Reproducibility of Clathromorphum compactum coralline algal Mg/Ca ratios and comparison to high-resolution sea surface temperature data
Reproducibility of Clathromorphum compactum coralline algal Mg/Ca ratios and comparison to high-resolution sea surface temperature data
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密形笼形珊瑚藻 Mg/Ca 比率的再现性以及与高分辨率海面温度数据的比较
DOI：
10.1016/j.gca.2017.09.044
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Steneck
中科院分区：
文献类型：
--
作者：
Hetzinger;Halfar;Steneck
结壳珊瑚藻类作为过去中高纬度海洋变异性的高分辨率档案的潜力直到最近才被认识到。在现场测量的表层海洋数据中，很少有珊瑚藻类替代物的比较，如依赖温度的藻类镁钙比，更罕见的是来自个别地点的良好复制记录。我们提供了来自北大西洋缅因湾一个单一地点的9个珊瑚藻类标本(致密克隆藻)的镁/钙记录。用激光消融-电感耦合等离子体质谱(LA-ICPMS)分析了来自藻丘的切片，得到了长达30年的单个镁/钙记录。我们首先测试了样本内和样本间的信号复制，并表明藻类的镁/钙比率在单个样本内的几个横断面上以及同一研究地点的不同样本之间是可重现的。此外，将LA-ICPMS得到的镁/钙比值与电子探针(EMP)分析的最长寿命样品的数据进行了比较，发现它们在统计上是可公度的。其次，我们评估了基于藻类的SST重建与环境温度数据之间的关系是否可以通过平均多个藻类样本的镁/钙记录(样本间平均值)来改善。我们发现，样本间平均值与海表面温度(SST)数据的关系比单独来自单个样本的镁/钙记录更强。因此，基于镁/钙的珊瑚藻类古温度重建可以受益于每个站点使用多个样本，并可以将温度代理精度从季节扩展到每月。
The potential of crustose coralline algae as high-resolution archives of past ocean variability in mid- to high-latitudes has only recently been recognized. Few comparisons of coralline algal proxies, such as temperature-dependent algal magnesium to calcium (Mg/Ca) ratios, within situ-measured surface ocean data exist, even rarer are well replicated records from individual sites. We present Mg/Ca records from nine coralline algal specimens (Clathromorphum compactum) from a single site in the Gulf of Maine, North Atlantic. Sections from algal mounds were analyzed using Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) yielding individual Mg/Ca records of up to 30 years in length. We first test intra- and intersample signal replication and show that algal Mg/Ca ratios are reproducible along several transects within individual sample specimens and between different samples from the same study site. In addition, LA-ICP-MS-derived Mg/Ca ratios are compared to electron microprobe (EMP) analyzed data on the longest-lived specimens and were found to be statistically commensurable. Second, we evaluate whether relationships between algal-based SST reconstructions andin situtemperature data can be improved by averaging Mg/Ca records from multiple algal specimens (intersample averages). We found that intersample averages yield stronger relationships to sea surface temperature (SST) data than Mg/Ca records derived from individual samples alone. Thus, Mg/Ca-based paleotemperature reconstructions from coralline algae can benefit from using multiple samples per site, and can expand temperature proxy precision from seasonal to monthly.
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影响因子：
5.8
作者：
Halfar, J.;Williams, B.;Wanamaker, A. D., Jr.
通讯作者：
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影响因子：
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作者：
J. Mallela;S. Hetzinger;J. Halfar
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影响因子：
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作者：
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通讯作者：
Hou A
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作者：
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通讯作者：
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评估北半球高纬度珊瑚藻 Clathromorphum 的多地点 δ18O 气候校准
影响因子：
5
作者：
J. Ng;B. Williams;D. Thompson;Chloe Mayne;J. Halfar;E. Edinger;K. Johnson
通讯作者：
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