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首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early-Middle Pleistocene Subseries boundary
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Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early-Middle Pleistocene Subseries boundary

机译：日本中部千叶复合段的海洋同位素第19阶段古跨越和古海洋记录：早期百良生植物界边界的关键参考

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Marine Isotope Stage (MIS) 19 is an important analogue for the present interglacial because of its similar orbital configuration, especially the phasing of the obliquity maximum to precession minimum. However, sedimentary records suitable for capturing both terrestrial and marine environmental changes are limited, and thus the climatic forcing mechanisms for MIS 19 are still largely unknown. The Chiba composite section, east-central Japanese archipelago, is a continuous and expanded marine sedimentary succession well suited to capture terrestrial and marine environmental changes through MIS 19. In this study, a detailed oxygen isotope chronology is established from late MIS 20 to early MIS 18, supported by a U-Pb zircon age and the presence of the Matuyama-Brunhes boundary. New pollen, marine microfossil, and planktonic foraminiferal delta O-18 and Mg/Ca paleotemperature records reveal the complex interplay of climatic influences. Our pollen data suggest that the duration of full interglacial conditions during MIS 19 extends from 785.0 to 775.1 ka (9.9 kyr), which offers an important natural baseline in predicting the duration of the present interglacial. A Younger Dryas-type cooling event is present during Termination IX, suggesting that such events are linked to this orbital configuration. Millennial- to multimillennial-scale variations in our delta O-18 and Mg/Ca records imply that the Subarctic Front fluctuated in the northwestern Pacific Ocean during late MIS 19, probably in response to East Asian winter monsoon variability. The climatic setting at this time appears to be related to less severe summer insolation minima at 65N and/or high winter insolation at 50N. Our records do not support a recently hypothesized direct coupling between variations in the geomagnetic field intensity and global/regional climate change. Our highly resolved paleoclimatic and paleoceanographic records, coupled with a well-defined Matuyama-Brunhes boundary (772.9 ka; duration 1.9 kyr
机译：海洋同位素阶段（MIS）19是本峡冰的重要类似物，因为其类似的轨道配置，尤其是倾斜度最大的序列最小值。然而，适合捕获陆地和海洋环境变化的沉积记录是有限的，因此MIS 19的气候强制迫使机制仍然很大程度上是未知数。千叶综合科，日本人群岛东部，是一种不断扩大的海洋沉积连续，适合通过MIS 19捕获陆地和海洋环境变化。在本研究中，从晚期MIS 20到早期MIS，将详细的氧同位素年表建立。 18，由U-PB锆石年龄和Matuyama-Brunhes边界的存在支持。新的花粉，海洋微泡沫和浮游植物的多氨酰胺δO-18和Mg / CA Paleotempers Regucts揭示了气候影响的复杂相互作用。我们的花粉数据表明，MIS 19期间完整的中间爆发条件的持续时间延伸到785.0至775.1 ka（9.9kyr），其提供了一种重要的自然基线，可以预测目前的中间夹层的持续时间。在终止IX期间存在较年轻的Dryas型冷却事件，表明这些事件与该轨道配置相关联。千禧一代的多国级别变化在我们的Delta O-18和MG / CA记录中意味着亚古地面在迟到的MIS 19期间在西北海洋波动，可能是为了应对东亚冬季季风变异性。此时的气候环境似乎与50N的65N和/或冬季冬季冬季缺失的较小夏季缺失最小值有关。我们的记录不支持最近假设地磁场强度和全球/区域气候变化之间的变化之间的直接耦合。我们高度解决的古模态和古生食品记录，与明确界定的Matuyama-Brunhes边界（772.9 ka;持续时间1.9 kyr

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