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首页> 外文期刊>Oceanographic Literature Review >A new perspective of the Alboran Upwelling System reconstruction during the Marine Isotope Stage 11: A high-resolution coccolithophore record
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A new perspective of the Alboran Upwelling System reconstruction during the Marine Isotope Stage 11: A high-resolution coccolithophore record

机译：海洋同位素阶段第11期瓦尔伯南升值系统重建的新视角：高分辨率Coccolthophore记录

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摘要

A high-resolution study of the MIS 12/MIS 11 transition and the MIS 11 (430-376 kyr) coccolithophore assemblages at Ocean Drilling Program Site 977 was conducted to reconstruct the palaeoceanographic and climatic changes in the Alboran Sea from the variability in surface water conditions. The nannofossil record was integrated with the planktonic oxygen and carbon stable isotopes, as well as the U~(37)~(k~') Sea Surface Temperature (SST) at the studied site during the investigated interval. The coccolithophore primary productivity, reconstructed from the PPP (primary productivity proxy = absolute values of Gephyrocapsa caribbeanica + small Gephyrocapsa group) revealed pronounced fluctuations, that were strongly associated with variations in the intensity of the regional Alboran Upwelling System. The comparison of the nannoplankton record with opal phytolith content for the studied site and the already available pollen record at the nearby Integrated Ocean Drilling Program Site U1385, suggests an association of the upwelling dynamics with the variability of the North Atlantic Oscillation-like (NAO-like) phase. High PPP during positive (+) NAO-like phases is the result of intensified upwelling, owing to the complete development of the surface hydrological structures at the Alboran Sea. This scenario was identified during the MIS 12/MIS 11 transition (428-422 kyr), the late MIS 1 lc (405-397 kyr), and MIS11 b to MIS 1 la (397-376 kyr). Two short-term minima in the PPP and SST were observed during MIS lib and were coeval with the North Atlantic Heinrich-type (Ht) events Ht3 (~390 kyr) and Ht2 (~384 kyr). Increased abundance of the subpolar Coccolithus pelagicus subsp. pelagicus and Gephyrocapsa muellerae was consistent with the inflow of cold surface waters into the Mediterranean Sea during the Ht events. Lowered PPP during negative (-) NAO-like phases is the result of moderate upwelling by the incomplete development of surface hydrological structures at the Alboran Sea. This scenario is expressed during the early MIS 1 lc (422-405 kyr). Overall, the results of our study provide evidence of the important role of atmospheric circulation patterns in the North Atlantic region for controlling phytoplankton primary production and oceanographic circulation dynamics in the Western Mediterranean during MIS 11.
机译：对MIS 12 / MIS 11过渡和MIS 11（430-376 Kyr）Coccolthophore在海洋钻井计划站点977的高分辨率研究进行了进行，以重建瓦尔伯南海中的古生馆和气候变化从地表水的变异使适应。 Nannofossil记录与浮游氧和碳稳定同位素相结合，以及在调查间隔期间在研究部位的U〜（37）〜（K〜'）海表面温度（SST）。从PPP重建的Coccolthophore初级生产率（初级生产力代理= Gephyrocapsa Caribbeanica +小Gephyrocapsa组的绝对值）显示出明显的波动，这与区域Alboran Uppwering System的强度的变化密切相关。与蛋白质植物植物含量的Nannoplankton含量的比较和附近的海洋钻探计划网站U1385​​的已有花粉录制表明，Uppelling Dynamics与北大西洋振荡的变异性（Nao-喜欢）阶段。阳性（+）型阶段的高PPP是加强升值的结果，由于瓦尔伯南海的表面水文结构完全发展。在MIS 12 / MIS 11转换期间（428-422 kyr），迟到的MIS 1 LC（405-397 Kyr）和MIS11 B（397-376 kyr）期间识别了这种情况。在MIS LIB期间观察到PPP和SST中的两个短期最小值，并与北大西洋海因里氏型（HT）HT3（〜390 kyr）和HT2（〜384 kyr）与北大西洋型型（HT）。增加了亚副群落的丰度。 Pelagicus和Gephyrocapsa Muellerae在HT事件期间与冷表面水流进入地中海的流入。阴性（ - ）Nao的阶段期间降低PPP是Alboran海的表面水文结构不完全发展的中度上升的结果。这种情况在早期MIS 1 LC（422-405 Kyr）期间表达。总体而言，我们的研究结果提供了北大西洋地区大气循环模式的重要作用，以控制在MIS 11期间西部地中海的浮游植物初级生产和海洋流通动态。

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