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首页> 外文期刊>Journal of Asian earth sciences >Milankovitch-scale environmental variation in the Banda Sea over the past 820 ka: Fluctuation of the Indonesian Throughflow intensity
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Milankovitch-scale environmental variation in the Banda Sea over the past 820 ka: Fluctuation of the Indonesian Throughflow intensity

机译：过去820 ka班达海的Milankovitch尺度环境变化：印度尼西亚通流强度的波动

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We describe the environmental variation in the Banda Sea over the past 820 ka by using the magnetic parameters and oxygen isotope data from the core MD012380. Overall, characteristics of the magnetic parameters show simultaneous variation with marine isotope stage (MIS), especially in the last 420 ka. There are fewer, coarser and more oxidative magnetic minerals in glacial periods, and turn to opposite conditions in interglacial periods. Spectral results clearly present the Milankovitch periods over the last 820 ka, especially the eccentricity period (400-ka and 100-ka). However, the magnetic data shows different pattern before and after 420 ka. Thus, we segmented the time-series data into two periods: MIS 20 to MIS 12 and MIS 11 to MIS 1. During MIS 20 to MIS 12, the spectra of magnetic data show clear periods related to the obliquity (41-ka) and precession (23-ka and 19-ka), while they present only the eccentricity period (100-ka) during MIS 11 to MIS 1. This feature, which splits the late Pleistocene at around 420 ka, could be attributed to the mid-Brunhes event (MBE). In the Banda Sea, main factor controlling the variation of the magnetic minerals is considered as the fluctuation of the Indonesian Throughflow (ITF) intensity due to sea-level change. Thus, the magnetic data show clear 400-ka and 100-ka periods (main MIS cycle). Besides, the eccentricity signals are relatively dominant in the last ~420 ka, implying that the ITF might become more important after the MBE in the Banda Sea.
机译：我们使用MD012380核心的磁参数和氧同位素数据，描述了过去820 ka的班达海环境变化。总体而言，磁参数的特征显示出海洋同位素阶段（MIS）的同时变化，尤其是在最后420 ka。冰川期的磁性矿物质较少，较粗糙，而氧化性矿物质较多，而在冰川期则转向相反的条件。光谱结果清楚地显示了最近820 ka的Milankovitch周期，尤其是偏心周期（400-ka和100-ka）。但是，磁数据在420 ka之前和之后显示出不同的模式。因此，我们将时间序列数据分为两个周期：MIS 20到MIS 12和MIS 11到MIS1。在MIS 20到MIS 12期间，磁数据的频谱显示了与倾角（41-ka）和磁倾角有关的清晰周期。进动（23-ka和19-ka），而它们仅在MIS 11到MIS 1期间呈现偏心期（100-ka）。此特征将晚更新世分裂在420 ka左右，这可归因于早午餐事件（MBE）。在班达海，控制磁性矿物变化的主要因素被认为是由于海平面变化而引起的印尼通流强度的波动。因此，磁数据显示出清晰的400-ka和100-ka周期（主MIS周期）。此外，偏心率信号在最后约420 ka相对占主导地位，这意味着在班达海进行MBE之后，ITF可能会变得更加重要。

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