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The mid-Pleistocene transition in the subtropical southwest Pacific

机译：亚热带西南太平洋的中更新世过渡

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摘要

Reconstructions of subtropical southwest Pacific climate variability over the Pleistocene were derived from coupled planktic foraminiferal δ18O-Mg/Ca measurements taken from a southern Coral Sea sediment core. A clear shift from ～40 kyr to ～100 kyr modes of reconstructed glacial-interglacial sea surface temperature (SST) variability is seen over the mid-Pleistocene transition, and these fluctuations are shown to have remained coherent with the orbital obliquity cycle across the transition. The likely origin of this strong obliquity signal in subtropical southwest Pacific SST is shown to be the southern high latitudes, and comparison with existing SST reconstructions from the equatorial Pacific is consistent with the communication of the signal occurring principally by greenhouse gas forcing. In contrast to the SST reconstruction, regional hydrological cycle variability (based on the calculated local component of δ18Osw change) does not show significant coherence with obliquity after ～1000 ka. The decoupling of the SST and hydrological cycle responses over the mid-Pleistocene transition allows constraints to be placed on the evolution and extent of orbitally paced fluctuations within the coupled low-latitude ocean-atmosphere system.
机译：对更新世的西南亚热带西南太平洋气候变异性的重建来自对南部珊瑚海沉积物核心的板状有孔虫的δ18O-Mg/ Ca耦合测量。在中更新世过渡期间，重构的冰川-冰河间海面温度（SST）变异性从〜40 kyr明显转变为〜100 kyr模式，并且这些波动显示与过渡期间的轨道倾角周期保持一致。该强倾角信号可能在亚热带西南太平洋海表温度的起源是南部高纬度，并且与赤道太平洋现有海表温度重建的比较与主要通过温室气体强迫发生的信号通信相一致。与SST重建相比，区域水文循环变化（基于δ18Osw变化的计算局部分量）在〜1000 ka之后与倾角没有显着的一致性。在更新世中期过渡期间，海表温度和水文循环响应的解耦使得对耦合的低纬海洋-大气系统内轨道起伏波动的演化和程度施加了限制。

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