights reserved
Descripción12 pages, 7 figures
Versión del editorhttp://dx.doi.org/10.1016/j.palaeo.2006.12.003
Identificadoresdoi: 10.1016/j.palaeo.2006.12.003
issn: 0031-0182
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