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Evaluating the use of the massive coral Diploastrea heliopora for paleoclimate reconstruction

机译：评估大规模珊瑚Diploastrea heliopora在古气候重建中的使用

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摘要

To date, coral-based paleoclimate research in the Pacific has primarily utilized core samples from the genus Porites and has been most successful reconstructing past variability on interannual timescales, particularly the El Ni?o Southern Oscillation (ENSO). The Indo-Pacific coral genus Diploastrea, however, owing to its slower extension rate, denser structure, and longer lifespan, can potentially preserve geochemical proxy records 2–3 times longer than Porites cores of the same length. Before its potential can be realized, Diploastrea must first be calibrated and its climate signal assessed. We present oxygen isotope (δ18O) and Sr/Ca results from two Diploastrea cores collected in Fiji (16°49′S, 179°14′E) that allow for simultaneous evaluation of this coral's paleoclimatic utility and the reproducibility of each tracer at this site. Comparison to a Porites record from the same location allows for further evaluation of Diploastrea as a paleoclimatic archive. We demonstrate that Diploastrea's septal and columellar material yield similar δ18O-SST relationships and that despite some sacrifice of the seasonal δ18O amplitude, bulk sampling of either region is satisfactory for resolving interannual and lower frequency modes of climatic variability. Therefore paleoclimate reconstructions employing either a septal or columellar sampling regime of this genus may be useful at filling in spatial and temporal sampling gaps which currently hinder the reconstruction of long-term changes in major climate fields in the western Pacific.
机译：迄今为止，太平洋上基于珊瑚的古气候研究主要利用了Porites属的核心样本，并且最成功地重建了年际尺度上过去的变异性，尤其是厄尔尼诺南方涛动（ENSO）。但是，印度太平洋太平洋双足类属植物，由于其扩展速度较慢，结构更致密，寿命更长，因此其潜在的地球化学代用记录的保存时间可能是同等长度的多孔岩心的2-3倍。在发挥其潜能之前，必须先对Diploastrea进行校准并评估其气候信号。我们介绍了从斐济（16°49′S，179°14′E）收集的两个Diploastrea岩心的氧同位素（δ18O）和Sr / Ca结果，可同时评估该珊瑚的古气候效用和每个示踪剂在该温度下的可重复性现场。与来自相同位置的Porites记录进行比较可以进一步评估Diploastrea作为古气候档案。我们证明Diploastrea的中隔和柱状体材料产生相似的δ18O-SST关系，并且尽管牺牲了季节性δ18O振幅，但任一区域的整体采样对于解决年际和低频模式的气候变化是令人满意的。因此，采用该属的隔间或柱状采样方式的古气候重建可能在填补目前阻碍西太平洋主要气候场长期变化重建的时空采样空缺方面很有用。

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