High Indian Native Kunhert

Core/Site name:

Houtman Abrolhos Islands, Wallabi Group

Country/Region:

Western Australia

Elevation:

-5

Archive:

corals

Species:

Porites lutea

Proxy measurement:

O18, C13

Sampling resolution:

seasonal

Climate sensitivity:

temperature, salinity

Dating resolution:

1/year

Dating information:

annual cycle count

Startyear:

1994 AD

Endyear:

1795 AD

All uncertainties:

Analytical error is 0.07permil for d18O and 0.05permil for d13C.Age model error estimated to be 1y per 100 y (due to unclear banding and d18O cycles near 1853 and 1869, respectively).

Description:

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.

Data entered by name:

Hali Kilbourne

Data entered by email:

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Main reference(s):

Kuhnert, Henning; Pätzold, Jürgen; Hatcher, B G; Wyrwoll, K-H; Eisenhauer, Anton; Collins, LB; Zhu, ZR; Wefer, Gerold (1999): A 200-year coral stable oxygen isotope record from a high-latitude reef off Western Australia. Coral Reefs, 18(1), 1-12Kuhnert, Henning (1998): Aufzeichnug des Klimas vor Westaustralien in stabilen Isotopen in Korallenskeletten. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 117, 109 pp

Link to reference 1:

http://www.springerlink.com/content/47w0rqv7ea49qjcv/

Link to reference 2:

http://nbn-resolving.de/urn:nbn:de:gbv:46-ep000102379

Data storage link 1:

http://doi.pangaea.de/10.1594/PANGAEA.730041

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k