Institute of Geology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria.
Department of Earth Sciences, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, MN 55455, USA.
Science. 2016 Jan 8;351(6269):165-8. doi: 10.1126/science.aad4132.
The driving force behind Quaternary glacial-interglacial cycles and much associated climate change is widely considered to be orbital forcing. However, previous versions of the iconic Devils Hole (Nevada) subaqueous calcite record exhibit shifts to interglacial values ~10,000 years before orbitally forced ice age terminations, and interglacial durations ~10,000 years longer than other estimates. Our measurements from Devils Hole 2 replicate virtually all aspects of the past 204,000 years of earlier records, except for the timing during terminations, and they lower the age of the record near Termination II by ~8000 years, removing both ~10,000-year anomalies. The shift to interglacial values now broadly coincides with the rise in boreal summer insolation, the marine termination, and the rise in atmospheric CO2, which is consistent with mechanisms ultimately tied to orbital forcing.
第四纪冰川-间冰期循环和与之相关的气候变化的主要驱动力被广泛认为是轨道强迫。然而，标志性的魔鬼洞（内华达州）亚水碳酸钙记录的先前版本显示，在轨道强迫的冰河时代结束之前，约 10000 年前就已经向间冰期转变，而且间冰期的持续时间比其他估计值长约 10000 年。我们对魔鬼洞 2 的测量结果几乎复制了过去 204000 年的所有记录，除了在结束时的时间，并且它们将记录在第二期结束时的年龄降低了约 8000 年，消除了两个约 10000 年的异常。向间冰期的转变现在与北方夏季太阳辐射的增加、海洋的结束以及大气中二氧化碳的增加大致相符，这与最终与轨道强迫有关的机制是一致的。
