Variability and mechanisms of biological pump and organic carbon burial in the western Pacific marginal seas since the last glaciation

Abstract

海洋生物泵在调节大气—海洋系统中二氧化碳(CO2)的分配中发挥重要作用。但是到目前为止,人类对海洋生物泵的自然演变规律及其调控机制的认知尚存较大争议。本研究对冲绳海槽区输出生产力进行重建,获得过去9万年以来的高分辨率沉积记录。进一步通过数据集成,我们发现整个北太平洋中-高纬度海区输出生产力在末次冰期千年快速气候变化中呈现同步变化规律:即在北半球冷事件(例如Heinrich事件)对应较低的输出生产力,而暖事件对应较高的输出生产力。基于此,我们提出大气铁沉降不是该海区生物泵的主控因子。结合北太平洋与北大西洋气候变化遥相关机制,我们提出北太平洋输出生产力受控于北太平洋中层水演化,作用机制如下:在北半...Mechanisms controlling the export production during the last glaciation in the North Pacific remain controversial. Here, we present a record of 92,000-year export productivity (EP), inferred from sedimentary reactive phosphorus, from the western subtropical North Pacific. On millennial timescale EP decreased during cold stadials when dust supply was high in the northern hemisphere; and vice versa ...学位:博士后院系专业:海洋与地球学院_海洋化学学号:201517000

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