High-resolution analyses of pollen and diatoms in core LV 53-29 from the northwestern Japan Sea trace climate, vegetation and oceanographic changes during the past 120 ka. The age model for the core was based on tephrochronology, colour lightness and magnetic susceptibility and was used to aid correlation with Dansgaard-Oeschger cycles (warm Greenland interstadials (GIs) and cold Greenland stadials (GSs)). The palynological and diatom data from this core record the changing influences of the East Asian monsoon, eustatic fluctuations in sea level, and the impact of variations in the direction and intensity of marine currents. Increases in Quercus and Cryptomeria pollen reflect GIs. The highest values of Cryptomeria were recorded during Marine Isotope Stage (MIS) 5 and were associated with an increase in the intensity of the summer monsoon. The increase in Larix pollen is an indicator of GSs, and it occurs in all marine isotopic stages. Changes in diatom records indicate that oceanographic conditions in the northwestern Japan Sea differed from its southern and eastern regions. An increase in the cold-water and polyhalobous Rhizosolenia hebetata indicates GIs, although the surface water temperatures were colder than today with normal salinity. Species of the genus Chaetoceros, which is characteristic of GSs, were abundant during MIS 2. The predominance of Chaetoceros taxa and the high total abundance of diatoms may reflect regional upwelling conditions. The absence of brackish-water species at this time indicates a slight freshening of the surface water. The study of pollen, spores and diatoms in sediments from the northwestern Japan Sea illustrates the great potential of these proxies for identifying abrupt climate oscillations preserved in high-temporal resolution marine records, particularly those related to interstadial and stadial conditions.

中文翻译：

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末次冰期周期中日本海西北部千禧年尺度的环境变化

日本西北部 LV 53-29 核心中花粉和硅藻的高分辨率分析追踪过去 120 ka 期间的气候、植被和海洋学变化。地核的年龄模型基于温度年代学、颜色亮度和磁化率，并用于帮助与丹斯加德-厄施格循环（温暖的格陵兰岛间地层 (GIs) 和寒冷的格陵兰岛间地层 (GSs)）相关联。来自该核心的孢粉学和硅藻数据记录了东亚季风的变化影响、海平面的海平面波动以及海流方向和强度变化的影响。Quercus和Cryptomeria花粉的增加反映了 GI。Cryptomeria的最高价值是在海洋同位素阶段 (MIS) 5 期间记录的，并且与夏季风强度的增加有关。落叶松花粉的增加是 GS 的一个指标，它发生在所有海洋同位素阶段。硅藻记录的变化表明日本海西北部的海洋条件与其南部和东部地区不同。尽管地表水温度比今天低且盐度正常，但冷水和多卤根红叶根霉的增加表明存在 GI。在 MIS 2 期间，毛角藻属的物种丰富，这是 GS 的特征。毛角藻属的优势分类群和硅藻的高总丰度可能反映了区域上升流条件。此时没有微咸水物种表明地表水略有清新。对日本海西北部沉积物中花粉、孢子和硅藻的研究表明，这些替代物在识别保存在高时间分辨率海洋记录中的突然气候振荡方面具有巨大潜力，特别是与间质和静态条件相关的那些。