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首页> 外文期刊>Paleoceanography >A modern Sr/Ca-delta O-18-sea surface temperature calibration for Isopora corals on the Great Barrier Reef
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A modern Sr/Ca-delta O-18-sea surface temperature calibration for Isopora corals on the Great Barrier Reef

机译：在大堡礁上的Isopora珊瑚的现代SR / CA-DELTA O-18海面温度校准

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摘要

Isopora (Acroporidae) is a genus of often encrusting, branching to submassive corals that are common in many shallow habitats on modern and fossil Indo-West Pacific reefs. Although abundant, Isopora is largely absent from paleoceanographic literature. The scarcity of large Porites and the abundance of Isopora retrieved from the Great Barrier Reef (GBR) on Integrated Ocean Drilling Program Expedition 325 focused paleoceanographic attention on Isopora. Here we provide the first independent high-resolution calibration of both Sr/Ca and delta O-18 for temperature analyses based on Isopora and demonstrate its consistency with Porites records. We developed modern skeletal Sr/Ca- and delta O-18-sea surface temperature (SST) calibrations based on five modern Isopora colonies from Heron Island in the southern GBR. Pairing the coral Sr/Ca record with monthly SST data yielded Sr/Ca-SST sensitivities from -0.061 +/- 0.004 (centered) to -0.083 +/- 0.007 (raw) mmol/mol degrees C-1 based on reduced major axis regressions. These sensitivities are in the middle of the range of published Porites values and overlap most published values for Isopora, -0.075 +/- 0.011 to -0.065 +/- 0.011 mmol/mol degrees C-1 . The delta O-18-SST sensitivities range from -0.184 +/- 0.014 (centered) to -0185 +/- 0.014 (raw) parts per thousand degrees C-1 , assuming that all seasonal variation in delta O-18 was due to SST. These delta O-18-SST sensitivities are smaller than the widely accepted value of -0.23 parts per thousand degrees C-1 for biogenic aragonite but are at the upper end of high-resolution Porites-defined sensitivities that are consistently less than the aforementioned established value. Our results validate the use of Isopora as an alternative source of paleoceanographic records in habitats where large massive Porites are scarce or absent.
机译：Isopora（Acroporidae）是一个经常结垢的属，分支为亚大型珊瑚，常见于现代和化石印度-西太平洋珊瑚礁上的许多浅层栖息地。虽然等容线丰富，但在古海洋学文献中基本上没有。在综合海洋钻探计划第325次远征中，从大堡礁（GBR）获得的大型多孔岩的稀缺性和等孔菌的丰富性使古海洋学的注意力集中在等孔菌上。在这里，我们提供了第一个基于等容线的温度分析用Sr/Ca和delta O-18的独立高分辨率校准，并证明其与多孔记录的一致性。我们开发了现代骨骼Sr/Ca-和δO-18-海表面温度（SST）校准，基于来自GBR南部Heron岛的五个现代等容虫群落。根据减少的长轴回归，将珊瑚Sr/Ca记录与每月SST数据配对，得出Sr/Ca SST敏感性从-0.061+/-0.004（居中）到-0.083+/-0.007（原始）mmol/mol°C-1。这些灵敏度在公布的孔隙度值的范围内，并且与Isopora、-0.075±0.011～-0.065±/ 0.011 mmol/mol度C-1的大多数公布值重叠。假设delta O-18的所有季节性变化都是由SST引起的，那么delta O-18-SST的灵敏度范围为每千摄氏度-0.184+/-0.014（居中）到-0185+/-0.014（原始）部分。这些δO-18-SST灵敏度小于生物成因文石的-0.23份/1000摄氏度-1的广泛接受值，但处于高分辨率多孔岩定义的灵敏度的上限，该灵敏度始终小于上述确定值。我们的研究结果验证了在大型多孔岩稀少或不存在的栖息地，使用等孔菌作为古海洋记录的替代来源。

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  • 来源
    《Paleoceanography》 |2017年第2期|共13页
  • 作者

    Brenner Logan D.; Linsley Braddock K.; Potts Donald C.;

  • 作者单位

    Columbia Univ Dept Earth &

    Environm Sci New York NY 10027 USA;

    Lamont Doherty Earth Observ Palisades NY 10964 USA;

    Univ Calif Santa Cruz Dept Ecol &

    Evolutionary Biol Santa Cruz CA 95064 USA;

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  • 正文语种 eng
  • 中图分类 海洋学;
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