Reef‐Scale‐Dependent Response of Massive Porites Corals From the Central Indian Ocean to Prolonged Thermal Stress: Evidence From Coral Sr/Ca Measurements
Reef‐Scale‐Dependent Response of Massive Porites Corals From the Central Indian Ocean to Prolonged Thermal Stress: Evidence From Coral Sr/Ca Measurements
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中印度洋大型滨珊瑚对长期热应力的 ReefâScaleâ 依赖性响应：来自珊瑚 Sr/Ca 测量的证据
DOI：
10.1029/2018gc007796
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发表时间：
2019
期刊：
影响因子：
3.7
通讯作者：
C. Sheppard
中科院分区：
文献类型：
--
作者：
Leupold;M. Pfeiffer;D. Garbe‐Schönberg;C. Sheppard
本文介绍了从查戈斯群岛（热带印度洋）两个不同珊瑚礁环境的活poritescorals中钻取的三个现代珊瑚芯的两周分辨率的珊瑚Sr/Ca数据。查戈斯群岛位于塞舌尔-查戈斯温跃层脊的东部边缘，以开阔的海洋上升流为特征。自2006年以来，温度记录仪记录了现场温度。高分辨率卫星温度密切跟踪记录器数据。两个岩心采集自Peros Banhos泻湖的斑礁，该地点具有高平均温度和低温变化的特征。在Diego Garcia外礁斜坡处收集了一个开放海洋岩芯，该岩芯经历了与开放海洋上升流相关的较大温度波动。开放的海洋核心在Sr/Ca中显示出明显的季节性循环，与卫星温度密切相关。两个礁湖珊瑚的Sr/Ca记录具有良好的重现性。在2007年到2010年间，Sr/Ca追踪卫星温度。然而，在2003年至2006年间，Sr/Ca曲线几乎是平坦的，珊瑚的年增长率很低。在这些年里，查戈斯观察到温暖的海面温度和珊瑚白化。观察到的珊瑚生长速度的下降很可能是对长期变暖事件的反应，这进一步证明了看似健康和存活的珊瑚受到热应力的影响。此外，两个潟湖岩心的Sr/Ca记录之间的高度相关性表明，这种影响不仅限于单个珊瑚群落，而且可能影响整个珊瑚礁环境。
Here we present coral Sr/Ca data of biweekly resolution from three modern coral cores drilled from livingPoritescorals from two different reef settings at Chagos (tropical Indian Ocean). Chagos lies at the eastern margin of the Seychelles‐Chagos thermocline ridge and features open ocean upwelling. In situ temperatures have been recorded by temperature loggers since 2006. High‐resolution satellite temperatures closely track the logger data. Two cores were collected from a patch reef in the lagoon of Peros Banhos, a site characterized by high mean temperatures and low‐temperature variability. An open ocean core was collected at the outer reef slope of Diego Garcia, which experiences larger temperature fluctuations related to open ocean upwelling. The open ocean core shows clear seasonal cycles in Sr/Ca that closely track the satellite temperatures. The Sr/Ca records from the two lagoon corals show good reproducibility. Between 2007 and 2010, Sr/Ca tracks satellite temperatures. However, between 2003 and 2006 the Sr/Ca curves are almost flat and annual coral growth rates are low. During these years, warm sea surface temperatures and coral bleaching have been observed at Chagos. It is likely that the observed reduction in coral growth rates is a response to prolonged warming events, adding to the growing evidence that seemingly healthy and surviving corals are affected by thermal stress. Further, the high correlation between the Sr/Ca records of the two lagoon cores suggests that this effect is not limited to single coral colonies but may affect the entire reef setting.
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