A 200-year coral stable oxygen isotope record from a high-latitude reef off western Australia
A 200-year coral stable oxygen isotope record from a high-latitude reef off western Australia
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DOI：
10.1007/s003380050147
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发表时间：
1999-04-01
期刊：
影响因子：
3.5
通讯作者：
Wefer, G
中科院分区：
文献类型：
--
作者：
Kuhnert, H;Pätzold, J;Wefer, G
对来自一个红滨珊瑚群的岩芯进行了稳定氧同位素组成分析。在南纬29度，Houtman Abrolhos是印度洋最南端的主要珊瑚礁群。它们位于Leeuwin海流的路径上，这是一股向南流动的温暖的热带水流，与印度尼西亚的通流相耦合。珊瑚三角洲（18）O主要反映了当地的海洋和气候变化，这在很大程度上是由Leeuwin电流的空间变化。然而，珊瑚三角洲（18）O和电流强度之间的相关性相对较弱。珊瑚三角洲（18）O的演变光谱和奇异光谱分析表明，随着时间的推移，光谱组成的变化很大。5-7年、14-15年和准两年波段的振荡反映了当地海表温度（SST）与热带太平洋气候变率的遥相关。本地（珊瑚）和区域（仪器）SST之间的偏差包含一个周期为15年的循环组件。珊瑚三角洲（18）O表明，自公元1944年以来，SST上升了0.6 'C，与现有的SST仪器记录一致。从珊瑚记录中推断，自公元1795年以来，长期变暖1.4摄氏度。
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 delta(18)O. At 29 degrees 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 delta(18)O primarily reflects local oceanographic and climatic variability, which is largely determined by spatial variability of the Leeuwin Current. However, coherence between coral delta(18)O and the current strength itself is relatively weak. Evolutionary spectral and singular spectrum analyses of coral delta(18)O 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 delta(18)O 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 degrees C since AD 1795 is inferred from the coral record.