Twentieth century sea surface temperature and salinity variations at Timor inferred from paired coral δ18O and Sr/Ca measurements
Twentieth century sea surface temperature and salinity variations at Timor inferred from paired coral δ18O and Sr/Ca measurements
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DOI：
10.1002/2013jc009594
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发表时间：
2014-07-01
影响因子：
3.6
通讯作者：
Hetzinger, Steffen
中科院分区：
文献类型：
--
作者：
Cahyarini, Sri Yudawati;Pfeiffer, Miriam;Hetzinger, Steffen
印尼贯穿流(ITF)代表了连接太平洋暖池和印度洋的全球海洋环流，对印度洋-太平洋气候有很大的影响。自1990年代末以来，国际交易日基金使用系泊浮标进行监测，提供了关于季节和年际时间尺度的见解。然而，没有更长的记录限制了我们对它在过去一个世纪的演变的看法。在这里，我们介绍了位于ITF出口通道的帝汶岛的海表面温度(SST)和盐度(SSS)的替代记录，通过跨越1914-2004年期间的成对珊瑚三角洲O-18和锶/钙测量。这些基于上个世纪高分辨率代理的气候数据在解释印度尼西亚地区的古气候记录时突出了改进和警告。如果SST和SSS的季节性不是完全同步的，与仅基于珊瑚三角洲O-18的估算相比，珊瑚的锶/钙测温的应用改善了SST的重建。我们的记录也强调了除降雨外，海洋平流对该区域当地SSS的重要性。虽然厄尔尼诺/南方涛动(ENSO)引起的相对于印度洋偶极子(IOD)的异常较大，但东帝汶基于珊瑚的SST和SSS记录在年际时间尺度上与IOD有很强的相关性，而ENSO只修改了东帝汶SST。同样，东帝汶的SST和SSS与印度洋十年尺度的变化密切相关，这种变化似乎使东帝汶的海洋状况提前了大约1.6-2年。我们的研究为揭示印度洋-太平洋气候模式对ITF SST和SSS动力学的复杂特征提供了新的线索。
The Indonesian Throughflow (ITF), which represents the global ocean circulation connecting the Pacific Warm Pool to the Indian Ocean, strongly influences the Indo-Pacific climate. ITF monitoring since the late 1990s using mooring buoys have provided insights on seasonal and interannual time scales. However, the absence of longer records limits our perspective on its evolution over the past century. Here, we present sea surface temperature (SST) and salinity (SSS) proxy records from Timor Island located at the ITF exit passage via paired coral delta O-18 and Sr/Ca measurements spanning the period 1914-2004. These high-resolution proxy based climate data of the last century highlights improvements and cautions when interpreting paleoclimate records of the Indonesian region. If the seasonality of SST and SSS is not perfectly in phase, the application of coral Sr/Ca thermometry improves SST reconstructions compared to estimates based on coral delta O-18 only. Our records also underline the importance of ocean advection besides rainfall on local SSS in the region. Although the El Nino/Southern Oscillation (ENSO) causes larger anomalies relative to the Indian Ocean Dipole (IOD), Timor coral-based SST and SSS records robustly correlate with IOD on interannual time scales, whereas ENSO only modifies Timor SST. Similarly, Timor SST and SSS are strongly linked to Indian Ocean decadal-scale variations that appear to lead Timor oceanographic conditions by about 1.6-2 years. Our study sheds new light on the complex signatures of Indo-Pacific climate modes on SST and SSS dynamics of the ITF.