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Kuhnert, Henning; Pätzold, Jürgen; Hatcher, B G; Wyrwoll, K-H; Eisenhauer, Anton; Collins, L B; Zhu, Z R; Wefer, Gerold (1999): Stable oxygen isotope record from a high-latitude reef off Western Australia. PANGAEA,, Supplement to: Kuhnert, H et al. (1999): A 200-year coral stable oxygen isotope record from a high-latitude reef off Western Australia. Coral Reefs, 18(1), 1-12,

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A core from a coral colony of Porites lutea was analysed for stable oxygen isotopic composition*. A 200-year proxy record of sea surface temperatures from the Houtman Abrolhos Islands off west Australia was obtained from coral delta18O. At 29°S, the Houtman Abrolhos are the southernmost major reef complex of the Indian Ocean. They are located on the path of the Leeuwin Current, a southward flow of warm, tropical water, which is coupled to Indonesian throughflow. Coral delta18O primarily reflects local oceanographic and climatic variability, which is largely determined by spatial variability of the Leeuwin Current. However, coherence between coral delta18O and the current strength itself is relatively weak. Evolutionary spectral and singular spectrum analyses of coral delta18O demonstrate a high variability in spectral composition through time. Oscillations in the 5-7-y, 14-15-y, and quasi-biennial bands reflect teleconnections of local sea surface temperature (SST) to tropical Pacific climate variability. Deviations between local (coral-based) and regional (instrument) SST contain a cyclic component with a period of 15 y. Coral delta18O suggests a rise in SST by 0.6°C since AD 1944, consistent with available instrumental SST records. A long-term warming by 1.4°C since AD 1795 is inferred from the coral record.
Related to:
Kuhnert, Henning (1998): Aufzeichnug des Klimas vor Westaustralien in stabilen Isotopen in Korallenskeletten. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 117, 109 pp, urn:nbn:de:gbv:46-ep000102379
Latitude: -28.461667 * Longitude: 113.768333
Date/Time Start: 1994-01-01T00:00:00 * Date/Time End: 1994-01-01T00:00:00
Abrolhos * Latitude: -28.461667 * Longitude: 113.768333 * Date/Time: 1994-01-01T00:00:00 * Elevation: -5.0 m * Recovery: 3 m * Location: Houtman Abrolhos Islands, Wallabi Group * Campaign: Australia94 * Basis: Sampling/drilling corals * Method/Device: Drill, hydraulic (DRILLHY) * Comment: The coral locality is protected from the prevailing swell, but is exposed to rapid exchange of shelf-edge surface water via a deep (30 m) channel and an open boundary to the north. The shelf break is located approximately 36 km to the west.
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