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The record for marine isotopic stage 11

机译:海洋同位素第11期的记录

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The marine isotopic stage 11 (MIS 11) is an extraordinarily long interglacial period in the Earth's history that occurred some 400,000 years ago and lasted for about 30,000 years. During this period there were weak, astronomically induced changes in the distribution of solar energy reaching the Earth. The conditions of this orbital climate forcing are similar to those of today's interglacial period1'2, and they rendered the climate susceptible to other forcing — for example, to changes in the level of atmospheric carbon dioxide. Here we use ice-core data from the Antarctic Vostok core to reconstruct a complete atmospheric carbon dioxide record for MIS 11. The record indicates that values for carbon dioxide throughout the interglacial period were close to the Earth's pre-industrial levels and that both solar energy and carbon dioxide may have helped to make MIS 11 exceptionally long. Anomalies in the oceanic carbonate system recorded in marine sediments at the time, for example while coral reefs were forming, apparently left no signature on atmospheric carbon dioxide concentrations.
机译:海洋同位素第11期(MIS 11)是地球历史上一个非常长的冰间期,发生在大约40万年前,历时约30,000年。在此期间,由天文学引起的微弱变化影响了到达地球的太阳能分布。这种轨道气候强迫的条件类似于今天的冰川期1'2,它们使气候容易受到其他强迫的影响,例如,大气二氧化碳水平的变化。在这里,我们使用来自南极Vostok核心的冰芯数据来重建MIS 11的完整大气二氧化碳记录。该记录表明,整个冰期之间的二氧化碳值都接近地球工业化前的水平,并且太阳能二氧化碳可能有助于使MIS 11异常长。当时在海洋沉积物中记录的海洋碳酸盐系统异常,例如在形成珊瑚礁的过程中,显然没有留下大气二氧化碳浓度的特征。

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