Three monthly coral Sr/Ca records from the Chagos Archipelago covering the period of 1950-1995 AD: reproducibility and implications for quantitative reconstructions of sea surface temperature variations
Three monthly coral Sr/Ca records from the Chagos Archipelago covering the period of 1950-1995 AD: reproducibility and implications for quantitative reconstructions of sea surface temperature variations
复制标题
DOI：
10.1007/s00531-008-0326-z
复制
发表时间：
2009-02-01
影响因子：
2.3
通讯作者：
Garbe-Schoenberg, Dieter
中科院分区：
文献类型：
--
作者：
Pfeiffer, Miriam;Dullo, Wolf-Christian;Garbe-Schoenberg, Dieter
为了评估珊瑚Sr/Ca对海洋表面温度变化定量重建的保真度，我们从Peros Banhos泻湖（东经71A度，南经5A度，查戈斯群岛）的Porites珊瑚中生成了三个月的Sr/Ca时间序列。我们发现这三个珊瑚的Sr/Ca时间序列与海表温度和气温的仪器记录具有良好的相关性。然而，单岩心Sr/Ca时间序列的内在方差因岩心而异，限制了它们用于定量估计过去温度变化的用途。对单岩心数据进行平均可以提高与仪器温度的相关性（r > 0.7），并可以准确估计年际温度变化（0.35℃或更高）。所有Sr/Ca时间序列都表明，在20世纪70年代中期，气温向更暖的方向转变，这与太平洋最近的气候变化相吻合。然而，从珊瑚Sr/Ca推断的变暖幅度在不同的岩芯之间存在差异，范围在0.26 ~ 0.75℃之间。Peros Banhos的Sr/Ca复合记录清楚地捕捉到了印度洋-太平洋的主要气候信号，即厄尔尼诺+/- o-南方涛动和太平洋年代际涛动。此外，复合Sr/Ca与热带平均温度高度相关（r = 0.7），表明热带印度洋珊瑚Sr/Ca时间序列将有助于热带平均温度的多代理重建。
In order to assess the fidelity of coral Sr/Ca for quantitative reconstructions of sea surface temperature variations, we have generated three monthly Sr/Ca time series from Porites corals from the lagoon of Peros Banhos (71A degrees E, 5A degrees S, Chagos Archipelago). We find that all three coral Sr/Ca time series are well correlated with instrumental records of sea surface temperature (SST) and air temperature. However, the intrinsic variance of the single-core Sr/Ca time series differs from core to core, limiting their use for quantitative estimates of past temperature variations. Averaging the single-core data improves the correlation with instrumental temperature (r > 0.7) and allows accurate estimates of interannual temperature variations (0.35A degrees C or better). All Sr/Ca time series indicate a shift towards warmer temperatures in the mid-1970s, which coincides with the most recent regime shift in the Pacific Ocean. However, the magnitude of the warming inferred from coral Sr/Ca differs from core to core and ranges from 0.26 to 0.75A degrees C. The composite Sr/Ca record from Peros Banhos clearly captures the major climatic signals in the Indo-Pacific Ocean, i.e. the El NiA +/- o-southern oscillation and the Pacific decadal oscillation. Moreover, composite Sr/Ca is highly correlated with tropical mean temperatures (r = 0.7), suggesting that coral Sr/Ca time series from the tropical Indian Ocean will contribute to multi-proxy reconstructions of tropical mean temperatures.