Abstract The response of benthic foraminifera (BF) and radiolarian production in the central Okhotsk Sea (OS) to orbital and millennial changes of climate and environment over the last 136 kyr have been studied on the basis of the sediment core PC-7R, with available productivity, geochemical and lithological records and a modified age model. We used the calculated accumulation rate of microfossils (AR, fluxes) of the main ecological groups and species indicative of radiolarians and of BF as quantity responses in their production, which is related to environmental and hydrological changes of the water column and surface sediment in the central OS and to global and regional climate changes. The responses of the opportunistic BF Alabaminella weddellensis and the suboxic group during the last 136 kyr were mostly related to changes in organic fluxes from the surface, sea ice cover and surface sediment oxygenation at both orbital and millennial time scales. The AR of radiolarians from the surface, dichothermal and mesopelagic groups significantly differed from the AR of BF. The AR has a maximum during the middle and late Marine Isotope Stage 5e and lower values during the earlier Holocene, while the minimum happened during cold Marine Isotope Stages 6, 4 and 2 with maximal ventilation of OS intermediate water. Production of the mesopelagic radiolarian Cycladophora davisiana in the OS was mostly related to the lateral delivery of terrigenous material and OM into the water column from the northwestern shelf and/or from the western subarctic Pacific. Due to the sensitivity of marine organisms to environmental conditions, the production of radiolarians and BF sharply changed with the extinction of Amphimelissa setosa, since Heinrich Stadial 8 is related to the termination of global environment cooling and the hydrology changes of the early last glacial.

中文翻译：

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从微古生物（放射虫和底栖有孔虫）、地球化学和岩性代理以及造成这些变化的机制推断的过去 136 kyr 中鄂霍次克海中部的轨道和千年尺度环境和水文变化

摘要 以沉积岩心 PC-7R 为基础，研究了鄂霍次克海中部 (OS) 底栖有孔虫 (BF) 和放射虫生产对过去 136 kyr 的轨道和千年气候和环境变化的响应。生产力、地球化学和岩性记录以及修正的年龄模型。我们使用计算的主要生态群和物种的微化石积累率（AR，通量）指示放射虫和高炉作为其生产中的数量响应，这与水体和表层沉积物的环境和水文变化有关。中央操作系统以及全球和区域气候变化。在过去的 136 kyr 期间，机会性 BF Alabaminella weddellensis 和低氧组的响应主要与轨道和千年时间尺度上来自地表、海冰覆盖和表层沉积物氧化的有机通量的变化有关。来自地表、二分温线和中远洋组的放射虫的 AR 与 BF 的 AR 显着不同。AR 在海洋同位素 5e 中后期达到最大值，而在全新世早期较低，而最小值出现在冷海洋同位素 6、4 和 2 阶段，OS 中间水的通风量最大。OS 中中层放射虫 Cycladophora davisiana 的产生主要与陆源物质和 OM 从西北大陆架和/或西亚北极太平洋向水体的侧向输送有关。由于海洋生物对环境条件的敏感性，随着海因里希斯塔迪尔8号海因里希斯塔迪尔8号与全球环境降温的终止和末次冰期早期的水文变化有关，放射虫和BF的产生随着山毛虫的灭绝发生了急剧的变化。