Examining water temperature proxies in Porites corals from the Great Barrier Reef:: a cross-shelf comparison
Examining water temperature proxies in Porites corals from the Great Barrier Reef:: a cross-shelf comparison
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DOI：
10.1007/s00338-003-0322-5
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发表时间：
2003-12-01
期刊：
影响因子：
3.5
通讯作者：
Alibert, C
中科院分区：
文献类型：
--
作者：
Fallon, SJ;McCulloch, MT;Alibert, C
珊瑚种Porites的殖民地的核心。收集从近岸，中间架，和外礁的地方（大堡礁中部），以测试的鲁棒性的主要元素的海表温度（SST）代理（B/Ca，Mg/Ca，Sr/Ca，U/Ca）的近岸过程的影响。Sr/Ca，U/Ca，B/Ca，Mg/Ca的时间序列分析相比，海表温度（SST），以提供这些元素的校准。这项研究表明，有显着的珊瑚之间的变化就一些代理。在某些情况下，对于单个U/Ca值，观察到类似于6 ℃的变化。这种变化幅度也见于Mg/Ca代用指标，在较小程度上见于B/Ca-SST关系。在两种珊瑚中，Mg/Ca和U/Ca都不遵循季节性信号。两种近岸珊瑚的Mg/Ca和U/Ca比值与近海珊瑚有显著差异（分别较低和较高）。其他两个代理（B/Ca和Sr/Ca）没有显示任何近岸与离岸的变化，除了一个近岸网站，没有一个明确的季节性信号，这些代理。Sr/Ca-SST关系是最稳健的，对于单个Sr/Ca值，温度变化接近2 ℃，这在该技术的误差范围内。
Cores from colonies of the coral species Porites sp. were collected from inshore, mid-shelf, and outer reef localities (central Great Barrier Reef) to test the robustness of the major elemental sea surface temperature (SST) proxies (B/Ca, Mg/Ca, Sr/Ca, U/Ca) to the influence of inshore processes. Time series analyses of Sr/Ca, U/Ca, B/Ca, and Mg/Ca are compared to sea surface temperature (SST) in order to provide calibrations for these elements. This study shows that there are significant variations between the corals with respect to some of the proxies. In some cases, variations of similar to6 degreesC are observed for a single U/Ca value. This magnitude of variation is also seen in the Mg/Ca proxy and, to a smaller extent, in the B/Ca-SST relationship. In two of the corals, both Mg/Ca and U/Ca do not follow a seasonal signal. The Mg/Ca and U/Ca ratios for two inshore corals are significantly different than the offshore corals (lower and higher, respectively). The other two proxies (B/Ca and Sr/Ca) do not display any inshore vs. offshore variations except for one inshore site that did not have a clear seasonal signal for either of these proxies. The Sr/Ca-SST relationship is the most robust, with a temperature variation of similar to2 degreesC for a single Sr/Ca value, which is within error for this technique.