A coral Sr/Ca calibration and replication study of two massive corals from the Gulf of Mexico
A coral Sr/Ca calibration and replication study of two massive corals from the Gulf of Mexico
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DOI：
10.1016/j.palaeo.2011.05.005
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发表时间：
2011-07-01
影响因子：
3
通讯作者：
Quinn, Terrence M.
中科院分区：
文献类型：
--
作者：
DeLong, Kristine L.;Flannery, Jennifer A.;Quinn, Terrence M.
本研究探讨了在锶钙（Sr/Ca）的比例变化的两个大西洋珊瑚（Montastraea faveolata和Siderastrea siderea）从干龟国家公园（集中在24.7度N，82.8度W）在墨西哥湾。来自珊瑚群落的岩芯非常接近（105米），并且具有相同的环境条件（即，深度和水化学）进行了微取样，约每月的分辨率和所产生的Sr/Ca的变化与当地的海表温度（SST）记录进行了校准。珊瑚Sr/Ca变异的复制试验发现，群体内变异和S. siderea（一个单一的M. faveolata菌落取样）。珊瑚Sr/Ca和本地SST的月变化的回归分析显示显着的相关性在月度和年际时间尺度上。在不同时间尺度上的校准验证发现，珊瑚Sr/Ca-SST重建在S。siderea比M. faveolata，特别是在年际时间尺度上。两种物质的Sr/Ca-SST校准方程显着不同（参见，Sr/Ca = -0.042 SST + 10.070，S. Sr/Ca = -0.027 SST + 9.893，M. faveolata）。M的平均线性延伸。faveolata是S. Sidea（4.63、4.31和8.31 mm年（-1），A1、F1和B3）：然而，M. faveolata小于S.侧链脲（分别为0.323、0.353和0.254 mmol mol（-1），A1、F1和B3）。M的降低斜率。faveolata是由于物理采样问题与复杂的时间骨架结构的M。faveolata，即，抽样效应，而不是增长效应，因为增长较快的M。faveolata具有降低的Sr/Ca变异性。(C)2011 Elsevier B. V.保留所有权利。
This study examined the variations in the ratio of strontium-to-calcium (Sr/Ca) for two Atlantic corals (Montastraea faveolata and Siderastrea siderea) from the Dry Tortugas National Park (centered on 24.7 degrees N, 82.8 degrees W) in the Gulf of Mexico. Cores from coral colonies in close proximity (105 of meters) and with the same environmental conditions (i.e., depth and water chemistry) were micro-sampled with approximately monthly resolution and the resulting Sr/Ca variations were calibrated with local sea surface temperature (SST) records. Replication tests for coral Sr/Ca variations found high agreement between intra-colony variations and between individual colonies of S. siderea (a single M. faveolata colony was sampled). Regression analysis of monthly variations in coral Sr/Ca and local SST revealed significant correlation on monthly and inter-annual timescales. Verification of the calibration on different timescales found coral Sr/Ca-SST reconstructions in S. siderea were more accurate than those from M. faveolata, especially on inter-annual timescales. Sr/Ca-SST calibration equations for the two species are significantly different (cf., Sr/Ca = -0.042 SST + 10.070, S. siderea; Sr/Ca = -0.027 SST + 9.893, M. faveolata). Mean linear extension for M. faveolata is approximately twice that of S. siderea (4.63, 4.31, and 8.31 mm year(-1), A1, F1, and B3, respectively): however, seasonal Sr/Ca variability in M. faveolata is less than S. siderea (0.323, 0.353, and 0.254 mmol mol(-1), A1, F1, and B3, respectively). The reduced slope for M. faveolata is attributed to physical sampling issues associated with complex time-skeletal structure of M. faveolata, i.e., a sampling effect, and not a growth effect since the faster growing M. faveolata has the reduced Sr/Ca variability. (C) 2011 Elsevier B.V. All rights reserved.