The effect of sea surface properties on shell morphology and size of the planktonic foraminifer Neogloboquadrina pachyderma in the North Atlantic
The effect of sea surface properties on shell morphology and size of the planktonic foraminifer Neogloboquadrina pachyderma in the North Atlantic
复制标题
海面特性对北大西洋浮游有孔虫 Neogloboquadrina pchyderma 贝壳形态和大小的影响
DOI：
10.1016/j.palaeo.2011.08.014
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Kučera
中科院分区：
文献类型：
--
作者：
Moller;Schulz;Kučera
在整个北方大西洋最近的33个表层沉积物样品中，对极地浮游有孔虫Neogloboquadrina pachyderma的壳的大小和形状的变化进行了量化，并与周围表层沃茨的性质进行了相关。这项研究的目的是确定是否有任何形态特征可用于重建北大西洋极地地区的海面特性，大多数古温度代理似乎失败了。分析表明，壳形态是只有弱控制的栖息地特性，而壳的大小表现出很强的相关性与海面温度。平均贝壳尺寸对海表温度的回归揭示了存在两种趋势的左旋盘绕贝壳：一个连续的增加，壳的大小随着SST的下降，沉积在极地水团和壳的大小随着SST的增加，从过渡沃茨样品的连续增加。第二种趋势反映了观察到的右旋卷曲壳的趋势，这在相同的样品中很常见，并表明存在N。在温带样品中的左旋和右旋标本之间相同的平均壳大小趋势证实了早期遗传研究的结果，该研究表明在N中存在小但明显比例的相反卷曲。incompta，温带样品中的左旋贝壳可以归因于此。在极地区域（夏季SST < 9 °C），平均贝壳尺寸与海面温度之间的线性相关性已被用来开发一个经验公式，用于根据化石样本中的贝壳尺寸重建过去的海面温度。线性回归的残差的标准误差为2.36 °C（1 sigma），这意味着比大多数古温度计的误差大得多，但足够精确，可以在极地区域的各个古温度计的结果之间进行分辨。由此产生的回归模型已被应用于两个沉积物芯跨越的间隔从末次盛冰期（LGM）到今天。从核心PS1906-1的结果是一致的无冰条件下，在末次冰期在挪威海。最后，本文用N.厚皮壳的大小相似或略高于最新全新世。结果并不表明异常高的SST在冰期和LGM的重建，因此似乎更符合有孔虫转换函数和地球化学指标的结果。这两个沉积物芯显示最高的重建SST在全新世早期日照最佳。
The variability in size and shape of shells of the polar planktonic foraminiferNeogloboquadrina pachydermahave been quantified in 33 recent surface sediment samples throughout the northern Atlantic Ocean and correlated with the properties of the ambient surface waters. The aim of the study was to determine whether any of the morphological features could be used to reconstruct sea surface properties in the polar realm of the North Atlantic, where most paleotemperature proxies appear to fail. The analyses revealed that shell morphology is only weakly controlled by habitat properties, whereas shell size showed a strong correlation with sea surface temperature. The regression of mean shell size on sea surface temperature revealed the presence of two trends among the sinistrally coiled shells: a continuous increase in shell size with decreasing SST in sediments deposited under polar water masses and a continuous increase in shell size with increasing SST in samples from transitional waters. The second trend mirrors the trend observed for dextrally coiled shells, which are frequent in the same samples and signal the presence ofN. incompta.The identical mean shell size trends among the sinistral and dextral specimens in the temperate samples confirms the results of earlier genetic studies which indicated the existence of a small but distinct proportion of opposite coiling inN. incompta, to which the sinistral shells in the temperate samples could be attributed. The linear correlation between mean shell size and sea surface temperature in the polar domain (summer SST < 9 °C) has been used to develop an empirical formula for the reconstruction of past sea surface temperatures from shell sizes in fossil samples. The standard error of the residuals of the linear regression is 2.36 °C (1 sigma), which implies a much larger error than for most paleothermometers, but enough precision to allow resolution between results by individual paleothermometers in the polar domain. The resulting regression model has been applied on two sediment cores spanning the interval from the Last Glacial Maximum (LGM) to the present day. The results from core PS1906-1 are consistent with ice-free conditions during the LGM in the Norwegian Sea. The SST estimates for the LGM inferred fromN. pachydermashell size are similar or slightly higher than those for the latest Holocene. The results do not indicate anomalously high SST during the glacial and the LGM reconstructions thus appear more consistent with the results from foraminiferal transfer functions and geochemical proxies. Both sediment cores show the highest reconstructed SST during the early Holocene insolation optimum.
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