Much has been learned regarding orbital and millennial timescale climate changes after the onset of Northern Hemisphere glaciations (NHG) at ca. 2.7 Ma. By contrast, little is known about these variations before the NHG due to lack of high-resolution records. Here we report first millennial resolution quantified East Asian summer monsoon (EASM) precipitation record from the north eastern Tibetan Plateau. The record supports astronomical forcing of EASM during the late Miocene, except for the period of 8.13–8.03 Ma when EASM experienced high amplitude variations at the 100-, 20-kyr, and suborbital bands, which is in sharp contrast with the damped astronomical forcing. Detection of strong 100-kyr and millennial cycles during low eccentricity intervals of the warm late Miocene with ephemeral NH ice sheets cast doubt on NH ice sheet size variations as their exclusive forcing in the late Miocene and late Quaternary paleoclimatic records.

中文翻译：

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千禧年分辨率 晚中新世华北降水记录跨越未来的天文类比间隔

在北半球冰川期 (NHG) 开始后，关于轨道和千年时间尺度气候变化的知识已经很多。2.7 马。相比之下，由于缺乏高分辨率记录，人们对 NHG 之前的这些变化知之甚少。在这里，我们报告了青藏高原东北部的第一个千年分辨率量化东亚夏季风 (EASM) 降水记录。该记录支持中新世晚期 EASM 的天文强迫，但 8.13-8.03 Ma 期间 EASM 在 100-、20-kyr 和亚轨道带经历了高振幅变化，这与阻尼天文强迫形成鲜明对比.