Linsley B K, Wellington G M, Schrag D P
Department of Earth and Atmospheric Sciences, ES 351, University at Albany-State University of New York, Albany, NY 12222, USA.
Science. 2000 Nov 10;290(5494):1145-8. doi: 10.1126/science.290.5494.1145.
We present a 271-year record of Sr/Ca variability in a coral from Rarotonga in the South Pacific gyre. Calibration with monthly sea surface temperature (SST) from satellite and ship measurements made in a grid measuring 1 degrees by 1 degrees over the period from 1981 to 1997 indicates that this Sr/Ca record is an excellent proxy for SST. Comparison with SST from ship measurements made since 1950 in a grid measuring 5 degrees by 5 degrees also shows that the Sr/Ca data accurately record decadal changes in SST. The entire Sr/Ca record back to 1726 shows a distinct pattern of decadal variability, with repeated decadal and interdecadal SST regime shifts greater than 0. 75 degrees C. Comparison with decadal climate variability in the North Pacific, as represented by the Pacific Decadal Oscillation index (1900-1997), indicates that several of the largest decadal-scale SST variations at Rarotonga are coherent with SST regime shifts in the North Pacific. This hemispheric symmetry suggests that tropical forcing may be an important factor in at least some of the decadal variability observed in the Pacific Ocean.
我们展示了南太平洋环流中来自拉罗汤加岛的一块珊瑚的271年锶钙比变化记录。利用1981年至1997年期间在1度×1度网格上通过卫星和船舶测量得到的月海表面温度（SST）进行校准，结果表明该锶钙比记录是海表面温度的一个极佳替代指标。与1950年以来在5度×5度网格上通过船舶测量得到的海表面温度进行比较，也表明锶钙比数据准确记录了海表面温度的年代际变化。回溯至1726年的整个锶钙比记录显示出明显的年代际变化模式，出现了大于0.75摄氏度的重复年代际和年代际间海表面温度状态转变。与以太平洋年代际振荡指数（1900 - 1997年）表示的北太平洋年代际气候变化进行比较，表明拉罗汤加岛一些最大的年代际尺度海表面温度变化与北太平洋的海表面温度状态转变是一致的。这种半球对称性表明，热带强迫可能是太平洋观测到的至少部分年代际变化中的一个重要因素。
