A sea surface temperature reconstruction for the southern Indian Ocean trade wind belt from corals in Rodrigues Island (19° S, 63° E)
A sea surface temperature reconstruction for the southern Indian Ocean trade wind belt from corals in Rodrigues Island (19° S, 63° E)
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DOI：
10.5194/bg-13-5827-2016
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发表时间：
2016-10
期刊：
影响因子：
4.9
通讯作者：
J. Zinke;L. Reuning;M. Pfeiffer;J. Wassenburg;E. Hardman;Reshad Jhangeer-Khan;G. Davies;C. Ng;D. Kroon
中科院分区：
文献类型：
--
作者：
J. Zinke;L. Reuning;M. Pfeiffer;J. Wassenburg;E. Hardman;Reshad Jhangeer-Khan;G. Davies;C. Ng;D. Kroon
摘要。近几十年来，西印度洋迅速变暖，造成了更多的极端气候事件。因此，提高我们对印度洋海表温度（SST）变率、气候变化和热带珊瑚礁生态系统可持续性之间联系的认识至关重要。本文介绍了印度洋中南部信风带Rodrigues岛（63°E, 19°S）两个不同地点的月分解珊瑚Sr / Ca记录。基于Sr / Ca代理的线性关系，我们分别从1781年和1945年开始重建海温。本文分析了1945 - 2006年厄尔尼诺-南方涛动（ENSO）、副热带印度洋偶极子模态（SIOD）和太平洋年代际涛动（PDO）对长期海温观测与气候波动的关系。评估了Sr / Ca记录的可重复性，以及成岩作用和珊瑚取向对Sr / Ca - sst重建的潜在影响。我们使用原位SST和各种网格SST产品校准单个坚固的Sr / Ca记录。结果表明，Cabri海温记录提供了第一个记录1945年以来印度洋中南部PDO海温特征的印度洋珊瑚代用时间序列。我们认为，罗德里格斯岛的附加记录可以提供南印度洋信风带海温变化的良好记录，以揭示与SIOD/ENSO/PDO在更长的时间尺度上的远距联系。
Abstract. The western Indian Ocean has been warming rapidly over recent decades, causing a greater number of extreme climatic events. It is therefore of paramount importance to improve our understanding of links between Indian Ocean sea surface temperature (SST) variability, climate change and sustainability of tropical coral reef ecosystems. Here we present monthly resolved coral Sr ∕ Ca records from two different locations from Rodrigues Island (63° E, 19° S) in the south-central Indian Ocean trade wind belt. We reconstruct SST based on a linear relationship with the Sr ∕ Ca proxy with records starting from 1781 and 1945, respectively. We assess relationships between the observed long-term SST and climate fluctuations related to the El Nino–Southern Oscillation (ENSO), the Subtropical Indian Ocean Dipole Mode (SIOD) and the Pacific Decadal Oscillation (PDO) between 1945 and 2006, respectively. The reproducibility of the Sr ∕ Ca records is assessed as are the potential impacts of diagenesis and corallite orientation on Sr ∕ Ca–SST reconstructions. We calibrate individual robust Sr ∕ Ca records with in situ SST and various gridded SST products. The results show that the SST record from Cabri provides the first Indian Ocean coral proxy time series that records the SST signature of the PDO in the south-central Indian Ocean since 1945. We suggest that additional records from Rodrigues Island can provide excellent records of SST variations in the southern Indian Ocean trade wind belt to unravel teleconnections with the SIOD/ENSO/PDO on longer timescales.