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首页> 外文期刊>Journal of quaternary science: JQS >Reconstruction of oceanographic changes based on diatom records of the core MD012380 since Marine Isotopic Stage 11 in the Banda Sea
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Reconstruction of oceanographic changes based on diatom records of the core MD012380 since Marine Isotopic Stage 11 in the Banda Sea

机译：自班达海海洋同位素第11期以来的MD012380核心硅藻记录重建海洋学变化

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摘要

Current surface production in the Banda Sea is primarily controlled by monsoonal forcing, the strength of the Indonesian throughflow and surface salinity, and is sensitive to global climate changes. Therefore, variations of paleoproductivity represented by the abundance of diatoms are estimated to assist in understanding possible hydrological changes during glacial-interglacial cycles since Marine Isotopic Stage 11 (MIS 11). During the interglacials, the enhanced austral winter monsoon (southeast monsoon) encourages deepening of the mixed layer and uplifting of the thermocline, thereby increasing surface production. However, accompanied enhancement of the Indonesian throughflow (ITF) within the interglacials brings warm and less-saline water from the central part of the warm pool water entering the Banda Sea to mitigate development of the upwelling system. Conversely, cooling of the Northern Hemisphere forces the strengthening of the austral summer monsoon (northwest monsoon) to depress the upwelling and reduce production during glacial intervals, whereas the weakening flow of the ITF reduces the influence of low-salinity capping effects and benefits production. Higher abundance of Chaetoceros sp., dominant in upwelling environments, observed in glacials suggests that strength of the ITF is the most important factor in controlling the vertical thermostructure of the Banda Sea.
机译：班达海目前的地表生产主要受季风强迫，印度尼西亚通流强度和地表盐度控制，并且对全球气候变化敏感。因此，估计了由丰富的硅藻代表的古生产力的变化，以帮助理解自海洋同位素阶段11（MIS 11）以来的冰川间期循环期间可能的水文变化。在间冰期，增强的南方冬季季风（东南季风）促进了混合层的加深和温跃层的抬升，从而增加了地表产量。但是，随着间冰期间印尼通量（ITF）的提高，从温池水中央部分流入的温暖和盐度较低的水进入了班达海，以减轻上升流系统的发展。相反，北半球的降温迫使南半球夏季风（西北季风）加强，从而抑制了冰川间隔期间的上升流并减少了产量，而ITF流量的减弱则降低了低盐度上限效应的影响并有利于生产。在上升流环境中占主导地位的Chaetoceros sp。的较高丰度，在冰川中观察到，这表明ITF的强度是控制班达海垂直热结构的最重要因素。

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