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Atmospheric CO_2 concentration and millennial-scale climate change during the last glacial period

机译：上一个冰川期的大气CO_2浓度和千禧年尺度的气候变化

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The analysis of air bubbles trapped in polar ice has permitted the reconstruction of past atmospheric concentrations of CO_2 over various timescales, and revealed that large climate changes over tens of thousands of years are generally accompanied by changes in atmospheric CO_2 concentrations. But the extent to which such covariations occur for fast, millennial-scale climate shifts, such as the Dansgaard-Oeschger events recorded in Greenland ice cores during the last glacial period, is unresolved; CO_2 data from Greenland and Antarctic ice cores have been conflicting in this regard. More recent work suggests that Antarctic ice should provide a more reliable CO_2 record, as the higher dust content of Greenland ice can give rise to artefacts. To compare the rapid climate changes recorded in the Greenland ice with the global trends in atmospheric CO_2 concentrations as recorded in the Antarctic ice, an accurate common timescale is needed. Here we provide such a timescale for the last glacial period using the records of global atmospheric methane concentrations from both Greenland and Antarctic ice. We find that the atmospheric concentration of CO_2 generally varied little with Dansgaard-Oeschger events (< 10 parts per million by volume, p.p.m.v.) but varied significantly with Heinrich iceberg-discharge events (～20 p.p.m.v.), especially those starting with a long-lasting Dansgaard-Oeschger event.
机译：对被困在极地冰中的气泡的分析允许在不同的时间尺度上重建过去的大气CO_2浓度，并揭示了在几万年的大气候变化中通常伴随着大气CO_2浓度的变化。但是，这种协变在千禧年规模的快速气候变化中发生的程度，例如上一个冰期在格陵兰冰芯中记录的丹斯加德-厄施格事件，尚无法解决；在这方面，格陵兰和南极冰芯的CO_2数据一直存在冲突。最近的工作表明，南极冰应该提供更可靠的CO_2记录，因为格陵兰岛冰中较高的粉尘含量会引起人工制品。为了将格陵兰冰中记录的快速气候变化与南极冰中记录的全球大气CO_2浓度趋势进行比较，需要一个准确的共同时间尺度。在这里，我们使用格陵兰和南极冰的全球大气甲烷浓度的记录提供了上一个冰川期的时间尺度。我们发现，随着Dansgaard-Oeschger事件的发生，大气中的CO_2浓度变化很小（<百万分之十（体积），ppmv），但随着Heinrich冰山排放事件（〜20 ppmv）发生显着变化，特别是那些持续时间长的事件Dansgaard-Oeschger事件。

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