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首页> 外文期刊>Oceanographic Literature Review >Orbital and millennial-scale environmental and hydrological changes of the central Okhotsk Sea over the last 136 kyr inferred from micropaleontological (radiolarian and benthic foraminifera), geochemical and lithological proxies and the mechanisms responsible for them
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Orbital and millennial-scale environmental and hydrological changes of the central Okhotsk Sea over the last 136 kyr inferred from micropaleontological (radiolarian and benthic foraminifera), geochemical and lithological proxies and the mechanisms responsible for them

机译：中央Okhotsk Sea的轨道和千禧年环境和水文变化，从微孔（放射性术和底栖菌），地球化学和岩性代理和负责它们的机制

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摘要

The response of benthic foraminifera (BF) and radiolarian pro-duction 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.
机译：在沉积物核心PC-7R的基础上，研究了鄂霍克海（OS）与轨道和环境中央和环境的轨道和环境变化的响应，在沉积物核心PC-7R可用的生产力，地球化学和岩性记录和修改的年龄模型。我们利用主要生态群体和物种的计算累积率和指示放射性的物种和BF作为其生产中的数量反应，这与水柱和表面沉积物的环境和水文变化有关中央操作系统和全球和区域气候变化。在过去136 ktr期间，机会化的BF阿拉巴米氏菌属韦德兰斯和中药组的反应主要与表面，海冰盖和表面沉积物氧合的有机助熔剂的变化有关，在轨道和千年期间尺度。从表面，Dichothermal和叶片内的AR的AR与BF的AR显着不同。在中期海洋同位素阶段5e和较早的全新世期间，AR在中期和晚期同位素阶段5e和较低的值，而在冷海洋同位素阶段6,4和2期间发生的最小值，具有MS中间水的最大通气。在OS中生产的中瓣放射性型环酰·达维亚氏菌大多数与人造物质的横向递送和来自西北部货架和/或西亚宫殿太平洋的水柱。由于海洋生物对环境条件的敏感性，随着AmphimeLissa Setosa的灭绝，辐射纤维和BF的产生急剧变化，因为Heinrich Stadial 8与全球环境冷却的终止和早期冰川早期的水文变化有关。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2158-2158|共1页
  • 作者

    S.A. Gorbarenko; E.A. Yanchenko; O.Y. Psheneva;

  • 作者单位

    V.I. Il'ichev Pacific Oceanological Institute Far Eastern Branch of the Russian Academy of Science Vladivostok Russian Federation;

    V.I. Il'ichev Pacific Oceanological Institute Far Eastern Branch of the Russian Academy of Science Vladivostok Russian Federation;

    V.I. Il'ichev Pacific Oceanological Institute Far Eastern Branch of the Russian Academy of Science Vladivostok Russian Federation;

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