High-resolution carbon dioxide concentration record 650,000-800,000 years before present
High-resolution carbon dioxide concentration record 650,000-800,000 years before present
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DOI：
10.1038/nature06949
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发表时间：
2008-05-15
期刊：
影响因子：
64.8
通讯作者：
Stocker, Thomas F.
中科院分区：
文献类型：
--
作者：
Luethi, Dieter;Le Floch, Martine;Stocker, Thomas F.
过去大气中二氧化碳浓度的变化可以通过测量被困在南极冰芯中的空气成分来确定。到目前为止，南极Vostok和EPICA Dome C冰芯提供了过去65万年大气二氧化碳水平的综合记录（1-4）。在这里，我们介绍了Dome C冰芯最低200米的结果，将大气二氧化碳浓度的记录延长了两个完整的冰川旋回，直至距今80万年。根据以前发表的资料（1-8）和目前的工作，我们发现大气二氧化碳在整个8个冰期旋回与南极温度密切相关，但在距今65万年至75万年之间浓度显著降低。在海洋同位素第16阶段的3000年期间，二氧化碳浓度低于180百万分之一体积（p.p.m.v），这可能反映了更明显的海洋碳储存。我们报告了在冰芯中测量到的最低二氧化碳浓度，这将晚第四纪二氧化碳浓度的工业化前范围扩大了约10 p.m v至172-300 p.m v。
Changes in past atmospheric carbon dioxide concentrations can be determined by measuring the composition of air trapped in ice cores from Antarctica. So far, the Antarctic Vostok and EPICA Dome C ice cores have provided a composite record of atmospheric carbon dioxide levels over the past 650,000 years(1-4). Here we present results of the lowest 200m of the Dome C ice core, extending the record of atmospheric carbon dioxide concentration by two complete glacial cycles to 800,000 yr before present. From previously published data(1-8) and the present work, we find that atmospheric carbon dioxide is strongly correlated with Antarctic temperature throughout eight glacial cycles but with significantly lower concentrations between 650,000 and 750,000 yr before present. Carbon dioxide levels are below 180 parts per million by volume ( p. p. m. v.) for a period of 3,000 yr during Marine Isotope Stage 16, possibly reflecting more pronounced oceanic carbon storage. We report the lowest carbon dioxide concentration measured in an ice core, which extends the pre-industrial range of carbon dioxide concentrations during the late Quaternary by about 10 p. p. m. v. to 172-300 p. p. m. v.